STMicroelectronics SRK1004 Synchronous Rectifier Controllers

STMicroelectronics SRK1004 Synchronous Rectifier Controllers are intended for secondary side synchronous rectification (SR) in Non-Complementary Actively Clamped Flyback, Resonant Flyback, and QuasiResonant Flyback converters. It provides a gate-drive output suitable for N-channel logic-level or standard-level power MOSFETs. The control scheme of this device is such that the SR MOSFET is switched on as soon as current starts flowing through its body diode and then switched off as the current approaches zero. When operated in a low-side configuration, the device can be supplied directly from the converter’s output voltage. Powering the STMicroelectronics SRK1004 from a dedicated auxiliary winding is recommended when used in the high-side configuration. When operated in a high-side configuration, a special function enables quick detection of short-circuit conditions to inhibit its operation as if the IC were powered directly from the output voltage.

Features

Secondary-side synchronous rectification controller optimized for Non-Complementary Actively Clamped Flyback converter (NC-ACF)
Able to operate in both low-side and high-side configuration
Supporting logic level (A and B) and standard level (C and D) MOSFETs
Two different turn-off delays are available to cover a wide range of MOSFETs

4V to 36V wide range supply voltage
Very low operating current (580µA) and quiescent current (230µA)
High-voltage sensing input for SR MOSFET drain-source voltage (190V AMR)
Operating frequency up to 500kHz
Fast short-circuit detector
Tiny DFN 6L 2mm x 2mm package

Applications

High-power-density USB-PD adapters/chargers
USB-PD wall-plugs
In-wall smart outlets

STMicroelectronics SRK1004 Synchronous Rectifier Controllers

Features

Applications

Internal Block Diagram

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