PN8370

Chipown

13/F, Building C, Wangzhuang Technology Innovation Center, Longshan Road,New District, Wuxi

Tel: +86(510)85217718 http://www.chipown.com.cn

Rev.A.1507 1 / 10

Low Standby-Power Quasi-Resonant Primary-Side Converter

General Description

The PN8370 consists of a Low Standby-Power Quasi-Resonant (QR) Primary-Side controller and a 650V avalanche-rugged smart

power VDMOSFET, specifically designed for a high performance AC/DC charger or adaptor with minimal external components.

PN8370 operates in primary-side sensing and regulation, so opto-coupler and TL431 could be eliminated. Because of internal HV

Start-up circuit, the system with PN8370 can achieve less than 30mW standby power consumption (230VAC). In CV mode,

multi-mode and quasi resonant technique is utilized to achieve high efficiency, avoid audible noise and make the system meeting

Energy star class VI. Good load regulation is achieved by the built-in cable drop compensation. In CC mode, the current and output

power setting can be adjusted externally by the sense resistor at CS pin. PN8370 offers complete protections including Cycle-by-Cycle

current limiting protection (OCP), over voltage protection (OVP), over temperature protection (OTP) and CS open or short protection

(CSO/SP) etc.

Applications

■ Switch AC/DC Adaptor

■ Battery Charger

Features

■

Internal 650 V avalanche-rugged smart power VDMOSFET

■

Internal HV Start-up Circuit, Standby power consumption

< 30mW at 230VAC

■

Multi-mode and Quasi-Resonant technique achieve high

efficiency, meeting energy star class VI

■

±5% CC Regulation at Universal AC input

■

Primary-side Sensing and Regulation without TL431 and

Opto-coupler

■

Programmable Cable Drop Compensation

■

No-need Control Loop Compensation Capacitance

■

Excellent Protection Coverage:

Over Temperature Protection (OTP)

VDD Under/Over Voltage Protection(UVLO&OVP)

Cycle-by-Cycle Current Limiting (OCP)

Cs Short/Open Protection (CS O/SP)

Output Features

Package/Order Information

Typical power

Order codes

Package

85~265 VAC

PN8370SSC-R1

SOP7

12W

PN8370NEC-T1

DIP8

15W

Typical Application

Snubber

AC

85~265V

DC

Output

FB

GND

Cable

comp

CC/CV

control

OTP

Block

HV

Startup

PW M Switch

&Gate Driver

SUPPLY

&UVLO

VDD

SW

PN8370

OCP

CS