L6566B Datasheet, PDF (1/51 Pages) STMicroelectronics – Multi-mode controller for SMPS

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
SO16N
■ 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
Applications
■ Hi-end AC-DC adapter/charger
■ LCD TV/monitor, PDP
■ digital consumer, IT equipment
■ single-stage PFC
■ 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
1
HV
Icharge
VCC
5
10
14
SOFT-START
&
FAULT MNGT
TIME
OUT
VOLTAGE
REGULATOR
&
ADAPTIVE UVLO
Ref erence
voltages
Internal supply
UVLO
VCC
9
15
LOW CLAMP ^OFF2
& DISABLE
VCC
OVP
6.4V
1 mA
OVPL
LINE VOLTAGE
7.7V
Q
FEEDFORWARD
CS
LEB
1.5 V
7
-+ -+ +-
Vth
PWM
OCP
VCC
6
FMOD
UVLO_SHF
-
+
400 uA
5.7V
+
-
BURST-MODE
OSC 13
OSCILLATOR
MODE/SC 12
ZCD
50 mV
100 mV
11
MODE SELECTION
&
TURN-ON LOGIC
ZERO CURRENT
-
DETECTOR
+
OVERVOLTAGE
OVP
PROTECTION
R
Q
S
TIME
OUT OVPL
LATCH
OFF2
IC_LATCH
Hiccup-mode
OCP logic
OCP2
DRIVER
14V
4
GD
4.5V
DIS
8
16
AC_OK
-
3V
15 µA
0.450V
0.485V
+
AC_FAIL
UVLO
DISABLE
3
GND
August 2007
Rev 1
1/51
www.st.com
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