NCP1378DR2 查看數據表（PDF） - ON Semiconductor

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NCP1378DR2

PWM Current−Mode Controller for Free−Running Quasi−Resonant Operation

ON Semiconductor 

Universal

Network

NCP1378

R*

OVP and NCP1378

+

Demag

1

8

2

7

3

6

4

5

12 V @ 1 A

+

GND

+

*Please refer to the application information section.

Y1 Type

Figure 1. Typical Application Schematic

PIN FUNCTION DESCRIPTION

Pin

Symbol

Function

1

Demag

Core reset detection and OVP

2

FB

Sets the peak current setpoint

3

CS

Current sense input and skip

cycle level selection

4

GND

5

Drv

6

VCC

7

NC

8

HV

The IC ground

Driving pulses

Supplies the IC

−

High−voltage pin

Description

The auxiliary FLYBACK signal ensures discontinuous operation and offers a

fixed overvoltage detection level of 5.2 V.

By connecting an optocoupler to this pin, the peak current setpoint is

adjusted accordingly to the output power demand. By bringing this pin below

the internal skip level, you shut off the device.

This pin senses the primary current and routes it to the internal comparator

via an L.E.B. By inserting a resistor in series with the pin, you control the

level at which the skip operation takes place.

−

The driver’s output to an external MOSFET.

This pin is connected to an external bulk capacitor of typically 47 mF.

This unconnected pin ensures adequate creepage distance.

Connected to the high−voltage rail, this pin injects a constant current into the

VCC bulk capacitor and ensures a clean lossless startup sequence.

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