NEX81915
NEX81915 is Fast turn-off dual synchronous rectifiers (SR) controller manufactured by Nexperia.
SO8
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. This allows the SR FET to be turned off quickly when the Vds bees positive.
NEX81915 is a green and energy-saving product. The turn-on delay time will be increased and the drive current will be decreased to minimize the power consumption at light load. The gate drive will be turned off when the load current reduces to a certain level, thus limiting the IC current to a very low level. The light load efficiency can be improved.
The device is available in SO8 (SOT96-2) package.
2. Features and benefits
- 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 m V 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 SO8 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
3. Applications
- AC/DC adapters
- PC power supplies
- LCD TV power supplies
- Isolated DC/DC power...
