General description

The TEA2095TE is a new synchronous rectifier (SR) controller IC for switched-mode

power supplies. It incorporates an adaptive gate drive method for maximum efficiency at

any load.

The TEA2095TE is a dedicated controller IC for synchronous rectification on the

secondary side of resonant converters. It has two driver stages for driving the SR

MOSFETs, which rectify the outputs of the central tap secondary transformer windings.

The two gate driver stages have their own sensing inputs and operate independently.

The TEA2095TE is optimized for efficient operation with very low-ohmic MOSFETs and

switching at high frequencies.

The TEA2095TE is fabricated in a silicon-on-insulator (SOI) process.

Features and benefits

2.1 Efficiency features

? Adaptive gate drive for maximum efficiency at any load

? Supply current in energy save operation of 90 μA

? Regulation level of ?25 mV for driving low-ohmic MOSFETs

2.2 Application features

? Wide supply voltage range from 4.5 V to 38 V

? Dual synchronous rectification for LLC resonant

? Supports 5 V operation with logic level SR MOSFETs

? Differential inputs for sensing the drain and source voltages of each SR MOSFET

? HSO8 package with exposed die pad

? Discharge of the output capacitor after mains disconnect

2.3 Control features

? SR control without minimum on-time

? Adaptive gate drive for fast turn-off at the end of conduction

? Undervoltage lockout (UVLO) protection with active gate pull-down

? Interlock function to prevent simultaneous conduction of the external MOSFETs

? Supports 1 MHz switching frequency

Applications

The TEA2095TE is intended for resonant power supplies. In such applications, it can

drive two external synchronous rectifier MOSFETs for the rectification of the voltages on

the two secondary windings of the transformer. These MOSFETs replace diodes. It can

be used in all power supplies requiring high efficiency:

? Adapters

? Power supplies for desktop PC and all-in-one PC

? Power supplies for television

? Power supplies for servers