L6566B
Multi-mode controller for SMPS
Features
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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
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Hi-end AC-DC adapter/charger
LCD TV/monitor, PDP
digital consumer, IT equipment
single-stage PFC
Figure 1.
V
CC
6.4V
-
+
7.7V
Q
CS
LEB
1.5 V
7
V
CC
OVPL
I
HV
V
CC
5
VOLTAGE
REGULATOR
&
ADAPTIVE UVLO
Reference
voltages
Internal supply
UVLO
LINE VOLTAGE
FEEDFORWARD
V
CC
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
51
STMICROELECTRONICS [ STMICROELECTRONICS ]
