FUJITSU MB39A105 - Manual (Page 17)

MB39A105
17
■ ■ ■ ■ APPLICATION EXAMPLE
+ −
− + +
+ −
− +
A
A
R5
43 k
Ω
R6 330 k
Ω
R8 100 k
Ω
R7
22 k
Ω
R4
51 k
Ω
R11
100 k
Ω
R1 7.5 k
Ω
ON/OFF CTL (L : OFF, H : ON)
C9
0.1
µ F
C8
0.22
µ F
C4
4.7
µ F
C3
4.7
µ F
C2
4.7
µ
F
C1
0.1
µ F
L1
6.8
µ H
C5
4.7
µ F
C6
4.7
µ
F
C7
0.1
µ
F
D1
V
O
(9.0 V)
Q2
Q1
1 8 2
− INE FB
CSCP
VIN (1.8 V to 6.0 V)
7
RT Q3
6 5
GND OUT
4
3
SCPOD
VCC
VREF
VREF
Error Amp
SCP Comp.
PWM Comp.
Drive
Nch
I O
= 400 mA
at VCC
= 3.3 V
(0.5 V
± 1%)
± 10%
(1.0 V)
UVLO
OSC
SQ R
(0.9 V)
(0.7 V) (0.3 V)
bias
RT Current
VREF
Power
ON/OFF
CTL
VREF (1.27 V)
L : UVLO release