L6566A STMicroelectronics

+ L6566A Multi-mode controller for SMPS with PFC front-end Datasheet production data Features Selectable multi-mode operation: fixed frequency or quasi-resonant Onboard 700 V high-voltage startup Advanced light load management Low quiescent current (< 3 mA) SO16N Adaptive UVLO Line feedforward for constant power capability Applications vs. mains voltage Pulse-by-pulse OCP, shutdown on overload Notebook, TV and LCD monitor adapters (latched or auto-restart) High power chargers Transformer saturation detection PDP/LCD TVs Switched supply rail for PFC controller Consumer appliances, such as DVD players, Latched or auto-restart OVP VCRs, set-top boxes Brownout protection IT equipment, games, auxiliary power supplies -600/+800 mA totem pole gate-driver with Power supplies in excess of 150 W active pull-down during UVLO SO16N package Figure 1. Block diagram VREF SS COMP VFF 10 14 9 VCC 15 6.4V LOW CLAMP TIME OVPL OVP 1 &DISABLE SOFT-START OUT 1mA HV & OFF2 FAULT MNGT 7.7V LINE VOLTAGE Q FEEDFORWARD Icharge Reference VOLTAGE CS voltages REGULATOR Internal supply LEB VCC & 5 7 ADAPTIVE UVLO UVLO 1.5 V - + - + +- Vth PWM OCP VCC VCC OCP2 400 uA IC LATCH + 6 Vcc PFC AC FAIL Hiccup-mode - - UVLO SHF 14V OCP logic 5.7V BURST-MODE + OCP2 4 GD OSC 13 OSCILLATOR R Q DRIVER MODE SELECTION S & MODE/SC 12 TURN-ON LOGIC TIME ZERO CURRENT 50 mV OUT OVPL - DETECTOR 100 mV ZCD + 4.5V OFF2 11 OVP OVERVOLTAGE LATCH PROTECTION DIS 8 IC LATCH 16 - AC OK AC FAIL DISABLE 15 A 0.450V 3V + UVLO 0.485V 3 GND March 2012 Doc ID 13794 Rev 4 1/52 This is information on a product in full production. www.st.com 52 + - -Contents L6566A Contents 1 Description . 5 2 Pin settings 7 2.1 Connections 7 2.2 Pin description 7 3 Electrical data . 10 3.1 Maximum rating 10 3.2 Thermal data 10 4 Electrical characteristics 11 5 Application information . 15 5.1 High-voltage startup generator . 16 5.2 Zero current detection and triggering block oscillator block 19 5.3 Burst-mode operation at no load or very light load 22 5.4 Adaptive UVLO . 23 5.5 PWM control block 24 5.6 PWM comparator, PWM latch and voltage feedforward blocks 25 5.7 Hiccup-mode OCP 28 5.8 PFC interface 29 5.9 Latched disable function 30 5.10 Soft-start and delayed latched shutdown upon overcurrent . 31 5.11 OVP block . 33 5.12 Brownout protection . 35 5.13 Slope compensation . 38 5.14 Summary of L6566A power management functions 38 6 Application examples and ideas 43 7 Package mechanical data 46 2/52 Doc ID 13794 Rev 4