ACPL-344JT (AVAGO)
Automotive 2.5A Gate-Drive Optocoupler

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ACPL-344JT
Automotive 2.5A Gate-Drive Optocoupler
with Integrated IGBT Desat Overcurrent Sensing,
Miller-Current Clamping, and Under-Voltage Lockout Feedback
Data Sheet
Description
The Avago Technologies Automotive 2.5A Gate-Drive
Optocoupler features fast propagation delay with
excellent timing-skew performance. Smart features that
are integrated to protect the IGBT include IGBT
desaturation sensing with soft-shutdown protection
and fault feedback, under-voltage lockout and feedback,
and active Miller-current clamping. This full-featured
and easy-to-implement IGBT gate-drive optocoupler
comes in a compact, surface-mountable SO-16 package
for space savings. It is suitable for traction power-train
inverter, power converter, battery charger, air-con, and
oil-pump motor drives in HEV and EV applications and
satisfies automotive AEC-Q100 semiconductor
requirements.
Avago's R2Coupler isolation products provide reinforced
insulation and reliability that deliver safe-signal isolation
critical in automotive and high-temperature industrial
applications.
Functional Diagram
VE VCC2
13 12
VCC1 3
UVLO
/UVLO 5
/FAULT 6
VEE1 1
NC 2
NC 4
AN 7
CA 8
Input
Driver
Output
Driver
CuOrvreernt
SS Control
Miller Control
Figure 1. ACPL-344JT Functional Diagram.
9 16
VEE2 VEE2
15 LED2+
14 DESAT
11 VO
10 SSD/
CLAMP
Features
• Qualified to AEC-Q100 Grade 1 Test Guidelines
• Automotive temperature range: –40°C to +125°C
• Common Mode Rejection (CMR): >50 kV/μs at
VCM = 1500V
• High Noise Immunity:
– Miller-Current Clamping
– Direct LED input with low-input impedance and
low-noise sensitivity
– Negative Gate Bias
• Peak output current: 2.5A max.
• Miller Clamp-Sinking Current: 1.9A max.
• Wide Operating Voltage: 15V to 25V
• Propagation delay: 250 ns max.
• Integrated fail-safe IGBT protection
– Desat sensing, 'Soft' IGBT turn-off, and Fault
Feedback
– Under-Voltage Lock-Out protection (UVLO) with
Feedback
• SO-16 package with 8 mm clearance and creepage
• Regulatory approvals:
– UL1577, CSA
– IEC/EN/DIN EN 60747-5-5
Applications
• Automotive isolated IGBT/MOSFET inverter gate drive
• Automotive DC-DC converter
• AC and brushless-DC motor drives
• Industrial inverters for power supplies and motor
controls
• Uninterruptible power supplies (UPS)
CAUTION: It is advised that normal static precautions be taken in handling and assembly
of this component to prevent damage and/or degradation which may be induced by ESD.


ACPL-344JT (AVAGO)
Automotive 2.5A Gate-Drive Optocoupler

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Ordering Information
Part Number
RoHS Compliant Package
ACPL-344JT
ACPL-344JT
-000E
-500E
SO-16
Surface Mount Tape and Reel
X
XX
IEC/EN/DIN EN
60747-5-5
X
X
Quantity
45 per tube
850 per reel
To order, choose a part number from the Part Number column and combine with the desired option from the RoHS
Compliant column to form an order entry.
Example 1:
ACPL-344JT-500E orders the SO-16 Surface Mount package in Tape and Reel packaging with RoHS-compliant IEC/EN/
DIN EN 60747-5-5 Safety Approval.
Option data sheets are available. Contact your Avago sales representative or authorized distributor for information.
Package Outline Drawings
16-Lead Surface Mount
0.457 typ.
(0.018)
1.270 BSC
(0.050)
Part Number
Date Code
Recommended Land Pattern
RoHS
Compliance
Indicator
A 344JT
YYWW
EE
7.493
+0.254
–0.127
(0.295
+0.010)
–0.005)
9°(×4)
10.363
+0.254
–0.127
(0.408
+0.010)
–0.005)
Extended
Datecode for
lot tracking
3.505 ±0.127
(0.138 ±0.005)
0.635
(0.025)
8.763 ±0.254
(0.345 ±0.010)
9°(×4)
Dimensions in millimeters (inches)
0.203 ±0.102
(0.008 ±0.004)
Stando
Note:
Lead coplanarity = 0.10 mm (0.004 inches)
Floating lead protrusion = 0.25 mm (0.010 inches) max.
Mold Flash on each side = 0.127 mm (0.005 inches) max.
(0 to 8°)
0.635 min.
(0.025)
10.363 ±0.254
(0.408 ±0.010)
Recommended Lead-free IR Profile
Recommended reflow condition as per JEDEC Standard, J-STD-020 (latest revision).
Non-halide flux should be used.
11.634
(0.458)
2.160
(0.085)
1.270
(0.050)
0.254 typ.
(0.010)
2


