MB3778 Просмотр технического описания (PDF) - Fujitsu

Номер в каталоге

Компоненты Описание

Список матч

MB3778

Switching Regulator Controller

Fujitsu 

MB3778

■ PIN DESCRIPTION

No.

Pin

Function

1

CT Oscillator timing capacitor terminal (150 pF to 15,000 pF) .

2

RT

Oscillator timing resistor terminal (5.1 kΩ to 100 kΩ) .

VREF × 1/2 voltage is also available at this pin for error amplifier reference input.

3

+IN1 Error amplifier 1 non-inverted input terminal.

4

−IN1 Error amplifier 1 inverted input terminal.

Error amplifier 1 output terminal.

5

FB1 A resistor and a capacitor are connected between this terminal and the −IN1 terminal to adjust

gain and frequency.

OUT1 dead-time control terminal.

6

DTC1 Dead-time control is adjusted by an external resistive divider connected to the VREF pin.

A capacitor connected between this terminal and GND enables soft-start operation.

Open collector output terminal.

7

OUT1 Output transistor has common ground independent of signal ground.

This output can source or sink up to 50 mA.

8 E/GND Ground terminal.

9

VCC Power supply terminal (3.6 V to 18 V)

Open collector output terminal.

10 OUT2 Output transistor has common ground independent of signal ground.

This output can source or sink up to 50 mA.

11

DTC2

Sets the dead-time of OUT2.

The use of this terminal is the same as that of DTC1.

Error amplifier 2 output terminal.

Sets the gain and adjusts the frequency when a resistor and a capacitor are connected

12

FB2 between this terminal and the −IN2 terminal.

Voltage of VREF × 1/2 voltage is internally connected to the non-inverted input of error amplifier

2. Uses error amplifier 2 for positive voltage output.

13

−IN2 Error amplifier 2 inverted input terminal.

Power control terminal.

14

CTL

The IC is set in the stand-by state when this terminal is set “Low.”

Current consumption is 10 µA or lower in the stand-by state.

The input can be driven by TTL or CMOS.

The time constant setting capacitor connection terminal of the timer latch short-circuit

protection circuit.

15

SCP Connects a capacitor between this pin and GND.

For details, see “■ HOW TO SET TIME CONSTANT FOR TIMER LATCH SHORT-CIRCUIT

PROTECTION CIRCUIT”.

16

VREF

2.46 V reference voltage output terminal which can be obtained up to 1 mA.

This pin is used to set the reference input and idle period of the error amplifiers.

3

Share Link: