HT2811H

2/8

High performance primary sensing regulator (PSR)

www.hotchip.com.cn

Ver1.0

PIN DEFINITION

SOP5

Pin

Name

Pin #

Description

VCC

1

Power supplying pin of the controller, In order to let

the controller gain more Stable supply voltage, the

external filter capacitor must use low equivalent im

-pedance (Low ESR) of the electrolytic capacitor.

FB

2

Output feedback pin, to detect the output condition

through the auxiliary wind-ing voltage of the

transformer

CS

3

Connect external primary current sensing resistor RCS,

the controller can detect the primary current through the

external sense resistor. When the voltage on the resistor

achieves the maximum value, the internal power BJT

will be turn off immediately

HV

4

To connect the collector of internal power BJT

GND

5

The referring grounding pin of the controller

Ovp

&

osp

Regulator

&

Blas

Tonsec

Detector

CV

cortrol

Drive

Control

CC

Control

Noise

suppressi

on

AC Voltage

Compensation

VCC

FB

Startup&unlo

pmf

Tons

3v

Logic

Tons

Buffer

Noise

Suppressio

n

Cable

Compensation

Peak current

control&Leb

GND

CS

HV

FUNCTIONAL BlOCK DIAGRAM

1

2

3

5

4

HV

VCC

CS

FB

GND