SRK2000A

SRK2000A Synchronous rectifier smart driver for LLC resonant converters Datasheet - production data Description The SRK2000A 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. SO-8 It provides two high current gate drive outputs, each capable of driving one or more N-channel Power MOSFETs. Each gate driver is controlled Features separately and an interlocking logic circuit Secondary side synchronous rectifier controller prevents the two synchronous rectifier MOSFETs optimized for LLC resonant converters from conducting simultaneously. Protection against current reversal The control scheme in this IC allows for each synchronous rectifier to be switched on as the Safe management of load transient, light load corresponding half-winding starts conducting and and startup condition switched off as its current goes to zero. The Matched turn-off thresholds SRK2000A device implements matched turn-off Intelligent automatic sleep mode at light load MOSFET thresholds. A unique feature of this IC is its intelligent automatic sleep mode. It allows the Dual gate driver for N-channel MOSFETs with detection of a low-power operating condition for 1 A source and 3.5 A sink drive current the converter and puts the IC into a low Operating voltage range 4.5 to 32 V consumption sleep mode where gate driving is Programmable UVLO with hysteresis stopped and quiescent consumption is reduced. In this way, converter efficiency improves at light 250 A quiescent consumption load, where synchronous rectification is no longer Operating frequency up to 500 kHz beneficial. The IC automatically exits sleep mode Available in SO-8 package and restarts switching as it recognizes that the load for the converter has increased. Applications A noticeable feature is the very low external component count required. All-in-one PC High-power AC-DC adapters Table 1. Device summary 80+/85+ compliant ATX SMPS Order code Package Packing 90+/92+ compliant server SMPS SRK2000A Tube Industrial SMPS SO-8 SRK2000ATR Tape and reel May 2017 DocID025407 Rev 3 1/19 This is information on a product in full production. www.st.comContents SRK2000A Contents 1 Internal block diagram . 3 2 Pin description . 4 3 Maximum ratings 6 4 Typical application schematic . 6 5 Electrical characteristics . 7 6 Application information 9 6.1 EN pin - pin function and usage . 9 6.1.1 Pull-up resistor configuration 9 6.1.2 Resistor divider configuration 10 6.1.3 Remote on/off control 11 6.2 Drain voltage sensing 12 6.3 Gate driving . 14 6.4 Intelligent automatic sleep mode . 14 6.5 Protection against current reversal 15 6.6 Layout guidelines . 15 7 Package information 16 7.1 SO-8 package information 17 8 Revision history . 18 2/19 DocID025407 Rev 3