AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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HYBRID-HIGH RELIABILITY
DC-DC CONVERTER
PD-94541E
AHF SERIES
28V Input, Single/Dual Output
 
Description
The AHF Series of DC-DC converters feature single or dual
outputs over the full military temperature range. No derating
in output power is required, making them suitable for use in
rugged military applications. The low profile, small outline
package is ideally suited to the tight board space require-
ments of many industrial and aerospace applications.
Designed for nominal 28Vdc inputs, this family of converters
will meet the requirements of MIL-STD-704D. The basic cir-
cuit utilizes a pulse width modulated, feed-forward topology
at a nominal switching frequency of 550KHz. Input to output
isolation is achieved through the use of transformers in the
forward and feedback circuits.
The proprietary magnetic feedback circuit provides for an
extremely wide bandwidth control loop with a high phase
margin. The closed loop frequency response of this converter
family extends to approximately 50kHz, resulting in superior
line and load transient characteristics. This feedback method
is also inherently temperature and radiation insensitive. This
gives the AHF Series an important advantage over convert-
ers that incorporate opto-couplers in their design.
Manufactured in a facility fully qualified to MIL-PRF-38534,
these converters are fabricated utilizing DLA qualified process.
For available screening options, refer to device screening
table in the data sheet. Variations are electrical, mechanical
and screening can be accommodated.
Extensive computer simulation using complex modeling
enables rapid design modification to be provided. Contact IR
HiRel San Jose with specific requirements.
AHF
Features
16V to 40VDC Input Range (28VDC Nominal)
 Single and Dual Outputs
12W Output Power
 22.8W/in3 Power Density
 Low Input / Output Noise
(50mA / 60mVP-P max. respectively)
 Indefinite Short Circuit and Overload Protection
 Wideband Control Loop for Superior Transient
Characteristics
 No derating for -55°C to +125°C Operation
Constant Switching Frequency
(550kHz Nominal)
 Standard Microcircuit Drawings Available
1 2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Specifications
Absolute Maximum Ratings
Input Voltage
Soldering temperature
Operating case temperature
Storage case temperature
 
-0.5Vdc to +50VDC
+300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Table I. Electrical Performance Characteristics
AHF2803R3S
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Min Max
Unit
Output voltage
Output current1
VOUT IOUT = 5% of rated load
IOUT VIN = 16, 28, and 40Vdc
1
2,3
1,2,3
3.26 3.34
01 3.23 3.36 V
01 3030 mA
Output power
POUT VIN = 16, 28, and 40Vdc
1,2,3
01
10 W
Output ripple voltage2
Line regulation
Load regulation
Input current
Input ripple current2
VRIP
VRLINE
VRLOAD
IIN
IRIP
VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
VIN = 16, 28, and 40Vdc,
IOUT = 5%, 50% and 100%
rated load
VIN = 16, 28, and 40Vdc,
IOUT = 5%, 50% and 100%
rated load
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7)
IOUT = 0,
Inhibit (Pin 1) = open
IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
1,2,3
1,2,3
01
01
01
1,2,3
01
1,2,3
01
60 mVp-p
25 mV
50 mV
12
mA
30
50 mAp-p
Efficiency
Isolation
Capacitive load3,4
Power dissipation
load fault
EFF IOUT = 100% rated load
Input to output or any pin
ISO to case (except Pin 6) at
500Vdc TC = +25°C
CL
No effect on dc performance,
TC = +25°C
PD Overload 5
Short circuit
1
2,3
1
4
1
1,2,3
01 70
68
01 100
%
M
01 500 µF
01 6.0 W
01 2.0
Switching frequency
FS IOUT = 100% rated load
4,5,6
01 500 600 kHz
For Notes to Electrical Performance Characteristics, refer to page 3
2 2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Table I. Electrical Performance Characteristics (continued)
Parameter
Output response to
step transient load
changes6
Recovery time step
transient load
changes6.7
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
VOTLOAD
50% to/from 100% rated
load
5% to/from 50% rated load
4,5,6
4,5,6
TTLOAD
50% to/from 100% rated
load
4,5,6
5% to 50% rated load
4,5,6
Output response to
transient step line
changes
Recovery time
transient step line
changes
Turn on overshoot
Turn on delay
50% to 5% rated load
VOTLINE
TTLINE
VTonOS
TonD
Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 8
Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 7, 8
IOUT = 5 and 100% rated
load
IOUT = 5 and 100% rated
load 9
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
Load fault recovery4,9
Weight
TrLF
4,5,6
Device
Types
01
01
01
01
01
01
01
AHF2803R3S  
Limits
Min Max
Unit
-300 +300
-500 +500
mVpk
70 µs
1200
8.0
µs
ms
500 mVpk
800 µs
600 mVpk
20 ms
20 ms
38 g
Notes to Table I:
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
4. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table I.
5. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short
circuit protection and is the condition of maximum power dissipation.
6. Load step transition time between 2 and 10 microseconds.
7. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT
at 50 percent load.
8. Input step transition time between 2 and 10 microseconds.
9. Turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal
from the Inhibit Pin (Pin 1) while power is applied to the input is unlimited.
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HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Specifications
Absolute Maximum Ratings
Input Voltage
Soldering temperature
Operating case temperature
Storage case temperature
 
-0.5Vdc to +50VDC
+300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Table II. Electrical Performance Characteristics
AHF2805S
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Min Max
Unit
Output voltage
Output current1
VOUT
IOUT = 0
IOUT VIN = 16, 28, and 40Vdc
1
2,3
1,2,3
4.95 5.05
01 4.90 5.10 V
01 2400 mA
Output power
POUT VIN = 16, 28, and 40Vdc
1,2,3
01
12 W
Output ripple voltage2
Line regulation
Load regulation
Input current
Input ripple current2
VRIP
VRLINE
VRLOAD
IIN
IRIP
VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7)
IOUT = 0,
Inhibit (Pin 1) = open
IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
1,2,3
1,2,3
01
01
01
1,2,3
01
1,2,3
01
60 mVp-p
25 mV
50 mV
12
mA
30
50 mAp-p
Efficiency
Isolation
Capacitive load3,4
Power dissipation
load fault
EFF IOUT = 100% rated load
Input to output or any pin
ISO to case (except Pin 6) at
500Vdc TC = +25°C
CL
No effect on dc performance,
TC = +25°C
PD Overload 5
Short circuit
1
2,3
1
4
1
1,2,3
01 76
74
01 100
%
M
01 500 µF
01 6.0 W
01 2.0
Switching frequency
FS IOUT = 100% rated load
4,5,6
01 500 600 kHz
For Notes to Electrical Performance Characteristics, refer to page 5
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HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Table II. Electrical Performance Characteristics (continued)
Parameter
Output response to
step transient load
changes6
Recovery time step
transient load
changes6.7
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
VOTLOAD
50% to/from 100% rated
load
0% to/from 50% rated load
4,5,6
4,5,6
TTLOAD
50% to/from 100% rated
load
4,5,6
0% to 50% rated load
4,5,6
50% to 0% rated load
4,5,6
Output response to
transient step line
changes
Recovery time
transient step line
changes
Turn on overshoot
Turn on delay
VOTLINE
TTLINE
VTonOS
TonD
Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 8
Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 7, 8
IOUT = 0 and 100% rated
load
IOUT = 0 and 100% rated
load 9
4,5,6
4,5,6
4,5,6
4,5,6
Load fault recovery4,9
TrLF
4,5,6
Weight
Device
Types
01
01
01
01
01
01
01
AHF2805S  
Limits
Min Max
Unit
-300 +300
-500 +500
mVpk
70 µs
1200
8.0
µs
ms
500 mVpk
800 µs
600 mVpk
20 ms
20 ms
38 g
Notes to Table II:
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
4. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table II.
5. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short
circuit protection and is the condition of maximum power dissipation.
6. Load step transition time between 2 and 10 microseconds.
7. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT
at 50 percent load.
8. Input step transition time between 2 and 10 microseconds.
9. Turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal
from the Inhibit Pin (Pin 1) while power is applied to the input is unlimited.
5 2017-05-08


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HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Specifications
Absolute Maximum Ratings
Input Voltage
Soldering temperature
Operating case temperature
Storage case temperature
 
-0.5Vdc to +50VDC
+300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Table III. Electrical Performance Characteristics
AHF2812S
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A Device
Subgroups Types
Limits
Min Max
Unit
Output voltage
Output current1
VOUT
IOUT = 0
IOUT VIN = 16, 28, and 40Vdc
1
2,3
1,2,3
11.88 12.12
01 11.76 12.24 V
01
1000
mA
Output power
POUT VIN = 16, 28, and 40Vdc
1,2,3
01
12 W
Output ripple voltage2
Line regulation
Load regulation
Input current
Input ripple current2
VRIP
VRLINE
VRLOAD
IIN
IRIP
VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7)
IOUT = 0,
Inhibit (Pin 1) = open
IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
1,2,3
1,2,3
01
01
01
1,2,3
01
1,2,3
01
60 mVp-p
50 mV
50 mV
12
mA
50
50 mAp-p
Efficiency
Isolation
Capacitive load3,4
Power dissipation
load fault
EFF IOUT = 100% rated load
Input to output or any pin
ISO to case (except Pin 6) at
500Vdc TC = +25°C
CL
No effect on dc performance,
TC = +25°C
PD Overload 5
Short circuit
1
2,3
1
4
1
1,2,3
01 78
75
01 100
%
M
01 200 µF
01 6.0 W
01 2.0
Switching frequency
FS IOUT = 100% rated load
For Notes to Electrical Performance Characteristics, refer to page 7
4,5,6
01 500 600 kHz
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HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Table III. Electrical Performance Characteristics (continued)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Output response to
step transient load
changes6
Recovery time step
transient load
changes6.7
50% to/from 100% rated load
VOTLOAD
0% to/from 50% rated load
TTLOAD
50% to/from 100% rated load
0% to 50% rated load
50% to 0% rated load
4
5,6
4
5,6
4,5,6
4,5,6
4,5,6
Output response to
transient step line
changes
Recovery time
transient step line
changes
VOTLINE
Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 8
TTLINE
Input step 16V to/from 40Vdc,
IOUT = 100% rated load 4, 7, 8
4,5,6
4,5,6
Turn on overshoot
Turn on delay
VTonOS IOUT = 0 and 100% rated load
TonD
IOUT = 0 and 100% rated
load 9
4,5,6
4,5,6
Load fault recovery4,9
TrLF
4,5,6
Weight
Device
Types
01  
01
01
01
01
01
01
AHF2812S  
Limits
Min Max
-300
-450
-500
-750
+300
+450
+500
+750
100
1500
10
Unit
mVpk  
µs
µs
ms
1500 mVpk
800 µs
600 mVpk
20 ms
20 ms
38 g
Notes to Table III:
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
4. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table III.
5. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short
circuit protection and is the condition of maximum power dissipation.
6. Load step transition time between 2 and 10 microseconds.
7. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT
at 50 percent load.
8. Input step transition time between 2 and 10 microseconds.
9. Turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal
from the Inhibit Pin (Pin 1) while power is applied to the input is unlimited.
