双极性晶体管

二极管

ESD保护、TVS、滤波和信号调节ESD保护

MOSFET

氮化镓场效应晶体管(GaN FET)

绝缘栅双极晶体管(IGBTs)

模拟和逻辑IC

汽车应用认证产品(AEC-Q100/Q101)
SOT8061-1

NEX81801DA; NEX81802DA

Adaptive Synchronous Rectifier (SR) Controller

The NEX81801DA and NEX81802DA (NEX81801/2DA) are high performance synchronous rectification controllers used in switching mode power supplies. It supports operation in Discontinuous Conduction Mode (DCM), Continuous Conduction Mode (CCM) and quasi-resonant flyback converters.

The NEX81801/2DA regulates the forward drop voltage of an external synchronous rectifier (SR) MOSFET in two stages. This allows the SR FET to turn off quickly when the VDS becomes positive.

The externally adjustable turn-on blanking time can effectively prevent the synchronous rectifier from being falsely turned off due to leakage inductance and parasitic parameter oscillation.

The adaptive turn-on detection circuit can prevent the SR from being mistakenly turned on when the VDS DCM oscillation crosses zero during some load conditions. The adaptive turn-on detection circuit also enhances SR conduction efficiency during light load conditions, thereby improving the average efficiency of the power supply across the entire load range.

The synchronous switch can be configured at high-side or low-side output without auxiliary windings or other power sources, because the NEX81801/2DA has a self-supply capability.

The NEX81801/2DA uses TSOT23-6 packaging with low thermal resistance. This can effectively reduce the junction temperature of the chip, making it suitable for high-density power supply design.

Features and benefits

  • Supports DCM, CCM, QR operation

  • Supports up to 800 kHz switching frequency

  • Standard and logic level MOSFET driving capability

  • Wide output range down to 0 V with 2-channel VCC supply

  • No need for auxiliary winding for high-side or low-side rectification

  • Smart proportional gate driver for fast SR turn-off at CCM

  • Adjustable turn-on blanking time for increased noise immunity

  • Proprietary adaptive turn-on detection prevents SR FET from falsely turning on during DCM operation

  • 10 ns typical turn-off propagation delay

  • Available in a TSOT23-6 FC package

  • ESD protection:

    • HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V

    • CDM: ANSI/ESDA/JEDEC JS-002 class C2a exceeds 500 V

Applications

  • USB PD/QC chargers

  • AC/DC adapters for portable devices

  • Flyback SMPS with high-efficiency requirements

封装

型号 可订购的器件编号，（订购码(12NC)） 状态 标示 封装 外形图 回流焊/波峰焊 包装
NEX81801DA NEX81801DAZ
(935692117342)		 Active ND3 SOT8061-1
TSOT23-6
(SOT8061-1) 		SOT8061-1 REFLOW_BG-BD-1
SOT8061-1_342
NEX81802DA NEX81802DAZ
(935691936342)		 Active ND4 SOT8061-1
TSOT23-6
(SOT8061-1) 		SOT8061-1 REFLOW_BG-BD-1
SOT8061-1_342

环境信息

型号 可订购的器件编号 化学成分 RoHS RHF指示符
NEX81801DA NEX81801DAZ NEX81801DA rohs rhf rhf
NEX81802DA NEX81802DAZ NEX81802DA rohs rhf rhf
品质及可靠性免责声明

文档 (4)

文件名称 标题 类型 日期
NEX8180X Adaptive Synchronous Rectifier (SR) Controller Data sheet 2025-04-16
AN90063 Questions about package outline drawings Application note 2025-06-13
SOT8061-1 plastic, surface-mounted package; 6 leads; 0.95 mm pitch; 2.9 mm x 1.6 mm x 1.1 mm body Package information 2024-04-09
REFLOW_BG-BD-1 Reflow soldering profile Reflow soldering 2021-04-06

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