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PIN DESCRIPTION
Pin No.
Symbol
1
INC2
2
OUTC2
3
INE2
4
INE2
5
FB2
6
VREF
7
FB1
8
INE1
9
INE1
10
OUTC1
11
OUTD
12
INC1
13
INC1
14
CTL
15
FB3
16
INE3
17
RT
18
VCC
19
VH
20
OUT
21
VCC (O)
22
CS
23
GND
24
INC2
I/O
I
Current detection amplifier (Current Amp. 2) input pin.
O
Current detection amplifier (Current Amp. 2) output pin.
I
Error amplifier (Error Amp. 2) non-inverted input pin.
I
Error amplifier (Error Amp. 2) inverted input pin.
O
Error amplifier (Error Amp. 2) output pin.
O
Reference voltage output pin.
O
Error amplifier (Error Amp. 1) output pin.
I
Error amplifier (Error Amp. 1) inverted input pin
I
Error amplifier (Error Amp. 3) non-inverted input pin.
O
Current detection amplifier (Current Amp. 1) output pin.
With IC in standby mode, this pin is left open to prevent loss of current
O
through output voltage setting resistance. Set CTL pin to "H" level and
OUTD pin to "L" level.
I
Current detector amplifier (Current Amp. 1) input pin.
I
Current detector amplifier (Current Amp. 1) input pin.
Power supply control pin.
I
Setting the CTL pin low places the IC in the standby mode.
O
Error amplifier (Error Amp. 3) output pin.
I
Error amplifier (Error Amp. 3) inverted input pin.
Triangular-wave oscillation frequency setting resistor connection pin.
Power supply pin for reference power supply and control circuit.
O
Power supply pin for FET drive circuit (VH = Vcc
O
High-side FET gate drive pin.
Output circuit power supply pin.
Soft-start capacitor connection pin.
Ground pin.
I
Current detection amplifier (Current Amp. 2) input pin.
MB3878
Descriptions
5 V).
3
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