BD7684FJ-LB Datasheet PDF - Rohm

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BD7684FJ-LB
Rohm

Part Number BD7684FJ-LB
Description Low Noise Quasi-Resonant Control DC/DC converter IC
Page 30 Pages


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Datasheet
Low Noise Quasi-Resonant Control
DC/DC converter IC for AC/DC Converter
BD7682FJ-LB BD7683FJ-LB BD7684FJ-LB BD7685FJ-LB
General Description
This is the product guarantees long time support in the
Industrial market.
BD768xFJ series is a Quasi-resonant controller type
DC/DC converters that provide an optimum system for
all products that include an electrical outlet.
Quasi-resonant operation enables soft switching and
helps to keep EMI low. Design with a high degree of
flexibility is achieved with switching MOSFETs and
current detection resistors as external devices.
The built-in brown out function monitors the input
voltage as part of system optimization. The burst mode
function reduces input power at low power.
BD768xFJ series include various protection functions,
such as a soft start function, burst function, per-cycle
over-current limiter function, overvoltage protection
function, overload protection function, and brown out
function.
BD768xFJ series include a gate-clamp circuit for
optimal driving SIC-MOSFET.
Features
Pin 8 : SOP-J8 Package
(6.00mm × 4.90mm : 1.27mm pitch <TYP>)
Quasi-resonant type (low EMI)
Frequency reduction mode
Low current consumption (19µA), during standby
Low current consumption when no load (burst
operation when light load)
Maximum frequency (120kHz)
CS Pin Leading-Edge Blanking
VCC UVLO (Under Voltage Drop Out protection)
VCC OVP (Over Voltage Protection)
Per-cycle over-current protection circuit
Soft start
ZT trigger mask function
Voltage protection function (brown out)
ZT OVP (Over Voltage Protection)
Gate-clamp circuit
Key Specifications
Operating Power Supply Voltage Range:
VCC 15.0V to 27.5V
Normal Operating Current:
0.80mA(Typ)
Burst Operating Current:
0.50mA(Typ)
Maximum Frequency:
120kHz(Typ)
Operating Temperature:
-40°C to +105°C
Package 4.90mm x 6.00mm x 1.65mm pitch 1.27mm
(Typ.) (Typ.)
(TYP.)
(TYP.)
SOP-J8
4.90mm x 6.00mm x 1.65mm
Lineup
BD7682FJ
BD7683FJ
BD7684FJ
BD7685FJ
FBOLP
AutoRestart
Latch
AutoRestart
Latch
VCCOVP
Latch
Latch
AutoRestart
AutoRestart
Applications
Industrial equipment, AC Adaptor, Household appliances
Typical Application Circuit
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has no designed protection against radioactive rays
1/27
TSZ02201-0F1F0A200050-1-2
17.Apr.2015. Rev.001



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BD768xFJ-LB Series
Pin Descriptions
No. Pin Name
1 ZT
2 FB
3 CS
4 GND
5 OUT
6 MASK
7 VCC
8 BO
I/O Function
I Zero Current Detect pin
I Feedback signal input pin
I Current Sense pin
I/O GND pin
O MOSFET drive pin
O External TR drive
I Power Supply pin
O Brown IN/OUT monitor pin
Block Diagram
ESD Diode
VCC GND
-
✓✓
✓✓
-
✓✓
-
-
-
Datasheet
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
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TSZ02201-0F1F0A200050-1-2
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BD768xFJ-LB Series
Datasheet
Absolute Maximum Ratings (Ta= 25 °C)
Parameter
Maximum Applied Voltage 1
Symbol
Vmax1
Rating
-0.3 to +32.0
Unit Conditions
V OUT, VCC, MASK
Maximum Applied Voltage 2
Vmax2
-0.3 to +6.5
V ZT, CS, FB, BO
Maximum Applied Voltage 3
Vmax3
-0.3 to +25.0
V OUT
ZT Pin Maximum Current1
ISZT1
-3.0 mA
ZT Pin Maximum Current2
Power Dissipation
ISZT2
Pd
3.0
676 (Note1)
mA
W
Operating Temperature Range
Topr
-40 to +105
°C
MAX Junction Temperature
Tjmax
150
°C
Storage Temperature Range
Tstr
-55 to +150
°C
(Note1) SOP8 : When mounted (on 70 mm × 70 mm, 1.6 mm thick, glass epoxy on single-layer substrate)
De-rated by 5.4mW/°C when operating above Ta=25°C.
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Recommended Operating Conditions (Ta=25 C)
Parameter
Symbol
Power Supply Voltage Range
VCC
Rating
15.0 to 27.5
Unit Conditions
V VCC pin voltage
Electrical Characteristics (unless otherwise noted, Ta = 25 °C, VCC= 24 V)
Parameter
Symbol
Specifications
MIN TYP MAX
[Circuit Current]
Circuit Current (OFF)
IOFF
10
19
30
Circuit Current (ON) 1
ION1 300
800 1500
Circuit Current (ON) 2
Circuit Current (Protect circuit is on)
[Brown Out Block (B.O.)]
B.O. Detection Voltage
B.O. Detection Hysteresis Current
[VCC Pin Protection Functions]
VCC UVLO Voltage 1
VCC UVLO Voltage 2
VCC UVLO Hysteresis
VCC OVP Voltage 1
VCC OVP Voltage 2
VCC OVP Hysteresis
Latch Release Voltage
Latch Mask Time
ION2
Iprotect
150
800
500
1600
1000
2200
VBO 0.920
IBO 10
1.000
15
1.080
20
VUVLO1
VUVLO2
VUVLO3
VOVP1
VOVP2
VOVP3
VLATCH
tLATCH
19.00
13.00
-
27.50
21.00
-
-
50
19.50
14.00
5.50
29.50
23.00
6.50
VUVLO2-3.5
150
20.00
15.00
-
31.50
25.00
-
-
250
Unit Conditions
µA
VCC=18.0V
(VCC UVLO=Disable)
µA
FB=1.0V
(at pulse operation)
µA
FB=0.0V
(at burst operation)
µA FBOLP,VCCOVP,ZTOVP
V
µA
V VCC rise
V VCC fall
V VUVLO3= VUVLO1-VUVLO2
V VCC rise
V VCC fall
V VOVP3= VOVP1-VOVP2
V VCC voltage
µs
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
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TSZ02201-0F1F0A200050-1-2
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BD768xFJ-LB Series
Datasheet
Electrical Characteristics – continued (unless otherwise noted, Ta = 25 °C, VCC=24 V)
Parameter
Symbol
Specifications
MIN TYP MAX
Unit
[DCDC Converter Block (Turn OFF)]
FB Pin pull-up Resistance
RFB 15
20
25 k
CS Over-Current Sensor Voltage 1A
CS Over-Current Sensor Voltage 1B
VLIM1A
VLIM1B
0.950
0.620
1.000
0.700
1.050
0.780
V
V
CS Over-Current Sensor Voltage 2A
CS Over-Current Sensor Voltage 2B
VLIM2A
VLIM2B
0.200
0.140
0.300
0.210
0.400
0.280
V
V
CS Switching ZT Current
CS Leading Edge Blanking Time
IZT
0.900
1.000
tLEB - 0.250
1.100
-
mA
µs
Minimum ON Width
tMIN - 0.500 - µs
[DCDC Converter Block (Turn ON)]
Maximum Operating Frequency 1
Maximum Operating Frequency 2
fSW1
fSW2
106
20
120
30
134 KHz
40 KHz
Frequency Reduction Start FB Voltage
Frequency Reduction End FB Voltage 1
VFBSW1
VFBSW2
1.100
0.400
1.250
0.500
1.400
0.600
V
V
Frequency Reduction End FB Voltage 2
Voltage Gain
VFBSW3
AVCS
-
1.700
0.550
2.000
-
2.300
V
V/V
ZT Comparator Voltage 1
ZT Comparator Voltage 2
VZT1
VZT2
60
120
100
200
140 mV
280 mV
ZT Trigger Mask Time
tZTMASK
0.25
0.60
0.95 µs
ZT Trigger Timeout Period 1
tZTOUT
8.0
15.0
24.0 µs
ZT Trigger Timeout Period 2
Maximum ON Time
[DCDC Protection Functions]
Soft Start Time 1
Soft Start Time 2
FB OLP Voltage 1
FB OLP Voltage 2
FB OLP Timer
ZT OVP Voltage
[OUT Pin]
OUT Pin Clamp Voltage
OUT pin Nch MOS Ron
[MASK Pin]
MASK Pin Delay Time
MASK Pin Ron
tZTOUT2
tZTON
2.0
27.0
5.0
45.0
8.0 µs
62.0 µs
tSS1
tSS2
VFOLP1
VFOLP2
tFOLP
VZTL
0.600
2.400
2.500
2.300
90
3.250
1.000
4.000
2.800
2.600
128
3.500
1.400
5.600
3.100
2.900
166
3.750
ms
ms
V
V
ms
V
VOUT
RNOUT
16.00
2.0
18.00
4.5
20.00
9.0
V
tMASK
RMASK
0.25
20
0.60
50
0.95 µs
80
Conditions
FB=2.2V (IZT>-1mA)
FB=2.2V (IZT<-1mA)
FB=0.6V (IZT>-1mA)
FB=0.6V (IZT<-1mA)
FB=2.0V
FB=0.5V
VFB/VCS
ZT fall
ZT rise
For noise prevention
after OUT H L
Count from final ZT
trigger (1-stage)
Count from final ZT
trigger (2-stage)
FB rise
FB fall
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/27
TSZ02201-0F1F0A200050-1-2
17.Apr.2015. Rev.001



BD7684FJ-LB datasheet pdf
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BD7684FJ-LB Low Noise Quasi-Resonant Control DC/DC converter IC BD7684FJ-LB
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BD7684FJ-LB pdf

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