Fujitsu MB3788 manual Block Diagram

MB3788
■ BLOCK DIAGRAM
									Cb1
	Channel 1							4
								5	Ca1
+IN1 (E)	8	+	Error amplifier 1			OFF current setting		1	VCC(out)
					PWM comparator 1
				+
		-
-IN1 (E)	7
				-
								2	OUT1
FB1	6
		+	Comparator 1					3
	0.6 V	-					1.5 V		VE1
-IN1 (C)
	9
									Ca2
	Channel 2							20
								21	Cb2
+IN2 (E)	17	+	Error amplifier 2			OFF current setting
					PWM comparator 2
				+
		-
-IN2 (E)	18
				-
								23	OUT2
FB2 19
		+	Comparator 2					22
	0.6 V	-					1.5 V		VE2
-IN2 (C)
	16
	SCP comparator -							14	CTL2
			-				1.9 V
Timer circuit			+
							1.3 V
				2.1 V
	1 ∝A
SCP	15			VREF				11	VCC
			SR latch	Low input		Reference	Power/channel
					voltage
						voltage	ON/OFF	13	CTL1
			circuit	protection
						power (2.5 V)	circuit
					circuit
					10	12	24
					-IN(PWM)	VREF	GND

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