7 2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Specifications
Absolute Maximum Ratings
Input Voltage
Soldering temperature
Operating case temperature
Storage case temperature
 
-0.5Vdc to +50VDC
+300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Table IV. Electrical Performance Characteristics
AHF2815S
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A Device
Subgroups Types
Limits
Min Max
Unit
Output voltage
Output current1
VOUT
IOUT = 0
IOUT VIN = 16, 28, and 40Vdc
1
2,3
1,2,3
14.85 15.15
01
14.70 15.30
V
01 800 mA
Output power
POUT VIN = 16, 28, and 40Vdc
1,2,3
01
12 W
Output ripple voltage2
Line regulation
Load regulation
Input current
Input ripple current2
VRIP
VRLINE
VRLOAD
IIN
IRIP
VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7)
IOUT = 0,
Inhibit (Pin 1) = open
IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
1,2,3
1,2,3
01
01
01
1,2,3
01
1,2,3
01
60 mVp-p
50 mV
50 mV
12
mA
40
50 mAp-p
Efficiency
Isolation
Capacitive load3,4
Power dissipation
load fault
EFF IOUT = 100% rated load
Input to output or any pin
ISO to case (except Pin 6) at
500Vdc TC = +25°C
CL
No effect on dc performance,
TC = +25°C
PD Overload 5
Short circuit
1
2,3
1
4
1
1,2,3
01 78
75
01 100
%
M
01 200 µF
01 6.0 W
01 2.0
Switching frequency
FS IOUT = 100% rated load
4,5,6
01 500 600 kHz
For Notes to Electrical Performance Characteristics, refer to page 9
8
2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Table IV. Electrical Performance Characteristics (continued)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Device
Types
AHF2815S  
Limits
Min Max
Unit
Output response to
step transient load
changes6
VOTLOAD
50% to/from 100% rated load
0% to/from 50% rated load
4,5,6
4,5,6
-300 +300
01 mVpk
-750 +750
Recovery time step
transient load
changes6.7
Output response to
transient step line
changes
Recovery time
transient step line
changes
Turn on overshoot
Turn on delay
Load fault recovery4,9
Weight
TTLOAD
50% to/from 100% rated load
0% to 50% rated load
VOTLINE
TTLINE
50% to 0% rated load
Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 8
Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 7, 8
VTonOS
TonD
IOUT = 0 and 100% rated load
IOUT = 0 and 100% rated
load 9
TrLF
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
100 µs
01
1500
µs
10 ms
01 -1500 +1500 mVpk
01 800 µs
01 750 mVpk
01 20 ms
01 20 ms
38 g
Notes to Table IV:
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
4. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table IV.
5. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short
circuit protection and is the condition of maximum power dissipation.
6. Load step transition time between 2 and 10 microseconds.
7. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT
at 50 percent load.
8. Input step transition time between 2 and 10 microseconds.
9. Turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal
from the Inhibit Pin (Pin 1) while power is applied to the input is unlimited.
9 2017-05-08


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HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Specifications
AHF2805D
Absolute Maximum Ratings
Input Voltage
Soldering temperature
Operating case temperature
Storage case temperature
 
-0.5Vdc to +50VDC
+300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Table V. Electrical Performance Characteristics
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A Device
Subgroups Types
Limits
Min Max
Unit
Output voltage
VOUT
IOUT = 0
Output current1,2
Output power
Output ripple voltage3
Line regulation4
Load regulation4
Cross regulation5
Input current
Input ripple current3,4
IOUT
VIN = 16, 28, and 40Vdc,
each output
POUT VIN = 16, 28, and 40Vdc
VRIP
VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
VRLINE
VRLOAD
VRCROSS
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
10% to 90% load changes
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7)
IIN IOUT = 0,
Inhibit (Pin 1) = open
IRIP
IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1
2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
±4.95 ±5.05
01 ±4.90 ±5.10 V
01 120 1080 mA
01 12 W
01 60 mVp-p
01 30 mV
01 30 mV
01 ±10 %
12
01 mA
60
01 50 mAp-p
Efficiency4
EFF IOUT = 100% rated load
Isolation
Capacitive load6,7
Input to output or any pin
