Fujitsu MB3878 manual Application Example, OUTC2

17

R14

1.3 kΩ

R16 R15

200 kΩ 110 Ω

Q2

SW

	R8
	100 kΩ −INE1 8
		OUTC1 10
C10 5600 pF
R9	A	+INC1 13
		−INC1 12
10 kΩ	B
R12
30 kΩ		+
R13		INE1 9
		FB1 7
30 kΩ
C8		−INE2 4
10000 pF

	R10	OUTC2 2
R4	30 kΩ	+INC2 24
	R11
82 kΩ
R5	30 kΩ	−INC2 1
330 kΩ		+INE2 3
R6
68 kΩ		FB2 5
	R7
	22 kΩ
	R18
	200 kΩ	−
		INE3 16
	C6	R17
	1500 pF	100 kΩ
	R3	11
	330 kΩ	OUTD
		FB3 15
	CS	CS 22
	2200 pF

<Current Amp.1>	<Error	VREF
+	Amp.1>
⋅ 25	−						IIN
−					VCC (O)			VIN
	+
					21				AC Adaptor
						+
		<PWM Comp.>			C5		C1
					0.1 ∝F	−
		+	<OUT>				22	∝F	A B
					OUT
		+
		+		Drive	20	Q1
		−						I1	BATT

<Current Amp.2>	<Error	VREF	VCC			L1			RS
+	Amp.2>				D1	12	∝H		0.033	Ω
	−						+	+
⋅ 25				19	VH				Battery
−	+		Bias				−	−
			Voltage	(VCC − 5 V)			C2	C3
			<VH>			100 ∝F		100 ∝F

Output voltage (Battery voltage) is adjustable

						2.5 V
						1.5 V
			<UVLO>			VCC
	<Error
		VREF
	Amp.3>		(VCC UVLO) 215 kΩ
	−
				+
	+
	+			−	35 kΩ
	4.2 V			0.91 V
				(0.77 V)
<SOFT>				VREF
				UVLO
VREF
	∝A
1
					VCC		VCC
			bias
							18
								C7
							CTL		∝F
								0.1
		<OSC>	<REF>		<CTL>		14
	(45 pF)			VREF
		17	6	5.0 V		23
		RT	VREF	GND
		RT					Note : SW ON : DCC MODE
		47 kΩ		C9				SW OFF : Dead Battery MODE
				0.1 ∝F				Range of input voltage

VIN=13V to 21V(at Load = 3A)

■ APPLICATION EXAMPLE 1

MB3878