ACPL-344JT (AVAGO)
Automotive 2.5A Gate-Drive Optocoupler

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Product Overview Description
The ACPL-344JT (shown in Figure 1) is a highly integrated power control device that incorporates all the necessary
components for a complete, isolated IGBT gate-drive circuit. It features IGBT desaturation sensing with soft-shutdown
protection and fault feedback, under-voltage lockout and feedback, and active Miller current clamping in a SO-16
package. Direct LED input allows flexible logic configuration and differential current-mode driving with low-input
impedance—greatly increasing noise immunity.
Package Pin Out
1 VEE1
2 NC
3 VCC1
4 NC
5 /UVLO
6 /FAULT
7 AN
8 CA
VEE2 16
LED2+ 15
DESAT 14
VE 13
VCC2 12
VO 11
SSD/CLAMP 10
VEE2 9
Figure 2. Pin-out of ACPL-344JT
Pin Description
Pin Name Function
VEE1
NC
Input common
No connection
VCC1
NC
/UVLO
/FAULT
AN
Input power supply
No connection
VCC2 undervoltage lockout feedback
Overcurrent fault feedback
Input LED anode
CA Input LED cathode
Pin Name Function
VEE2
Negative power supply
LED2+
No connection, for testing only
DESAT
Desat overcurrent sensing
VE IGBT Emitter Reference
VCC2
Positive power supply
VO Driver output to IGBT gate
SSD/CLAMP Soft Shutdown/Miller Current clamping output.
(For proper functionality, this pin must be connected to
the gate of the IGBT directly or through a current buffer.)
VEE2
Negative Power Supply
3


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Automotive 2.5A Gate-Drive Optocoupler

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Typical Application/Operation
Introduction to Fault Detection and Protection
The power stage of a typical three-phase inverter is susceptible to several types of failures, most of which are
potentially destructive to the power IGBTs. These failure modes can be grouped into four basic categories: phase and
rail supply short circuits due to user misconnect or bad wiring, control signal failures due to noise or computational
errors, overload conditions induced by the load, and component failures in the gate-drive circuitry. Under any of these
fault conditions, the current through the IGBTs can increase rapidly, causing excessive power dissipation and heating.
The IGBTs become damaged when the current load approaches the saturation current of the device, and the
collector-to-emitter voltage rises above the saturation voltage level. The drastically increased power dissipation
quickly overheats the power device and destroys it. To prevent damage to the drive, fault protection must be
implemented to reduce or turn-off the overcurrent during a fault condition.
A circuit providing fast local-fault detection and shutdown is an ideal solution, but the number of required
components, board space consumed, cost, and complexity have, until now, limited its use to high performance drives.
The features this circuit must have include high speed, low cost, low resolution, low power dissipation, and small size.
The ACPL-344JT satisfies these criteria by combining a high-speed, high-output current driver, high-voltage optical
isolation between the input and output, local IGBT desaturation detection and shut down, and optically isolated fault
and UVLO-status feedback signal into a single 16-pin surface-mount package.
The fault-detection method adopted in the ACPL-344JT monitors the saturation (collector) voltage of the IGBT and
triggers a local-fault shutdown sequence if the collector voltage exceeds a predetermined threshold. A small gate-
discharge device slowly reduces the high short-circuit IGBT current to prevent damaging voltage spikes. Before the
dissipated energy can reach destructive levels, the IGBT is shut off. During the off state of the IGBT, the fault detect
circuitry is simply disabled to prevent false ‘fault’ signals.
The alternative protection scheme of measuring IGBT current to prevent desaturation is effective if the short-circuit
capability of the power device is known, but this method will fail if the gate-drive voltage decreases enough to only
partially turn on the IGBT. By directly measuring the collector voltage, the ACPL-344JT limits the power dissipation
in the IGBT even with insufficient gate-drive voltage. Another more subtle advantage of the desaturation detection
method is that power dissipation in the IGBT is monitored, while the current sense method relies on a preset current
threshold to predict the safe limit of operation. Therefore, an overly- conservative overcurrent threshold is not required
to protect the IGBT.
Recommended Application Circuit
The ACPL-344JT has non-inverting gate-control inputs, and an open-collector fault and UVLO outputs suitable for
wired-OR applications.
The recommended application circuit shown in Figure 3 shows a typical gate-drive implementation using the ACPL-
344JT.
The two supply bypass capacitors (1.0 μF minimum) provide the large transient currents necessary during a switch-
ing transition. The Desat diode and 220 pF blanking capacitor are the necessary external components for the fault
detection circuitry. The gate resistor (10Ω) serves to limit gate-charge current and indirectly control the IGBT collector
voltage rise-and-fall times. The open-collector fault and UVLO outputs have a passive 10 kΩ pull-up resistor and a 330
pF filtering capacitor.
4