ISO to case (except Pin 6) at
500Vdc TC = +25°C
CL
No effect on dc performance,
TC = +25°C
Power dissipation
load fault
PD Overload
Short circuit
Switching frequency
FS IOUT = 100% rated load
For Notes to Electrical Performance Characteristics, refer to page 11
10
1,3
2
1
4
1,2,3
4,5,6
01 75
72
01 100
%
M
01 200 µF
01 6.0 W
2.0
01
500 600
kHz
2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Table V. Electrical Performance Characteristics (continued)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Output response to
step transient load
changes4, 9
Recovery time step
transient load
changes.4, 9, 10
VOTLOAD
50% to/from 100% rated
load
0% to/from 50% rated load
TTLOAD
50% to/from 100% rated
load
0% to 50% rated load
4,5,6
4,5,6
4,5,6
4,5,6
Device
Types
01
01
AHF2805D  
Limits
Min Max
Unit
-400 +400
-800 +800
mVpk
100 µs
5000 µs
Output response to
transient step line
changes4, 7, 11
Recovery time
transient step line
changes4, 7, 10, 11
Turn on overshoot4
Turn on delay
Load fault recovery4,9
Weight
VOTLINE
TTLINE
VTonOS
TonD
Input step 16V to/from
40Vdc, IOUT = 100% rated
load
Input step 16V to/from
40Vdc, IOUT = 100% rated
load
IOUT = 0 and 100% rated
load
IOUT = 0 and 100% rated
load9
TrLF
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
01 -400 +400 mVpk
01
1200
µs
01 600 mVpk
01 25 ms
01 25 ms
38 g
Notes to Table V:
1. Parameter guaranteed by line load and cross regulation tests.
2. Up to 90 percent of full power is available from either output provided the total output does not exceed 12W.
3. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
4. Load current split equally between +VOUT and -VOUT.
5. 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output.
6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the opera on of the load  
      fault detection circuitry, appearing as a short circuit during turn-on.
7. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table V.
8. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit
protection and is the condition of maximum power dissipation.
9. Load step transition time between 2 and 10 microseconds.
10. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent
load.
11. Input step transition time between 2 and 10 microseconds.
12. Turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the
Inhibit Pin (Pin 1) while power is applied to the input.
11 2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Specifications
Absolute Maximum Ratings
Input Voltage
Soldering temperature
Operating case temperature
Storage case temperature
 
-0.5Vdc to +50VDC
+300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Table VI. Electrical Performance Characteristics
AHF2812D
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A Device
Subgroups Types
Limits
Min Max
Unit
Output voltage
VOUT
IOUT = 0
Output current1,2
Output power
Output ripple voltage3
Line regulation4
Load regulation4
Cross regulation5
Input current
Input ripple current3,4
IOUT
VIN = 16, 28, and 40Vdc,
each output
POUT VIN = 16, 28, and 40Vdc
VRIP
VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
VRLINE
VRLOAD
VRCROSS
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
10% to 90% load changes
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7)
IIN IOUT = 0,
Inhibit (Pin 1) = open
IRIP
IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1
2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
±11.88 ±12.12
01 ±11.76 ±12.24 V
01 100 900 mA
01 12 W
01 60 mVp-p
01 30 mV
01 30 mV
01 3.0 %
12
01 mA
60
01 50 mAp-p
Efficiency4
EFF IOUT = 100% rated load
Isolation
Capacitive load6,7
Input to output or any pin
ISO to case (except Pin 6) at
500Vdc TC = +25°C
CL
No effect on dc perfor-
mance, TC = +25°C
Power dissipation
load fault
PD Overload
Short circuit
Switching frequency
FS IOUT = 100% rated load
For Notes to Electrical Performance Characteristics, refer to page 13
12
1,3
2
1
4
1,2,3
4,5,6
01 77
74
01 100
%
M
01 200 µF
01 6.0 W
3.0
01 500 600 kHz
2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Table VI. Electrical Performance Characteristics (continued)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Output response to
step transient load
changes4, 9
Recovery time step
transient load
changes.4, 9, 10
VOTLOAD
TTLOAD
50% to/from 100% rated
load
0% to/from 50% rated load
