MB39A104
■ I/O EQUIVALENT CIRCUIT
Reference voltage block
Control block
Soft-start block
VREF
(5.0 V)
VCC
CSX
7
VCC
24
CTL
+
−
1.24 V
72
kΩ
VREF
17
77.8
kΩ
104
kΩ
24.8
kΩ
GND
GND
18
GND
Triangular wave oscillator
block (RT)
Triangular wave oscillator
(CT) block
Short-circuit detection block
VCC
VREF
(5.0 V)
(3.1 V)
(3.1 V)
2 kΩ
+
−
1.35 V
CT
13
CSCP
8
RT
12
GND
VCC
GND
GND
Overcurrent protection circuit block
Error amplifier block (CH1, CH2)
VCCO
VCC
ILIMX
VSX
VREF
(5.0 V)
−INEX
CSX
1.24 V
FBX
GND
GND
GNDO
PWM comparator
block (CH1, CH2)
Bias voltage block
Output block (CH1, CH2)
VCC
VCC
VCCO
VCCO
1
O
FBX
CT
VH
DTCX
2
VH
23
GNDO
GND
GND
GNDO
X : Each channel No.
21
FUJITSU [ FUJITSU ]
