BD9241F Datasheet, PDF (3/5 Pages) Rohm – Silicon Monolithic Integrated Circuit

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○Dimensional outline drawing
(The max dimension with burr：11.55)
Item No
BD9241
1
Lot No.
○ Block diagram
SOP18 (Unit:mm)
STB
block
F/B
block
Reg
block
Internal
REG(5V)
PWM
block
Logic
block
Out
put
block
Protection
block
Output
block
○Terminal description
Terminal
No
Terminal
name
Function
1
N2
External FET drive circuit output terminal
2
P2
External FET drive circuit output terminal
3
VCC
Power terminal
4
SEL
Dimming(POS,NEG)select terminal
5
CP
Timer ー latch setting capacity connection
terminal
6
GND
GROUND
Connecting terminal for charging and
7
SRT
discharging current setting resistance of OSC
block
Connecting terminal for charging and
8
RT
discharging current setting resistance of OSC
block
9
VS
Error amplifier input terminal②
10
IS
Error amplifier input terminal①
11
FB
Error amplifier output terminal
12
COMP Over-voltage detecting terminal
Connecting terminal for charging and
13
BCT
discharging current setting capacity of BOSC
block.
14
DUTY
Switching terminal of PWM mode and burst
mode
15
STB
Standby switch terminal
16
PGND External FET drive circuit GND terminal
17
P1
External FET drive circuit output terminal
18
N1
External FET drive circuit output terminal
REV. A