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NEX81915 - Fast turn-off dual synchronous rectifiers (SR) controller

Description

NEX81915 is a dedicated controller IC for synchronous rectification on the secondary side of resonant converters.

It supports operation in discontinuous conduction mode (DCM), continuous conduction mode (CCM) and critical conduction mode (CRM).

It has two driver stages for driving the SR MOSFETs.

Features

  • 120 V voltage rating support maximum 48 V output.
  • Supports CCM, CRM and DCM operation.
  • Works with Standard and Logic level MOSFETs.
  • Wide supply voltage ranges from 4.8 V to 35.0 V.
  • 140 μA low quiescent current in light load mode.
  • Regulation level of.
  • 37 mV for driving low-ohmic MOSFETs.
  • Adaptive gate drive for fast turn-off at the end of conduction.
  • Interlock function for channel A and B.
  • Available in an SO.

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Datasheet Details

Part number NEX81915
Manufacturer nexperia
File Size 251.08 KB
Description Fast turn-off dual synchronous rectifiers (SR) controller
Datasheet download datasheet NEX81915 Datasheet
Additional preview pages of the NEX81915 datasheet.

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Full PDF Text Transcription

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SO8 NEX81915 Fast turn-off dual synchronous rectifiers (SR) controller Rev. 1 — 11 July 2025 Product data sheet 1. General description NEX81915 is a dedicated controller IC for synchronous rectification on the secondary side of resonant converters. It supports operation in discontinuous conduction mode (DCM), continuous conduction mode (CCM) and critical conduction mode (CRM). It has two driver stages for driving the SR MOSFETs. By detecting the Vds of the rectifier, the MOSFETs can be reliably switched on and off, thereby replacing Schottky diodes and improving the efficiency of the resonant converter. NEX81915 regulates the forward drop voltage of an external synchronous rectifier (SR) MOSFET by decreasing the gate voltage.
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