L6566BTR STMicroelectronics

+ 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) SO16N Adaptive UVLO Line feedforward for constant power capability vs mains voltage Applications Pulse-by-pulse OCP, shutdown on overload (latched or autorestart) Hi-end AC-DC adapter/charger Transformer saturation detection LCD TV/monitor, PDP Programmable frequency modulation for EMI digital consumer, IT equipment reduction single-stage PFC Latched or autorestart OVP Brownout protection -600/+800 mA totem pole gate driver with active pull-down during UVLO SO16N package Figure 1. Block diagram VREF SS COMP VFF 10 14 9 CC V 15 6.4V LOW CLAMP TIME OVPL OVP 1 &DISABLE SOFT-START OUT 1mA HV & OFF2 FAULT MNGT 7.7V LINE VOLTAGE Q charge FEEDFORWARD I Reference VOLTAGE CS voltages REGULATOR Internal supply LEB VCC & 5 7 ADAPTIVE UVLO UVLO 1.5 V - + - + +- Vth CC PWM OCP V VCC UVLO SHF 400 uA + 6 FMOD Hiccup-mode - - 14V OCP logic 5.7V BURST-MODE + OCP2 4 GD OSC 13 OSCILLATOR R Q DRIVER S MODE SELECTION & MODE/SC 12 TURN-ON LOGIC TIME ZERO CURRENT 50 mV OUT OVPL - DETECTOR 100 mV ZCD + 4.5V 11 OFF2 OVP OVERVOLTAGE LATCH PROTECTION DIS 8 IC LATCH 16 - AC OK AC FAIL DISABLE 15 A 0.450V 3V + UVLO 0.485V 3 GND December 2008 Rev 3 1/51 www.st.com 51 + - -Contents L6566B Contents 1 Description . 6 2 Pin settings 8 2.1 Connections 8 2.2 Pin description 8 3 Electrical data . 11 3.1 Maximum rating 11 3.2 Thermal data 11 4 Electrical characteristics 12 5 Application information . 17 5.1 High-voltage start-up generator 18 5.2 Zero current detection and triggering block oscillator block 21 5.3 Burst-mode operation at no load or very light load 24 5.4 Adaptive UVLO . 25 5.5 PWM control block 26 5.6 PWM comparator, PWM latch and voltage feedforward blocks 27 5.7 Hiccup-mode OCP 30 5.8 Frequency modulation . 31 5.9 Latched disable function 32 5.10 Soft-start and delayed latched shutdown upon overcurrent . 33 5.11 OVP block . 35 5.12 Brownout protection . 37 5.13 Slope compensation . 40 5.14 Summary of L6566B power management functions 41 2/51