参数资料
型号: BD9775FV-E2
厂商: Rohm Semiconductor
文件页数: 20/30页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM 28-SSOP
标准包装: 1
PWM 型: 控制器
输出数: 1
频率 - 最大: 550kHz
占空比: 48%
电源电压: 6 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 28-LSSOP(0.220",5.60mm)
包装: 标准包装
产品目录页面: 1373 (CN2011-ZH PDF)
其它名称: BD9775FV-E2DKR
● Pin Description
● PinNo/PinName (BD9775FV)
1
FB1
VS1 28
(BD9775FV)
2
INV1
CL1 27
Pin
No.
Pin
Name
Description
3
RT
PVCC1 26
1
FB1
Error amplifier output pin ( Channel 1 )
4
CT
OUT1 25
2
INV1
Error amplifier negative input pin ( Channel 1 )
5
Fin
VREGB 24
6
7
GND
VREF
OUT2H 23
PVCC2 22
3
4
RT
CT
Oscillator frequency adjustment pin
connected resistor
Oscillator frequency adjustment pin
connected capacitor
8
9
10
DTC1
DTC2
INV2
CL2
VS2
SCP
21
20
19
5
6
7
FIN
GND
VREF
Oscillator synchronization pulse signal input pin
Low-noise ground
Reference voltage output pin
11
12
13
14
FB2
CTL1
CTL2
VCC
VREGA 18
OUT2L 17
PGND 16
SYNC 15
8
9
10
DTC1
DTC2
INV2
Maximum duty and soft start adjustment
pin ( Channel 1 )
Maximum duty and soft start adjustment
pin ( Channel 2 )
Error amplifier negative input pin ( Channel 2 )
11
FB2
Error amplifier output pin ( Channel 2 )
● Block Diagram (BD9775FV)
Fig.1
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
CTL1
CTL2
VCC
SYNC
PGND
OUT2L
VREGA
SCP
VS2
CL2
PVCC2
OUT2H
VREGB
OUT1
PVCC1
CL1
VS1
Enable/stand-by control input ( Channel 1 )
Enable/stand-by control input ( Channel 2 )
Main power supply pin
Synchronous rectification timing adjustable pin
Power ground (connected low-side gate driver
and digital ground)
Low-side ( synchronous rectifier ) gate driver
output pin ( Channel 2 )
Connected capacitor for internal regulator
Delay time of short circuit protection adjustment
pin connected capacitor
Over current detection voltage monitor pin
( connected FET drain, Channel 2 )
Over current detection voltage adjustment pin
connected capacitor and resistor ( Channel 2 )
High-side gate driver power supply
input ( Channel 2 )
High-side gate driver output pin ( Channel 2 )
Connected capacitor for internal regulator
High-side gate driver output pin ( Channel 1 )
High-side gate driver power supply
input ( Channel 1 )
Over current detection voltage adjustment pin
connected capacitor and resistor ( Channel 1 )
Over current detection voltage monitor pin
( connected FET drain, Channel 1 )
● FUNCTION EXPLANATION (BD9775FV)
1.DC/DC Converter
? Reference Voltage
Stable voltage of compensated temperature, is generated from the power supply voltage (VCC). The reference voltage is 3.0V,
the accuracy is ± 1 % . Place a capacitor with low ESR (several decades m Ω ) between VREF and GND.
? Internal Regulator A ( VREGA )
5V is generated the power supply voltage. The voltage is for the driver of the synchronous rectification’s MOSFET. Place a
capacitor with low ESR (several decades m Ω ) between VREGA and PGND.
20/29
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