L6591

L6591 PWM controller for ZVS half-bridge Features ■ Complementary PWM control for soft-switched www.DataSheet4U.com half-bridge with programmable dead-time ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Up to 500 kHz operating frequency On-board high-voltage start-up Advanced light load management Adaptive UVLO Pulse-by-pulse OCP OLP (latched or autorestart) Transformer saturation detection Interface with PFC controller Latched disable input Input for power-on sequencing or brownout protection Programmable soft-start ■ ■ SO16 narrow SO-16 600 V-rail compatible high-side gate driver with integrated bootstrap diode and high dV/dt immunity SO16N package Applications ■ ■ ■ High power AC-DC adapter/charger Desktop PC, entry-level server Telecom SMPS 4 % precision external reference Figure 1. Typical application circuit H V 16 5 OSC TIMING HV ge nerator ON/O FF a nd a daptive UV LOmanag e ment Vcc_OK R + S 4.5V 1.5V ISEN 3 + R + PWM R PFC _STOP 8 S OCP2 DI S 1.5V 1 LINE 1 5µA + SOFT-STAR T 4 SS R 2.0 V 7 COMP L I NE_OK BUR ST- M OD E C TR L Ilimre f 0 .8 V max. + OCP 3R + + 1.7 5V 0. 3 2mA Q OCP2 L I NE_ OK VREG Vc c _O K DIS S HUT DO WN Q DIS Low UVLO Sync hronou s bo ot stra p diode 15 BOOT HIC CUP BLANKI NG S Q P WM _CT L Dead time adjustment & logic L EVEL SHIFTER 14 HVG 13 FGND V CC CLK 25 V Vre f VREG 6 VREF 9 V CC 2 DIS 10 L VG L ow U V LO 11 GND June 2008 Rev 1 1/32 www.st.com 32 Contents L6591 Contents 1 2 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....