NCP1072STAT3G(2012) 查看數據表（PDF） - ON Semiconductor

零件编号

产品描述 (功能)

生产厂家

NCP1072STAT3G
(Rev.:2012)

High-Voltage Switcher for Low Power Offline SMPS

ON Semiconductor 

NCP1072, NCP1075

PIN FUNCTION DESCRIPTION

Pin N5

Pin Name

Function

1

VCC

Powers the internal circuitry

2

NC

3

GND

4

FB

5

Drain

6

7

GND

8

GND

The IC Ground

Feedback signal input

Drain connection

The IC Ground

The IC Ground

Pin Description

This pin is connected to an external capacitor. The VCC includes an

active shunt which serves as an auto−recovery over voltage

protection.

By connecting an opto−coupler to this pin, the peak current set

point is adjusted accordingly to the output power demand.

The internal drain MOSFET connection

This un−connected pin ensures adequate creepage distance

Vcc

Vclamp

I

OVP

Vcc OVP

80−us

filter

Ipflag

SCP

tSCP

Jittering

OSC

LineOK

Sawtooth

Foldback

I

FBskip

SKIP

S

Q

Q

R

Vcc

Management

t recovery

LineOK

TSD

UVLO

OFF

UVLO

Reset

Vdd

OFF UVLO

line

detection

Vcc

DRV

S

Q

Q

R

Sawtooth

Ramp

compensation

Drain

GND

VFB(REF)

RFB(up)

FB

SKIP = ”1” −−> shut

down some blocks to

reduce consumption

I to CS setpoint

FB

I

FBfault

Ipflag

DRV Dynamic

LEB

+

−

Ifreeze Ipk(0)

Reset

+

−

Soft

Start

Reset SS as recovering from

SCP, TSD, Vcc OVP, or UVLO

Figure 3. Simplified Internal Circuit Architecture

http://onsemi.com

3

Share Link: