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MB3887
5
■
BLOCK DIAGRAM
+
−
−
+
8
10
13
12
9
+
−
−
+
4
2
24
1
3
× 20
× 20
+
+
+
−
5
20
21
19
−
+
+
+
−
11
16
22
17 6 23
14
18
<Current Amp1>
<Error Amp1>
7
VREF
<Current Amp2>
<Error Amp2>
VREF
<Error Amp3>
VREF
VREF
VREF
5.0 V
4.2 V
10
µA
15
<SOFT>
2.5 V
1.5 V
<OUT>
<UVLO>
<OSC>
Bias
Voltage
<VH>
<REF> <CTL>
<PWM Comp.>
Drive
VCC
(V
CC − 6 V)
(VCC UVLO)
VCC
VCC
VCC
CTL
215 kΩ
35 kΩ
0.91 V
(0.77 V)
VREF
UVLO
4.2 V
bias
−INC2
OUTD
FB2
OUTC2
VREF
−INE2
+INE2
+INE1
FB1
OUTC1
−INE1
−INC1
+INC2
GND
CS
VCC (O)
OUT
VH
RT
−INE3
FB3
+INC1
45 pF