Datasheet > iW873

iW873

更新时间： 2024-11-15 14:57:55

品牌	Logo	应用领域
瑞萨 - RENESAS		/
页数	文件大小	规格书
6页	453K
描述
Secondary-Side Synchronous Rectifier Controller with Integrated 60V MOSFET

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iW873 数据手册

iW873

Digital Green-Mode Synchronous Rectiﬁer

1 Description

The iW873 is a high performance synchronous rectiﬁer controller with integrated MOSFET and driver for ﬂyback

converters operating at discontinuous conduction mode. It emulates the diode rectiﬁer at the secondary side of the

ﬂyback to reduce conduction loss. The iW873 determines the timing of the driver by sensing the voltage across the

R_DS(ON)of the built-in MOSFET to achieve lossless sensing. Proprietary digital adaptive turn-oﬀ control technology

is used to minimize the turn-oﬀ deadtime of the synchronous rectiﬁer so that the parallel Schottky diode required by

conventional synchronous rectiﬁers can be eliminated. The integrated driver has strong driving capability for high

eﬃciency. The operating power consumption of the controller excluding the driver is less than 4mW at no load to achieve

the ultra-low no-load power consumption for 5V applications. The iW873 integrates a pulse linear regulator to maintain

the operation of the synchronous rectiﬁer at low system output voltage when the system is operating in constant current

(CC) mode.

2 Features

● Wide V_INpin operating voltage up to 25V

● Integrated 60V power MOSFET

● Intelligent low power management achieves ultra-low

no-load operating current

● Digital adaptive turn-oﬀ control minimizes dead-time

and eliminates the parallel Schottky diode

● Lossless MOSFET V_DSsensing for SR timing control

● 8-pin SOIC package

● Integrated pulse linear regulator (PLR) allows SR

operation at low system output voltage down to 2.4V in

typical 5V, 2A USB charger applications with iW873-00

3 Applications

● Compact AC/DC adapters/chargers for media tablets

and smart phones

OUT

iW873

V_IN

OUT

DRAIN

V_CC

RTN

DRAIN

GND

Figure 3.1 : iW873 Typical Application Circuit

Product Summary

02-Feb-2022

Rev. 1.1

www.renesas.com

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