参数资料
型号: BD9851EFV-E2
厂商: Rohm Semiconductor
文件页数: 7/17页
文件大小: 0K
描述: IC REG CTRLR BST INV HTSSOP-B20
标准包装: 1
PWM 型: 控制器
输出数: 2
频率 - 最大: 3MHz
电源电压: 4 V ~ 18 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: 20-VSSOP(0.173",4.40mm 宽)
包装: 标准包装
产品目录页面: 1373 (CN2011-ZH PDF)
其它名称: BD9851EFV-E2DKR
Block diagram / Pin assignment
(BD9850FVM)
Vcc
Vcc
1
V REF
4
RT
8
U.V.L.O
V REF
TRI
Vcc
Vcc
INV
5
1.0V
Error Amp
Clamper
V REF
PWM COMP
2
OUT
Vo
FB
6
T.S.D
7
CTL/SS
Fig.13 BD9850FVM Block diagram
GND
3
(BD9851EFV)
Vcc
Vcc
Pin No.
1
2
3
4
5
6
7
8
Pin name
Vcc
OUT
GND
V REF
INV
FB
CTL /SS
RT
Function
Power supply
FET driver drive output
Ground
Reference voltage (2.5V±1%) output
Error Amp inverting input
Error Amp output
Control/Soft start common
Oscillation frequency setting resistor connection
18
Pin No.
Pin name
Function
V REF
17
V REF
(2.5V)
Both channels
ON/OFF
19 STB
1
SEL1
CH1 drive FET setting (Vcc short: P-ch drive, GND short: N-ch drive)
Vo1
FB1
15
1
Vcc
SEL1
2
3
RT
CT
Oscillation frequency setting resistor connection
Oscillation frequency setting capacitor connection
PVcc1
Vcc
4
NON2
Error Amp non-inverting input (CH2)
12
V REF
INV1
16
+
1V
+
OUT1
11
Vo1
5
6
7
INV2
FB2
DTC2
Error Amp inverting input (CH2)
Error Amp output (CH2)
Maximum duty/soft start setting (CH2)
DTC1
13
8
PV CC 2
FET driver block power supply input (CH2)
+
+
PGND
9
OUT2
FET driver block output (CH2)
10
Vo2
FB2
6
2.3V
Vcc
10
PGND
FET driver block ground
PVcc2
11
OUT1
FET driver block output (CH1)
V REF
V REF
INV1
NON2
DTC2
5
4
7
+
+
8
OUT2
9
Vo2
12
13
14
PV CC 1
DTC1
SCP
FET driver block power supply input (CH1)
Maximum duty/soft start setting (CH1)
Short circuit protection timer setting capacitor connection
RT
2
15
FB1
Error Amp output (CH1)
CT
3
OSC
16
INV1
Error Amp inverting input (CH1)
SCP 14
Tmer
Latch
GND
20
17
18
VR EF
V CC
Reference voltage (2.5V±1%) output
Power supply input
19
STB
ON/OFF control
Fig.14 BD9851EFV Block diagram
20
GND
FIN on
reverse
Ground
Make FIN on the reverse open or ground to GND (pin 20)
(However, open FIN on the reverse will degrade radiation performance.)
7/16
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