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Automotive 2.5A Gate-Drive Optocoupler

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DESAT Fault Detection Blanking Time
The DESAT fault detection circuitry must remain disabled for a short time period following the turn-on of the IGBT to
allow the collector voltage to fall below the DESAT threshold. This time period, called the total DESAT blanking time, is
controlled by the both internal DESAT blanking time tDESAT(BLANKING) (Figure 6) and external blanking time, determined
by internal charge current, the DESAT voltage threshold, and the external DESAT capacitor.
The total blanking time is calculated in terms of internal blanking time (tDESAT(BLANKING)), external capacitance (CBLANK),
FAULT threshold voltage (VDESAT), and DESAT charge current (ICHG):
tBLANK = tDESAT(BLANKING) + CBLANK × VDESAT/ICHG
VCC1
+ 5V
10 kΩ
10 kΩ
µC 330 pF
330 pF
1 VEE1
1 µF 2 NC
3 VCC1
4 NC
5 /UVLO
6 /FAULT
130Ω
130Ω 7 AN
8 CA
VEE2 16
LED2+ 15
DESAT 14
VE 13
VCC2 12
VO 11
SSD/CLAMP 10
VEE2 9
VCC2
1 kΩ
220 pF
1 µF
10Ω
10 µF
10 µF
ACPL-344JT
Figure 3. Typical gate-drive circuit with Desat current sensing using ACPL-344JT.
VEE2
Description of Gate Driver and Miller Clamping
The gate driver is directly controlled by the LED current. When LED current is driven HIGH, the output of ACPL-344JT
is capable of delivering 2.5A sourcing current to drive the IGBT’s gate. While LED is switched off, the gate driver can
provide 2.5A sinking current to switch the gate off fast. An additional Miller clamping pull-down transistor is activated
when output voltage reaches about 2V with respect to VEE2 to provide a low impedance path to Miller Current, as
shown in Figure 4.
IF
VO
VGATE
Figure 4. Gate-Drive Signal Behavior.
5


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Automotive 2.5A Gate-Drive Optocoupler

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Description of Under-Voltage Lockout
Insufficient gate voltage to IGBT can increase turn-on resistance of IGBT, resulting in large power loss and IGBT damage
due to high heat dissipation. ACPL-344JT monitors the output power supply constantly. When output power supply is
lower than under-voltage lockout (UVLO) threshold, gate-driver output shuts off to protect IGBT from low voltage bias.
During power-up, the UVLO feature forces the gate driver output LOW to prevent unwanted turn-on at lower voltage.
V CC1
V CC2
LED IF
VO
V UVLO-
tUVLO_OFF
V UVLO+
tUVLO_ON
/FAULT
/UVLO
tPHL_UVLO
tPLH_UVLO
Figure 5. Circuit Behaviors at Power up and Power down.
Description of Operation During Overcurrent Condition
1. DESAT terminal monitors IGBT’s VCE voltage.
2. When the voltage on the DESAT terminal exceeds 7V, the output voltage (VOUT) to IGBT gate goes to Hi-Z state and
the SSD/CLAMP output is slowly lowered.
3. FAULT output goes LOW, notifying the microcontroller of the fault condition.
4. Microcontroller takes appropriate action.
5. When tDESAT(MUTE) expires, LED input must be kept LOW for tDESAT(RESET) before the fault condition is cleared. FAULT
status returns to HIGH and SSD/CLAMP output returns to Hi-Z state.
6. Output (VOUT) starts to respond to LED input after the fault condition is cleared.
IF t DESAT (RESET)
VO state
SSD/Clamp
State
Hi-Z SSD Clamp
VGATE
t DESAT (90%)
VDESAT_TH
VDESAT
t DESAT (BLANKING)
t DESAT (MUTE)
V/FAULT
t DESAT (/FAULT)
Figure 6. Circuit Behaviors During Overcurrent Event.
Hi-Z
Hi-Z Clamp Hi-Z
Clamp
6


