SRK2000:SYNCHRONOUS 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.

Key Features

  • 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
Product Specifications
DescriptionVersionSize
DS6922: Synchronous rectifier smart driver for LLC resonant converters3.0390 KB
Application Notes
DescriptionVersionSize
AN3233: 12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6599A, and SRK20001.02 MB
AN3014: 19 V, 90 W resonant converter with synchronous rectification using the L6563H, L6599A and SRK20002.11004 KB
AN3303: Secondary-side rectification for an LLC resonant converter featuring the SRK20002.02 MB
Presentations
DescriptionVersionSize
Secondary regulation Synchronous rectification controllers2 MB
Brochures
DescriptionVersionSize
Brochure Power management guide05.20164 MB
Sample & Buy
Part NumberPackagePacking TypeUnit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
SRK2000DTRSO-8Tape And Reel0.931000NECEAR99MOROCCO
SRK2000DSO-8Tube0.931000NECEAR99MOROCCO
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
SRK2000DTRSO-8IndustrialEcopack2md_o7-wspc-so08.15jedec_aho7-wspc-uq27ad5-wspc-lock.pdf
md_o7-wspc-so08.xml
SRK2000DSO-8IndustrialEcopack2md_o7-wspc-so08.15jedec_aho7-wspc-uq27ad5-wspc-lock.pdf
md_o7-wspc-so08.xml
Synchronous rectifier smart driver for LLC resonant converters SRK2000
circuit_diagram_17811_thumbnail.png SRK2000
12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6599A, and SRK2000 L6599A
19 V, 90 W resonant converter with synchronous rectification using the L6563H, L6599A and SRK2000 L6599A
Secondary-side rectification for an LLC resonant converter featuring the SRK2000 SRK2000
Secondary-side rectification for an LLC resonant converter featuring the SRK2000 SRK2000
Very low drop voltage regulators with inhibit KFXX
md_o7-wspc-so08.15jedec_aho7-wspc-uq27ad5-wspc-lock.pdf SRK2000
md_o7-wspc-so08.xml VN751S