Fujitsu MB39A104 manual Equivalent Circuit

MB39A104

■I/O EQUIVALENT CIRCUIT

〈〈Reference voltage block〉〉 〈〈Control block〉〉

〈〈Soft-start block〉〉

VCC 7

GND 18

1.24 V	+
	−
	77.8
	kΩ
	24.8
	kΩ

CTL 24

17VREF

GND

72 kΩ

104 kΩ

VREF	VCC
(5.0 V)
	CSX
GND

〈〈Short-circuit detection block〉〉

VREF
(5.0 V)
2 kΩ	CSCP
8
GND

〈〈Triangular wave oscillator			〈〈Triangular wave oscillator
	block (RT) 〉〉	VCC	(CT) block〉〉
(3.1 V)			(3.1 V)
1.35 V	+		CT 13
	−
		12 RT
GND			GND

〈〈Error amplifier block (CH1, CH2) 〉〉 〈〈Overcurrent protection circuit block〉〉

VCC
VREF
(5.0 V)
−INEX	CSX
	1.24 V	FBX
GND
〈〈PWM comparator		〈〈Bias voltage block〉〉
block (CH1, CH2) 〉〉

VCC	VCCO
ILIMX	VSX
GND	GNDO
	〈〈Output block (CH1, CH2) 〉〉

VCC

FBX

DTCX

GND

VCC	VCCO
CT
2	VH
GND	GNDO

VCCO	1
VH
GNDO 23

X : Each channel No.

21