50% to/from 100% rated
load
0% to 50% rated load
4,5,6
4,5,6
4,5,6
4,5,6
Device
Types
01
01
AHF2812D  
Limits
Min Max
Unit
-200 +200
-800 +800
mVpk
70 µs
2000 µs
Output response to
transient step line
changes4, 7, 11
Recovery time
transient step line
changes4, 7, 10, 11
Turn on overshoot4
Turn on delay
Load fault recovery4,9
Weight
VOTLINE
TTLINE
VTonOS
TonD
Input step 16V to/from
40Vdc, IOUT = 100% rated
load
Input step 16V to/from
40Vdc, IOUT = 100% rated
load
IOUT = 0 and 100% rated
load
IOUT = 0 and 100% rated
load9
TrLF
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
01 -750 +750 mVpk
01
1200
µs
01 600 mVpk
01 25 ms
01 25 ms
38 g
Notes to Table VI:
1. Parameter guaranteed by line load and cross regulation tests.
2. Up to 90 percent of full power is available from either output provided the total output does not exceed 12W.
3. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
4. Load current split equally between +VOUT and -VOUT.
5. 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output.
6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the opera on of the load  
      fault detection circuitry, appearing as a short circuit during turn-on.
7. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table VI.
8. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit
protection and is the condition of maximum power dissipation.
9. Load step transition time between 2 and 10 microseconds.
10. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent
load.
11. Input step transition time between 2 and 10 microseconds.
12. Turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the
Inhibit Pin (Pin 1) while power is applied to the input.
13 2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Specifications
Absolute Maximum Ratings
Input Voltage
Soldering temperature
Operating case temperature
Storage case temperature
 
-0.5Vdc to +50VDC
+300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Table VII. Electrical Performance Characteristics
AHF2815D
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A Device
Subgroups Types
Limits
Min Max
Unit
Output voltage
Output current1,2
Output power
VOUT
IOUT
POUT
IOUT = 0
VIN = 16, 28, and 40Vdc,
each output
VIN = 16, 28, and 40Vdc
1
2,3
1,2,3
1,2,3
±14.85 ±15.15
01 ±14.70 ±15.30 V
01 80 720 mA
01 12 W
Output ripple voltage3
VRIP
VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
1,2,3
01
60 mVp-p
Line regulation4
Load regulation4
Cross regulation5
VRLINE
VRLOAD
VRCROSS
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
10% to 90% load changes
1,2,3
1,2,3
1,2,3
01
01
01
35 mV
35 mV
3.0 %
Input current
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7)
IIN
IOUT = 0,
Inhibit (Pin 1) = open
1,2,3
01
12
mA
60
Input ripple current3,4
IRIP
IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
01
50 mAp-p
Efficiency4
Isolation
Capacitive load6,7
Power dissipation
load fault
EFF IOUT = 100% rated load
Input to output or any pin
ISO to case (except Pin 6) at
500Vdc TC = +25°C
CL
No effect on dc perfor-
mance, TC = +25°C
PD Overload
Short circuit
1,3
2
1
4
1,2,3
78
01
74
01 100
%
M
01 200 µF
01 6.0 W
2.5
Switching frequency
FS IOUT = 100% rated load
For Notes to Electrical Performance Characteristics, refer to page 15
14
4,5,6
01 500 600 kHz
2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Table VII. Electrical Performance Characteristics (continued)
AHF2815D  
Parameter
Output response to
step transient load
changes4, 9
Recovery time step
transient load
changes.4, 9, 10
Symbol
VOTLOAD
TTLOAD
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
50% to/from 100% rated
load
4,5,6
0% to/from 50% rated load
50% to/from 100% rated
load
4,5,6
4,5,6
0% to 50% rated load
4,5,6
Device
Types
01
01
Limits
Min Max
-200 +200
-800 +800
70
2000
Unit
mVpk
µs
µs
Output response to
transient step line
changes4, 7, 11
Recovery time
transient step line
changes4, 7, 10, 11
Turn on overshoot4
Turn on delay
Load fault recovery4,9
Weight
VOTLINE
TTLINE
VTonOS
TonD
Input step 16V to/from
40Vdc, IOUT = 100% rated
load
Input step 16V to/from
40Vdc, IOUT = 100% rated
load
IOUT = 0 and 100% rated
load
IOUT = 0 and 100% rated
load9
TrLF
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
01 -750 +750 mVpk
01 1200 µs
01 750 mVpk
01 25 ms
01 25 ms
38 g
Notes to Table VII:
