SRK2000SYNCHRONOUS RECTIFIER SMART DRIVER FOR LLC RESONANT CONVERTER
The SRK2000 smart driver implements a control scheme specific to secondary-side synchronous rectification in LLC resonant converters that use a transformer with center-tap secondary winding for full-wave rectification.
It provides two high current gate drive outputs, each capable of driving one or more N-channel Power MOSFETs. Each gate driver is controlled separately and an interlocking logic circuit prevents the two synchronous rectifier MOSFETs from conducting simultaneously.
The control scheme in this IC allows for each synchronous rectifier to be switched on as the corresponding half-winding starts conducting and switched off as its current goes to zero. A unique feature of this IC is its intelligent automatic sleep mode. It allows the detection of a low-power operating condition for the converter and puts the IC into a low consumption sleep mode where gate driving is stopped and quiescent consumption is reduced. In this way, converter efficiency improves at light load, where synchronous rectification is no longer beneficial. The IC automatically exits sleep mode and restarts switching as it recognizes that the load for the converter has increased.
A noticeable feature is the very low external component count required.
- Secondary-side synchronous rectifier controller optimized for LLC resonant converters
- Protection against current reversal
- Safe management of load transient, light load and startup condition
- Intelligent automatic sleep mode at light load
- Dual gate driver for N-channel MOSFETs with 1 A source and 3.5 A sink drive current
- Operating voltage range 4.5 to 32 V
- Programmable UVLO with hysteresis
- 250 μA quiescent consumption
- Operating frequency up to 500 kHz
- Available in SO-8 package
DS6922: Synchronous rectifier smart driver for LLC resonant converters
AN3014: 19 V, 90 W resonant converter with synchronous rectification using the L6563H, L6599A and SRK2000
AN3233: 12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6599A, and SRK2000
AN3303: Secondary-side rectification for an LLC resonant converter featuring the SRK2000
Presentations & Training Material
Secondary regulationSynchronous rectification controllers
Sample & BuyTop
|Part Number||Marketing Status||Package||Packing Type||Automotive Grade||Order From ST||Unit Price (US$)*|
|Distributor Availability||RoHS Compliance Grade||Download
|SRK2000DTR||Active||SO-8||Tape And Reel||_||.881|
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