ACPL-344JT (AVAGO)
Automotive 2.5A Gate-Drive Optocoupler

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The ACPL-344JT is approved by the following organizations:
UL
Approved under
UL 1577, component recognition
program up to VISO = 5000VRMS
CSA
Approved under
CSA Component Acceptance Notice #5,
File CA 88324.
IEC/EN/DIN EN 60747-5-5
Approved under
IEC 60747-5-5
EN 60747-5-5
DIN EN 60747-5-5
IEC/EN/DIN EN 60747-5-5 Insulation Characteristics
Description
Symbol Characteristic Unit
Insulation Classification per DIN VDE 0110/1.89, Table 1
for rated mains voltage ≤ 150VRMS
for rated mains voltage ≤ 300VRMS
for rated mains voltage ≤ 600VRMS
for rated mains voltage ≤ 1000VRMS
Climatic Classification
I – IV
I – IV
I – IV
I – III
40/125/21
Pollution Degree (DIN VDE 0110/1.89)
2
Maximum Working Insulation Voltage
Input to Output Test Voltage, Method b
VIORM × 1.875 = VPR, 100% Production Test with tm = 1 sec,
Partial discharge < 5 pC
VIORM
VPR
1230
2306
VPEAK
VPEAK
Input to Output Test Voltage, Method a
VIORM × 1.6 = VPR, Type and Sample Test, tm = 10 sec,
Partial Discharge < 5 pC
VPR 1968
VPEAK
Highest Allowable Overvoltage (Transient Overvoltage tini = 60 sec)
VIOTM
8000
VPEAK
Safety-limiting values – maximum values allowed in the event of a failure (also see Figure 7)
Case Temperature
Input Power
Output Power
TS
PS,INPUT
PS,OUTPUT
175
400
1200
°C
mW
mW
Insulation Resistance at TS, VIO = 500 V
RS >109
Notes:
1. Isolation characteristics are guaranteed only within the safety maximum ratings which must be ensured by protective circuits in application.
Surface mount classification is class A in accordance with CECCOO802.
2. Refer to the optocoupler section of the Isolation and Control Components Designer’s Catalog, under Product Safety Regulation section IEC/EN/DIN
EN 60747-5-5, for a detailed description of Method a and Method b partial-discharge test profiles.
1400
1200
PS, Output
PS, Input
1000
800
600
400
200
0 0 25
50 75 100 125 150 175
TS—Case Temperature (°C)
Figure 7. Dependence of safety limiting values on temperature.
200
7


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Automotive 2.5A Gate-Drive Optocoupler

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Insulation and Safety Related Specifications
Parameter
Symbol
Minimum External Air Gap (Clear-
ance)
Minimum External Tracking
(Creepage)
Minimum Internal Plastic Gap
(Internal Clearance)
L(101)
L(102)
Tracking Resistance (Comparative
Tracking Index)
Isolation Group
CTI
Value
8.3
8.3
0.5
Units
mm
mm
mm
>175
V
IIIa
Conditions
Measured from input terminals to output terminals,
shortest distance through air.
Measured from input terminals to output terminals,
shortest distance path along body.
Through insulation distance conductor to conductor,
usually the straight line distance thickness between the
emitter and detector.
DIN IEC 112/VDE 0303 Part 1
Material Group (DIN VDE 0110)
Absolute Maximum Ratings
Unless otherwise specified, all voltages at input IC reference to VEE1, all voltages at output IC reference to VEE2.
Parameter
Storage Temperature
Operating Temperature
IC Junction Temperature
Average Input Current
Peak Transient Input Current
(<1 μs pulse width, 300 pps)
Reverse Input Voltage
/Fault Output Current (Sinking)
/Fault Pin Voltage
/UVLO Output Current (Sinking)
/UVLO Pin Voltage
Positive Input Supply Voltage
Total Output Supply Voltage
Negative Output Supply Voltage
Positive Output Supply Voltage
Gate-Drive Output Voltage
Peak Output Current
Peak Clamping Sinking Current
Miller Clamping Pin Voltage
Desat Voltage
Output IC Power Dissipation
Input IC Power Dissipation
Symbol
TS
TA
TJ
IF(AVG)
IF(TRAN)
VR
I/FAULT
V/FAULT
I/UVLO
V/UVLO
VCC1
VCC2–VEE2
VEE2–VE
VCC2–VE
Vo(peak)
|IO(peak)|
ICLAMP
VCLAMP–VEE2
VDESAT–VE
PO
PI
Min. Max. Units Note
–55
+150
°C
–40
+125
°C
150 °C 1
20 mA
1A
–0.5
–0.5
–0.5
–0.5
–15
–0.5
–0.5
–0.5
VE – 0.5
6
10
+6
10
+6
+26
+30
+0.5
+30
VCC2 + 0.5
2.5
2
VCC2 + 0.5
VCC2 + 0.5
580
150
V
mA
V
mA
V
V
V
V
V
V
A
A
V
V
mW
mW
2
3
3
4
1
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Automotive 2.5A Gate-Drive Optocoupler

