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부품번호 | BD7683FJ-LB 기능 |
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기능 | Low Noise Quasi-Resonant Control DC/DC converter IC | ||
제조업체 | ROHM Semiconductor | ||
로고 | |||
전체 30 페이지수
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 structure:Silicon monolithic integrated circuit
.www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no designed protection against radioactive rays
1/27
TSZ02201-0F1F0A200050-1-2
17.Apr.2015. Rev.001
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 kΩ
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
Ω
tMASK
RMASK
0.25
20
0.60
50
0.95 µs
80 Ω
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.
TSZ22111・15・001
4/27
TSZ02201-0F1F0A200050-1-2
17.Apr.2015. Rev.001
4페이지 BD768xFJ-LB Series
Datasheet
(3) VCC Pin Protection Function
BD768xFJ includes the VCC low voltage protection function VCC UVLO (Under Voltage Protection) and the VCC
over voltage protection function VCC OVP (Over Voltage Protection). These functions prevent abnormal
voltage-related damage in MOSFETs used for switching.
The VCC UVLO function uses an auto recovery type comparator with voltage hysteresis and the VCC OVP
function uses latch mode or auto recovery.
After latch function is detected by VCCOVP, latching is released (reset) when the condition VCC< VLATCH (typ=
VUVLO2 -3.5V) is met.
This operation is shown in Figure 3.
VCCOVP has a built-in mask time TLATCH (typ = 150 µs).
This function masks any surges, etc., that occur at the pin.
VH
18.5Vtyp
VCC
Vlatch=
VCCuvlo2-
3.5Vtyp
VCC UVLO
VCC OVP
OUT
Switching
14.0Vtyp
ON ON
OFF
ON
OFF
OFF
OFF
OFF
ON
Internal
Latch Signal
29.5Vtyp
ON
OFF
OFF
L : Normal
H : Latch
Time
A B C DE
FG
HI
J K LM NA
Time
Figure 3. VCC UVLO / OVP (Latch Mode)
A: VH is applied, VCC voltage rises
B: When VCC > VUVLO1, DC/DC operation starts.
C: When VCC < VUVLO2, DC/DC operation stops.
D: When VCC > VUVLO1, DC/DC operation starts.
E: VCC voltage drops until DC/DC operation starts.
F: VCC rises.
F: When VCC > VOVP1, DC/DC operation stops (latch mode). Switching is stopped by an internal latch signal.
G: When DC/DC operation stops, power supply from the auxiliary coil stops and VCC voltage drops.
H: When VCC < VUVLO2, VCC voltage rises because IC current consumption drops.
I: When VCC > VUVLO1, latching occurs and so there are no DC/DC operations. VCC voltage drops because IC
current consumption is lowered.
K: Same as H
L: Same as I
M: VH is OPEN (unplugged). VCC drops.
N: When VCC < VLATCH, latch is released.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
7/27
TSZ02201-0F1F0A200050-1-2
17.Apr.2015. Rev.001
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부품번호 | 상세설명 및 기능 | 제조사 |
BD7683FJ-LB | Low Noise Quasi-Resonant Control DC/DC converter IC | ROHM Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |