Datasheet > iW671

iW671

更新时间： 2023-12-20 18:44:54

品牌	Logo	应用领域
瑞萨 - RENESAS		/
页数	文件大小	规格书
7页	627K
描述
Digital Synchronous Rectifier Replaces Schottky Diode for Higher Efficiency, Ultra-Compact Offline Power Supplies

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iW671 数据手册

iW671

Digital Green-Mode Synchronous Rectiﬁer Controller

1 Description

The iW671 is a high performance synchronous rectiﬁer controller with an integrated MOSFET driver for ﬂyback

converters operating at discontinuous conduction mode. Combined with the MOSFET, the iW671 can emulate the diode

rectiﬁer at the secondary side of the ﬂyback to reduce conduction loss. The iW671 determines the timing of the driver

by sensing the voltage across the R_DS(ON)to achieve lossless sensing. The iW671 uses proprietary digital adaptive turn-

oﬀ control technology 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 iW671 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.

The iW671 also integrates the adaptive voltage position monitor to detect the ﬂyback converter output voltage

undershoot, enabling faster recovery from standby. Dialog’s iW1766C1 primary-side controllers are optimized to work

with the iW671 for very low output ripple, fast dynamic load response (DLR), and very low no-load power consumption

(< 15mW) at 230V_ACinput in a typical 5V, 2.5A power supply.

2 Features

● Digital adaptive turn-oﬀ control minimizes deadtime

and eliminates the parallel Schottky diode

● Intelligent low power management achieves ultra-low

no-load operating current < 0.65mA

● Integrated pulse linear regulator (PLR) allows SR

operation at low system output voltage down to 2V in

typical 5V, 2.5A USB charger applications

● Lossless MOSFET V_DSsensing for SR timing control

● Integrated adaptive voltage position monitor for fast

ﬂyback output voltage undershoot detection

● Wide input operating voltage up to 30V

● Optimized 5V MOSFET gate driver

● 8-pin SOIC and 8-pin MSOP packages

3 Applications

● Compact AC/DC adapters/chargers for media tablets

and smart phones

OUT

RTN

iW671

VPS

DRV

PLRIN

DRAIN

GND

OUT

Figure 3.1 : iW671 Typical Application Circuit

02-Feb-2022

Rev. 1.3

Product Summary

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