Weltrend | Products

AC/DC switching regulators

WT7131B

The WT7131B is a high-performance synchronous rectification controller. It is used to control a secondary-side synchronous rectification MOSFET in a flyback switch mode power supply. Without external auxiliary winding supplies, the WT7131B can easily provide power to the VDD. It can be powered by VD pin. The WT7131B built-in several circuits to minimize external part counts and overall total system cost. By sensing the voltage across the conduction resistance of MOSFET, the controller can determine the turn-on/turn-off timing of the internal driver to achieve the lowest loss and high speed sensing. Due to the 200V voltage rating of VD pin, the controller is suitable for high output current and wide output voltage range application (e.g., PD3.0 and PPS, from 3.3V to 21V).

Features

- Secondary side controller optimized for USB PD
- VDS MOSFET direct-sensing (200V)
- Suspending for light load operating
- Low startup current
- Low operation current at standby mode
- Suitable for flyback CCM/DCM/QR/Valley switching operation
- No need the auxiliary winding
- Unique dynamic DRV control technology for fast turn off
- Outline Green package : SOT-26

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