1. Parameter guaranteed by line load and cross regulation tests.
2. Up to 90 percent of full power is available from either output provided the total output does not exceed 12W.
3. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
4. Load current split equally between +VOUT and -VOUT.
5. 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output.
6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the opera on of the load  
      fault detection circuitry, appearing as a short circuit during turn-on.
7. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table VII.
8. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit
protection and is the condition of maximum power dissipation.
9. Load step transition time between 2 and 10 microseconds.
10. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent
load.
11. Input step transition time between 2 and 10 microseconds.
12. Turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the
Inhibit Pin (Pin 1) while power is applied to the input.
15 2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Application Information
Inhibit Function (Enable)
Connecting the Enable Input (Pin 1) to Input Common (Pin
7) will cause the converter to shut down. It is recommended
that the Enable Pin be driven by an open collector device
capable of sinking at least 400A of current. The open
circuit voltage of the Enable Input is 15±1.0VDC. If the Inhibit
function is not used, this Input can be left unconnected
because it is internally pulled-up.
Thermal Management
Assuming that there is no forced air flow, the package
temperature rise above ambient (T) may be calculated
using the following expression:
where A = Effective surface area in square inches
(including heat sink if used), P = Power dissipation in watts.
The total surface area of the AHF package is 4.9 square
inches. If a worst case full load efficiency of 78% is
assumed, then the case temperature rise can be calculated
as follows:
Hence if TAMBIENT = +25°C, the DC-DC converter case
temperature will be approximately 100°C if no heat
sink or air flow is provided.
To calculate the heat sink area required to maintain a
specific case temperature rise, the above equation
may be manipulated as follows:
As an example, if a maximum case temperature rise of
50°C above ambient is desired, then the required
effective heat sink area is:
16 2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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Block Diagrams
8
+Input
EMI
Filter
Under-Voltage
Detector
1
Enable Input
6
Case
Input Return
7
Single Output
Primary
Housekeeping
Supply
Drive
Pulse Width
Modulator FB
CS
8
+Input
EMI
Filter
Under-Voltage
Detector
1
Enable Input
6
Case
Input Return
7
17
Dual Output
Primary
Housekeeping
Supply
Drive
Pulse Width
Modulator FB
CS
AHF SERIES
(28V Input, Single/Dual Output)
4 +Vout
3
Output
Return
Error
Amp &
Ref
Error
Amp &
Ref
2 +Vout
3
Output
Return
4 -Vout
2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Mechanical Outlines
  Non-Flanged
0.030 dia., 8 pins
(0.760)
0.205
(5.21)
81
2
73
4
65
1.450
(36.83)
1.105
(28.07)
0.705
0.905 (17.91)
(22.99)
0.505
(12.83)
0.800
(20.32)
1.120
(28.45)
0.090 R Typ
(2.290)
The Tolerance for X.XXX = 0.005”
0.260
(6.600)
0.330
(8.380)
MAX
  Flanged
The Tolerance for X.XXX = 0.005”
Pin Designation Tables
Standard Microcircuit Drawing Equivalence Table
Single Output
Pin #
1
2
3
4
5
6
7
8
Designation
Enable Input
NC
Output Return
+Output
NC
Case Ground
Input Return
+Input
Dual Output
Pin #
1
2
3
4
5
6
7
8
Designation
Enable Input
+Output
Output Return
-Output
NC
Case Ground
Input Return
