EVLSRK2000-S-40

SRK2000 Synchronous rectifier smart driver for LLC resonant converters Datasheet - production data Description 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. 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 prevents the two synchronous rectifier MOSFETs Secondary-side synchronous rectifier from conducting simultaneously. controller optimized for LLC resonant converters The control scheme in this IC allows for each synchronous rectifier to be switched on as the Protection against current reversal corresponding half-winding starts conducting and Safe management of load transient, light load switched off as its current goes to zero. A unique and startup condition feature of this IC is its intelligent automatic sleep Intelligent automatic sleep mode at light load mode. It allows the detection of a low-power operating condition for the converter and puts the Dual gate driver for N-channel MOSFETs with IC into a low consumption sleep mode where gate 1 A source and 3.5 A sink drive current driving is stopped and quiescent consumption is Operating voltage range 4.5 to 32 V reduced. In this way, converter efficiency Programmable UVLO with hysteresis improves at light load, where synchronous rectification is no longer beneficial. The IC 250 A quiescent consumption automatically exits sleep mode and restarts Operating frequency up to 500 kHz switching as it recognizes that the load for the Available in SO-8 package converter has increased. A noticeable feature is the very low external Applications component count required. All-in-one PC Table 1. Device summary High-power AC-DC adapters Order code Package Packing 80+/85+ compliant ATX SMPS SRK2000D Tube 90+/92+ compliant server SMPS SO-8 SRK2000DTR Tape and reel Industrial SMPS May 2017 DocID17811 Rev 4 1/19 This is information on a product in full production. www.st.comContents SRK2000 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 DocID17811 Rev 4