L6566B

L6566B Multi-mode controller for SMPS Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Selectable multi-mode operation: fixed frequency or quasi-resonant On-board 700 V high-voltage start-up Advanced light load management Low quiescent current (< 3 mA) Adaptive UVLO Line feedforward for constant power capability vs mains voltage Pulse-by-pulse OCP, shutdown on overload (latched or autorestart) Transformer saturation detection Programmable frequency modulation for EMI reduction Latched or autorestart OVP Brownout protection -600/+800 mA totem pole gate driver with active pull-down during UVLO SO16N package Block diagram VREF 10 1 HV SS 14 SOFT-START & FAULT MNGT TIME OUT COMP 9 VFF 15 LOW CLAMP OFF2 & DISABLE OVP Icharge SO16N Applications ■ ■ ■ ■ Hi-end AC-DC adapter/charger LCD TV/monitor, PDP digital consumer, IT equipment single-stage PFC Figure 1. www.DataSheet4U.com VCC 6.4V + 7.7V Q CS LEB 1.5 V 7 VCC OVPL I HV VCC 5 VOLTAGE REGULATOR & ADAPTIVE UVLO Reference voltages Internal supply UVLO LINE VOLTAGE FEEDFORWARD VCC UVLO_SHF Vth + - + PWM + OCP + - 6 FMOD + OSC 13 400 uA Hiccup-mode OCP logic OCP2 14V 4 GD 5.7V BURST-MODE OSCILLATOR MODE SELECTION & TURN-ON LOGIC + OVERVOLTAGE PROTECTION OVP LATCH IC_LATCH ZERO CURRENT DETECTOR R Q S DRIVER MODE/SC 12 50 mV 100 mV TIME OUT OVPL 4.5V + DIS 8 3 OFF2 ZCD 11 16 AC_OK 3V 15 µA 0.450V 0.485V + AC_FAIL UVLO DISABLE May 2008 Rev 2 1/51 www.st.com 51 Contents L6566B Contents 1 2 Description . . . . ....