L6566B
Multi-mode controller for SMPS
Features
■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■
Selectable multi-mode operation: fixed frequen...
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.
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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
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Contents
L6566B
Contents
1 2 Description . . . . ....