NCP1072STBT3G 查看數據表（PDF） - ON Semiconductor

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NCP1072STBT3G

High-Voltage Switcher for Low Power Offline SMPS

ON Semiconductor 

NCP1070, NCP1071, NCP1072, NCP1075, NCP1076, NCP1077

PIN FUNCTION DESCRIPTION

Pin N5

Pin Name

Function

1

VCC

Powers the internal circuitry

2

NC

3

GND

The IC Ground

4

FB

Feedback signal input

5

Drain

6

7

GND

8

GND

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 200 ns

LEB

+

−

Ifreeze Ipk(0)

Reset

+

−

Soft

Start

Reset SS as recovering from

SCP, TSD, Vcc OVP, or UVLO

Figure 3. Simplified Internal Circuit Architecture

www.onsemi.com

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