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Recommended Operating Conditions
Parameter
Symbol Min.
Operating Temperature
Input Supply Voltage
Total Output Supply Voltage
Negative Output Supply Voltage
Positive Output Supply Voltage
Input LED Current
Input Voltage (OFF)
Input Pulse Width
TA
VCC1
VCC2–VEE2
VEE2–VE
VCC2–VE
IF(ON)
VF(OFF)
tON(LED)
–40
8
15
–10
15
10
–5.5
500
Max.
+125
18
25
0
25
16
+0.8
Units Notes
°C
V
V5
V3
V
mA
V
ns
Electrical Specifications
Unless otherwise specified, all Minimum/Maximum specifications are at recommended operating conditions, all volt-
ages at input IC are referenced to VEE1, all voltages at output IC referenced to VEE2. All typical values at TA = 25°C, VCC1 =
12 V, VCC2–VEE2 = 20 V, VE–VEE2 = 0 V.
Parameter
IC Supply Current
Symbol Min.
Typ.
Max.
Units Test Conditions Fig. Note
Input Supply Current
Output Low Supply Current
Output High Supply Current
Logic Input and Output
ICC1
ICC2L
ICC2H
3.7 6.0
10.5 13.2
10.6 13.6
mA
mA IF = 0 mA
VCC2 = 20V
mA IF = 10 mA
VCC2 = 20V
8
9
9
LED Forward Voltage (VAN – VCA) VF
1.25 1.55 1.85 V IF = 10 mA
10
LED Reverse Breakdown
Voltage(VCA – VAN)
VBR 6
V IF = –10 μA
LED Input Capacitance
CIN
90
pF
LED Turn-on Current Threshold
Low to High
ITH+
2.7 6.6 mA VO = 5V
11
LED Turn-on Current Threshold
High to Low
ITH–
2.1 6.4 mA VO = 5V
11
LED Turn-on Current Hysteresis
FAULT Logic Low Output Current
FAULT Logic High Output Current
UVLO Logic Low Output Current
UVLO Logic High Output Current
ITH_HYS
IFAULT_L
IFAULT_H
IUVLO_L
IUVLO_H
4.0
4.0
0.6
9.0
9.0
20
20
mA
mA V/FAULT = 0.4V
uA V/FAULT = 5V
mA V/UVLO = 0.4V
uA V/UVLO = 5V
9


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Electrical Specifications (continued)
Unless otherwise specified, all Minimum/Maximum specifications are at recommended operating conditions, all volt-
ages at input IC are referenced to VEE1, all voltages at output IC referenced to VEE2. All typical values at TA = 25°C, VCC1 =
12 V, VCC2–VEE2 = 20 V, VE–VEE2 = 0 V.
Parameter
Gate Driver
Symbol Min.
Typ.
Max.
Units Test Conditions Fig. Note
High Level Output Current
Low Level Output Current
High Level Output Voltage
Low Level Output Voltage
VIN to High Level Output
Propagation Delay Time
IOH
–2.0
–0.75
A VO = VCC2 – 3 V 12 4
IOL 1.0 2.2
A
VO = VEE2 + 2.5V 13
4
VOH VCC2 – 0.5 VCC2 – 0.2
V IO = –100 mA
6-8
VOL
0.1 0.5
V IO = 100 mA
tPLH 50
130 250
ns Vsource = 5V
Rf = 260Ω
Rg = 10Ω
Cload = 10 nF
f = 10 kHz
14,19 9
Duty Cycle = 50%
VIN to Low Level Output
Propagation Delay Time
tPHL 50
150 250
ns
14,19 10
Pulse Width Distortion
PWD
–100
+20
+100
ns
11,12
Dead Time Distortion (tPLH–tPHL)
10% to 90% Rise Time
90% to 10% Fall Time
Output High Level Common
Mode Transient Immunity
DTD
tR
tF
|CMH|
Output Low Level Common Mode |CML|
Transient Immunity
Active Miller Clamp and Soft Shutdown
–150
50
50
–40
70
50
>70
>70
+105
ns
ns
ns
kV/μs
kV/μs
TA = 25°C,
IF = 10 mA
VCM = 1500V
TA = 25°C,
IF = 0 mA
VCM = 1500V
12,13
21 14
21 15
Low Level Soft Shutdown Current ISSD
During Fault Condition
22
35
48
mA VSSD – VEE2 = 14 V 15
Clamp Threshold Voltage
Clamp Low Level Sinking Current
VTH_CLAMP
ICLAMP
0.75
VCC2 UVLO Protection (UVLO voltage VUVLO reference to VE)
VCC2 UVLO Threshold Low to High VUVLO+
11.0
VCC2 UVLO Threshold High to Low VUVLO-
10.1
VCC2 UVLO Hysteresis
VUVLO_HYS
VCC2 to UVLO High Delay
tPLH_UVLO
VCC2 to UVLO Low Delay
tPHL_UVLO
VCC2 UVLO to VOUT High Delay
tUVLO_ON
VCC2 UVLO to VOUT Low Delay
tUVLO_OFF
2.0
1.9
12.4
11.3
1.1
10
10
10
10
3.0
13.7
12.8
V
A VCLAMP =
VEE2 + 2.5 V
V VO > 5 V
V VO < 5 V
V
μs
μs
μs
μs
8,16
8,17
8
18
19
20
21
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Automotive 2.5A Gate-Drive Optocoupler

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Electrical Specifications (continued)
Unless otherwise specified, all minimum/maximum specifications are at recommended operating conditions, all
voltages at input IC are referenced to VEE1, all voltages at output IC referenced to VEE2. All typical values at TA = 25°C,
VCC1 = 12V, VCC2 – VEE2 = 20V, VE – VEE2 = 0V.
Parameter
Symbol
Min. Typ. Max. Units Test Conditions Fig. Note
Desaturation Protection (Desat voltage VDESAT reference to VE)
Desat Sensing Threshold
VDESAT
6.2 7.0 7.8 V
16 8
Desat Charging Current
ICHG
–1.2 –0.9 –0.6 mA VDESAT = 2 V
17
Desat Discharging Current
IDSCHG
20 53
mA VDESAT = 8 V
18
Internal Desat Blanking Time
tDESAT(BLANKING) 0.3 0.6 1.0 μs CSSD = 1 nF
22
Desat Sense to 90% SSD Delay
tDESAT(90%)
0.3 μs
23
Desat Sense to 10% SSD Delay
tDESAT(10%)
0.8 μs
24
Desat to Low Level /FAULT Signal Delay
tDESAT(/FAULT)
7.0 μs
25
Output Mute Time due to Desat
tDESAT(MUTE)
2.3 3.2
4.1 ms
26
Time for Input Kept Low Before Fault Reset to tDESAT(RESET) 2.3 3.2 4.1 ms
High
27
Package Characteristics
Parameter
Input-Output Momentary Withstand Voltage
Symbol Min.
VISO 5000
Resistance (Input-Output)
Capacitance (Input-Output)
Thermal coefficient between LED and input IC
Thermal coefficient between LED and output IC
Thermal coefficient between input IC and output IC
Thermal coefficient between LED and Ambient
Thermal coefficient between input IC and Ambient
Thermal coefficient between output IC and Ambient
RI-O
CI-O
AEI
AEO
AIO
AEA
AIA
AOA
Typ. Max.
1014
1.3
35.4
33.1
25.6
176.1
92
76.7
Units
VRMS
pF
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Test Conditions
Notes
RH < 50%, t = 1 min. 28, 29, 30
TA = 25°C
VI-O = 500 VDC
30
f = 1 MHz
11


ACPL-344JT (AVAGO)
Automotive 2.5A Gate-Drive Optocoupler

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Notes:
1. Output IC power dissipation is derated linearly above 100°C from 580 mW to 260 mW at 125°C.
2. This supply is optional. Required only when negative gate drive is implemented.
3. Maximum pulse width = 1 μs, maximum duty cycle = 1%.
4. Maximum 500 ns pulse width if peak VDESAT > 10 V.
5. 15V is the recommended minimum operating positive supply voltage (VCC2 – VE) to ensure adequate margin in excess of the maximum VUVLO+
threshold of 13.5V.
6. For High-Level Output Voltage testing, VOH is measured with a DC-load current. When driving capacitive loads, VOH approaches VCC as IOH
approaches zero.
7. Maximum pulse width = 1.0 ms, maximum duty cycle = 20%.
8. Once VOUT of the ACPL-344JT is allowed to go high (VCC2 – VE > VUVLO), the DESAT detection feature of the ACPL-344JT will be the primary source
of IGBT protection. UVLO is required to ensure DESAT is functional. Once VCC2 exceeds VUVLO+ threshold, DESAT remains functional until VCC2
is below the VUVLO- threshold. Thus, the DESAT detection and UVLO features of the ACPL-344JT work in conjunction to ensure constant IGBT
protection.
9. tPLH is defined as the propagation delay from 50% of LED input IF to 50% of High-level output.
10. tPHL is defined as the propagation delay from 50% of LED input IF to 50% of Low-level output.
11. Pulse Width Distortion (PWD) is defined as (tPHL – tPLH) of any given unit.
12. As measured from IF to VO.
13. Dead Time Distortion (DTD) is defined as (tPLH – tPHL) between any two ACPL-344JT parts under the same test conditions.
14. Common-mode transient immunity in the high state is the maximum tolerable dVCM/dt of the common-mode pulse, VCM, to assure that the
output remains in a high state (meaning VO > 15V).
15. Common-mode transient immunity in the low state is the maximum tolerable dVCM/dt of the common-mode pulse, VCM, to assure that the
output remains in a low state (meaning VO < 1.0V).
16. The “increasing” (meaning turn-on or “positive going” direction) of VCC2 – VE.
17. The “decreasing” (meaning turn-off or “negative going” direction) of VCC2 – VE.
18. The delay time when VCC2 exceeds UVLO+ threshold to UVLO High – 50% of UVLO positive-going edge.
19. The delay time when VCC2 falls below UVLO– threshold to UVLO Low – 50% of UVLO negative-going edge.
20. The delay time when VCC2 exceeds UVLO+ threshold to 50% of High-level output.
21. The delay time when VCC2 falls below UVLO– threshold to 50% of Low-level output.
22. The delay time for ACPL-344JT to respond to a DESAT fault condition without any external DESAT capacitor.
23. The amount of time from when DESAT threshold is exceeded to 90% of VGATE at mentioned test conditions.
24. The amount of time from when DESAT threshold is exceeded to 10% of VGATE at mentioned test conditions.
25. The amount of time from when DESAT threshold is exceeded to FAULT output Low – 50% of VCC1 voltage.
26. The amount of time when DESAT threshold is exceeded, Output is mute to LED input.
27. The amount of time when DESAT Mute time is expired, LED input must be kept LOW for Fault status to return to HIGH.
28. In accordance with UL1577, each optocoupler is proof tested by applying an insulation test voltage ≥6000VRMS for 1 second.
29. The Input-Output Momentary Withstand Voltage is a dielectric voltage rating that should not be interpreted as an input-output continuous-
voltage rating. For the continuous-voltage rating, refer to your equipment level safety specification or IEC/EN/DIN EN 60747-5-5 Insulation
Characteristics Table.
30. Device considered a two-terminal device: pins 1 through 8 are shorted together and pins 9 through 16 are shorted together.
12


