FUJITSU MB39A104 - Manual (Page 3)

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