MB39A104
■ PIN DESCRIPTION
Pin No.
Symbol
VCCO
VH
I/O
Descriptions
1
2
3
4
Output circuit power supply terminal (Connect to same potential as VCC pin.)
Power supply terminal for FET drive circuit (VH = VCC − 5 V)
External Pch MOS FET gate drive terminal
O
O
I
OUT1
VS1
Overcurrent protection circuit input terminal
Overcurrent protection circuit detection resistor connection terminal. Set
overcurrent detection reference voltage depending on external resistor and
internal current resource (110 µA at RT = 24 kΩ)
5
ILIM1
I
I
PWM comparator block (PWM) input terminal. Compares the lowest voltage
among FB1 and DTC terminals with triangular wave and controls output.
6
7
DTC1
VCC
Power supply terminal for reference power supply and control circuit
(Connect to same potential as the VCCO terminal)
8
CSCP
FB1
Timer-latch short-circuit protection capacitor connection terminal
Error amplifier (Error Amp 1) output terminal
9
O
I
10
11
12
13
14
15
16
17
−INE1
CS1
RT
Error amplifier (Error Amp 1) inverted input terminal
Soft-start capacitor connection terminal
Triangular wave oscillation frequency setting resistor connection terminal
Triangular wave oscillation frequency setting capacitor connection terminal
Soft-start capacitor connection terminal
CT
CS2
−INE2
FB2
I
Error amplifier (Error Amp 2) inverted input terminal
Error amplifier (Error Amp 2) output terminal
O
O
VREF
Reference voltage output terminal
Output circuit ground terminal (Connect to same potential as GNDO
terminal.)
18
19
GND
PWM comparator block (PWM) input terminal. Compares the lowest voltage
among FB2 and DTC terminals with triangular wave and controls output.
DTC2
I
I
Overcurrent protection circit detection resistor connection terminal. Set
overcurrent detection reference voltage depending on external resistor and
internal current resource (110 µA at RT = 24 kΩ)
20
ILIM2
21
22
23
VS2
I
Overcurrent protection circuit input terminal
OUT2
GNDO
O
External Pch MOS FET gate drive terminal
Output circuit ground terminal (Connect to same potential as GND terminal.)
Power supply control terminal. Setting the CTL terminal at “L” level places IC
in the standby mode.
24
CTL
I
3
FUJITSU [ FUJITSU ]