ACPL-344JT (AVAGO)
Automotive 2.5A Gate-Drive Optocoupler

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Thermal Characteristics are based on the ground planes layout of the evaluation PCB, shown as follows:
60 mm
60 mm
VEE1
VEE1
VEE2
VEE2
PCB Top Side
PCB Bottom Side
Notes on Thermal Calculation
Application and environmental design for ACPL-344JT must ensure that the junction temperature of the internal ICs and
LED within the gate driver optocoupler do not exceed 150°C. The following equations calculate the maximum power
dissipation and its corresponding effect on junction temperatures.
LED Junction Temperature = (AEA × PE) + (AEI × PI) + (AEO × PO) + TA
Input IC Junction Temperature = (AEI × PE) + (AIA × PI) + (AIO × PO) + TA
Output IC Junction Temperature = (AEO × PE) + (AIO × PI) + (AOA × PO) + TA
PE—LED Power Dissipation
PI—Input IC Power Dissipation
PO—Output IC Power Dissipation
Calculation of LED Power Dissipation
LED Power Dissipation, PE = IF(LED) (Recommended Max) × VF(LED) (125°C) × Duty Cycle
Example: PE = 16 mA × 1.25 × 50% duty cycle = 10 mW
Calculation of Input IC Power Dissipation
Input IC Power Dissipation, PI = ICC1 (Max) × VCC1 (Recommended Max.)
Example: PI = 6 mA × 18 V = 108 mW
13


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Automotive 2.5A Gate-Drive Optocoupler

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Calculation of Output IC Power Dissipation
Output IC Power Dissipation, PO = VCC2 (Recommended Max.) × ICC2 (Max.) + PHS + PLS
PHS—High Side Switching Power Dissipation
PLS—Low Side Switching Power Dissipation
PHS = (VCC2 × QG × fPWM) × ROH(MAX)/(ROH(MAX) + RGH)/2
PLS = (VCC2 × QG × fPWM) × ROL(MAX)/(ROL(MAX) + RGL)/2
QG—IGBT Gate Charge at Supply Voltage
fPWM—LED Switching Frequency
ROH(MAX)—Maximum High Side Output Impedance—VOH(MIN)/IOH(MIN)
RGH—Gate Charging Resistance
ROL(MAX)—Maximum Low Side Output Impedance—VOL(MIN)/IOL(MIN)
RGL—Gate Discharging Resistance
Example:
ROH(MAX) = (VCC2 – VOH(MIN))/IOH(MIN) = 3V/0.75A = 4Ω
ROL(MAX) = VOL(MIN) / IOL(MIN) = 2.5V/1A = 2.5Ω
PHS = (20V × 1 μC × 10 kHz) × 4Ω/(4Ω + 10Ω)/2 = 28.57 mW
PLS = (20V × 1 μC × 10 kHz) × 2.5Ω/(2.5Ω + 10Ω)/2 = 20 mW
PO = 20 V × 13.6 mA + 28.57 mW + 20 mW = 320.57 mW
Calculation of Junction Temperature
LED Junction Temperature = 176.1 °C/W × 10 mW + 35.4 °C/W × 108 mW + 33.1 × 320.57 mW + TA = 16.2°C + TA
Input IC Junction Temperature = 35.4 °C/W × 10 mW + 92 °C/W × 108 mW + 25.6 × 320.57 mW + TA = 18.5°C + TA
Output IC Junction Temperature = 33.1 °C/W × 10 mW + 25.6 °C/W × 108 mW + 76.7 × 320.57 mW + TA = 27.7°C + TA
14