+Input
Standard Microcircuit Vendor Cage IR Hirel Standard
Drawing Number
Code
Part Number
5962-91600
52467
AHF2805S
5962-94568
52467
AHF2812S
5962-94563
52467
AHF2815S
5962-05205
52467
AHF2805D
5962-92111
52467
AHF2812D
5962-92351
52467
AHF2815D
18 2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
Device Screening
Requirement
MIL-STD-883 Method No Suffix
ES
HB
CH
Temperature Range
Element Evaluation
Non-Destructive Bond Pull
Internal Visual
Temperature Cycle
Constant Acceleration
MIL-PRF-38534
2023
2017
1010
2001, Y1 Axis
-20°C to +85°C -55°C to +125°C-55°C to +125°C -55°C to +125°C
N/A N/A
N/A Class H
N/A N/A N/A N/A
Yes Yes Yes
N/A
Cond B
Cond C
Cond C
N/A
500 Gs
3000 Gs
3000 Gs
PIND
2020 N/A N/A N/A N/A
Burn-In
1015
N/A 48 hrs @ hi temp 160hrs @ 125°C 160 hrs @ 125°C
Final Electrical
(Group A)
PDA
Seal, Fine and Gross
Radiographic
External Visual
MIL-PRF-38534
& Specification
MIL-PRF-38534
1014
2012
2009
25°C
N/A
Cond A
N/A
25°C
N/A
Cond A, C
N/A
Yes
-55°C, +25°C,
+125°C
N/A
Cond A, C
N/A
Yes
-55°C, +25°C,
+125°C
10%
Cond A, C
N/A
Yes
Notes:
Best commercial practice.
Sample tests at low and high temperatures.
-55°C to +105°C for AHE, ATO, ATW.
Part Numbering
IR HiRel Headquarters: 101 N. Sepulveda Blvd., El Segundo, California 90245, USA Tel: (310) 252-7105
IR HiRel Leominster: 205 Crawford St., Leominster, Massachusetts 01453, USA Tel: (978) 534-5776
IR HiRel San Jose: 2520 Junction Avenue, San Jose, California 95134, USA Tel: (408) 434-5000
Data and specifications subject to change without notice.
19 2017-05-08


AHF2805D (International Rectifier)
HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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AHF SERIES
(28V Input, Single/Dual Output)
IMPORTANT NOTICE
The information given in this document shall be in no event regarded as guarantee of conditions or characteristic. The
data contained herein is a characterization of the component based on internal standards and is intended to
demonstrate and provide guidance for typical part performance. It will require further evaluation, qualification and
analysis to determine suitability in the application environment to confirm compliance to your system requirements.
With respect to any example hints or any typical values stated herein and/or any information regarding the application of
the product, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind including without
limitation warranties on non- infringement of intellectual property rights and any third party.
In addition, any information given in this document is subject to customer’s compliance with its obligations stated in this
document and any applicable legal requirements, norms and standards concerning customer’s product and any use of
the product of Infineon Technologies in customer’s applications.
The data contained in this document is exclusively intended for technically trained staff. It is the responsibility of any
customer’s technical departments to evaluate the suitability of the product for the intended applications and the
completeness of the product information given in this document with respect to applications.
For further information on the product, technology, delivery terms and conditions and prices, please contact your local
sales representative or go to (www.infineon.com/hirel).
WARNING
Due to technical requirements products may contain dangerous substances. For information on the types in question,
please contact your nearest Infineon Technologies office.
20 2017-05-08




AHF2805D.pdf
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