BD9217F Datasheet, PDF (3/5 Pages) Rohm – Silicon Monolithic Integrated Circuit

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〇Package Dimensions
DEVICE MARK
BD9217F
BD9217FV
Lot No.
SOP24(unit:mm)
SSOP-B24(unit:mm)
〇Block Diagram
VCC
REG
SEL
CLKIN
RT
BRT BCT
DUTY
REG
BLOCK
OSC
BLOCK
STB
STB
SYSTEM　ON/OFF
BLOCK
SS
FB
IS
F/B
BLOCK
VS
SS
PWM
BLOCK
CT
BOSC
BLOCK
DUTY
BLOCK
LOGIC
BLOCK
REG
P1
N1
OUTPUT
BLOCK
P2
N2
PROTECT
BLOCK
GND
VCC
UVLO
ブロック
COMP CP
SRT
UVLO
FAIL
PGND
○Pin Description
PIN
No.
PIN NAME
1
PGND
2
N2
FUNCTION
Power Ground for FET drivers
NMOS FET driver (Channel 2 side)
PIN
No.
PIN NAME
13 CP
14 FAIL
3
P2
PMOS FET driver (Channel 2 side)
15 SEL
4
UVLO
5
CLKIN
6
RT
7
SRT
8
GND
9
BCT
10 BRT
11 DUTY
12 STB
Input of Under Voltage Lock Out
16 VS
CT Synchronous signal input
17 IS
External resistor between RT and GND for adjustment
frequency of saw tooth wave。
18
FB
External resistor between SRT and RT for adjustment
frequency of kick-off
19
SS
Ground
20 REG
External capacitor between BCT and GND for adjusting
the BURST triangle oscillator
21 COMP
External resistor between BRT and GND for adjustment
frequency of Burst dimming
22
VCC
Control Burst-dimming by PWM signal or DC
23 P1
Stand-by switch
24 N1
FUNCTION
External capacitor between CP and GND for timer latch
Error Indication output pin Normal : H, Error : L
Selector pin for external syncro-mode frequency
REG(Pin 20) :
Pull-up fin=Fout(DUTY=50%), Gnd-short : fin=Fout x 2
Error amplifier input 1
Error amplifier input 2
Error amplifier output
External capacitor between SS and GND for Soft Start
Control
and detect the time of Soft Start
regulator output
Input of over voltage detector
Power supply input with UVLO Protection
PMOS FET driver (Channel 1 side)
NMOS FET driver (Channel 1 side)
REV. C