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Automotive 2.5A Gate-Drive Optocoupler

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4.2
4.1
4
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.2
–40 –20 0 20 40 60 80
TA—Temperature (°C)
Figure 8. ICC1 Across Temperature.
ICCL1
ICCH1
100 120 140
12
11.5
ICCL2
ICCH2
11
10.5
10
9.5
9
–40 –20 0
20 40 60 80
TA—Temperature (°C)
Figure 9. ICC2 Across Temperature.
100 120 140
100.00
10.00
TA = 25°C
1.00
0.10
0.01 1.2
Figure 10. IF vs. VF.
1.3 1.4 1.5
VF—Forward Voltage (V)
4
ITH+
3.5 ITH–
3
2.5
2
1.5
1
1.6
–50 –25 0
25 50 75 100 125
TA—Temperature (°C)
Figure 11. ITH Across Temperature.
20
19.5
19
18.5
18
17.5
17
0 0.5 1 1.5
IOH—Output High Current (A)
Figure 12. VOH vs. IOH.
–40°C
25°C
125°C
2 2.5
8
7 –40°C
6 25°C
5 125°C
4
3
2
1
0
01
Figure 13. VOL vs. IOL.
IOL —Ou2tput Low Curr3ent (A)
4
5
15


ACPL-344JT (AVAGO)
Automotive 2.5A Gate-Drive Optocoupler

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250
tPHL
200 tPLH
150
100
50
0
–50 –25
0 25 50 75
TA—Temperature (°C)
Figure 14. TP Across Temperature.
100 125
45
40
35
30
25
20
15
10
5
–40°C
25°C
125°C
0
0 5 10 15 20
VSSD—Soft Shutdown Voltage (V)
Figure 15. ISSD vs. VSSD.
25
7.4
7.2
7
6.8
6.6
6.4
6.2
6
–40 –20 0 20 40 60 80
TA—Temperature (°C)
Figure 16. VDESAT Threshold Across Temperature.
100 120 140
–0.7
–0.75
–0.8
–0.85
–0.9
–0.95
–1
–40 –20 0 20 40 60 80
TA—Temperature (°C)
Figure 17. ICHG Across Temperature.
100 120 140
70
60
50
40
30
20
10
0–40 –20 0 20 40 60 80
TA—Temperature (°C)
Figure 18. IDCHG Across Temperature.
100 120 140
16


ACPL-344JT (AVAGO)
Automotive 2.5A Gate-Drive Optocoupler

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Signal Source
Vsource
5V
0V
260Ω
RF
VEE1 VEE2
NC LED2+
VCC1 DESAT
NC VE
/UVLO VCC2
/FAULT
VO
AN SSD/CLAMP
CA VEE2
ACPL-344JT
Vo
10Ω
RG
CLOAD
10 nF
20V
VSOURCE
VO tPLH
50%
Figure 19. Propagation Delay Test Circuit.
tPHL
+
5V
130Ω
130Ω
VEE1 VEE2
NC LED2+
VCC1 DESAT
NC VE
/UVLO
/FAULT
VCC2
VO
AN SSD/CLAMP
CA VEE2
+–
High Voltage Pulse
VCM = 1500V
Figure 20. CMR Vo High Test Circuit.
0.1F_
+ 20V
10Ω
10 nF
Scope
130Ω
130Ω
VEE1 VEE2
NC LED2+
VCC1
NC
/UVLO
/FAULT
DESAT
VE
VCC2
VO
AN SSD/CLAMP
CA VEE2
+–
High Voltage Pulse
VCM = 1500V
Figure 21. CMR Vo Low Test Circuit.
0.1F
+
20V
10Ω
10 nF
Scope
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www.avagotech.com
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The term“Broadcom”refers to Broadcom Limited and/or its subsidiaries. For more information, please visit www.broadcom.com.
Data subject to change. Copyright © 2016 by Broadcom. All rights reserved.
AV02-4511EN - September 29, 2016
Lead (Pb) Free
RoHS 6 fully
compliant
RoHS 6 fully compliant options available;
-xxxE denotes a lead-free product




ACPL-344JT.pdf
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