BD9889FV_09 ROHM [Rohm], BD9889FV_09 Datasheet - Page 3

• Manufacturer Part Number: BD9889FV_09
• Description: Silicon Monolithic Integrated Circuit
• Manufacturer: ROHM [Rohm]

GND
STB
FB1
VS1
FB2
VS2
IS1
IS2
SS
〇Package Dimensions
〇Block Diagram
BLOCK
BLOCK
BLOCK①
BLOCK②
STB
VCC
REG
F/B
F/B
COMP1 COMP2
REG VREF
SYSTEM ON/OFF
PROTECT
BLOCK
SCP
CT
SS
CT
SS
SRT
１
BLOCK①
BLOCK②
PWM
PWM
CT
OSC
RT
BLOCK
UVLO
BRT BCT
BOSC
BLOCK
BLOCK
LOGIC
LOGIC
①
②
BD9889FV
SSOP-B28 (unit:mm)
VCC
BLOCK
DUTY
DUTY
OUTPUT
BLOCK①
BLOCK②
OUTPUT
VCC
VCC
REV. A
PGND
FAIL
UVLO
NA1
NB1
NA2
NB2
〇Pin Description
Pin No.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
Device Mark
COMP1
COMP2
Name
DUTY
VREF
FAIL
UVLO
PGND
Pin
BRT
BCT
SRT
GND
FB1
IS1
VS1
FB2
IS2
VS2
STB
REG
SCP
NA2
NB2
NB1
NA1
Vcc
RT
CT
SS
Control PWM mode and BURST mode
External resistor from BRT to GND for
adjusting the BURST triangle oscillator
External capacitor from BCT to GND for
adjusting the BURST triangle oscillator
External resistor from SRT to RT for
adjusting the triangle oscillator
External resistor from SRT to RT for
adjusting the triangle oscillator
External capacitor from CT to GND for
adjusting the triangle oscillator
GROUND
Error amplifier output①
Error amplifier input①
Error amplifier input②
Error amplifier output②
Error amplifier input③
Error amplifier input④
Reference voltage
Protect clock output
Stand-by switch
Over or under voltage detect for 1ch
Over or under voltage detect for 2ch
External Under Voltage Lock OUT
Internal regulator output
External capacitor from SS to GND for
Soft Start Control
External capacitor from SCP to GND for
Timer Latch
FET driver for 2ch
FET driver for 2ch
Ground for FET drivers
FET driver for 1ch
FET driver for 1ch
Supply voltage input
Function
3/4