L6566A_08 Datasheet, PDF (1/51 Pages) STMicroelectronics – Multi-mode controller for SMPS with PFC front-end

L6566A
Multi-mode controller for SMPS with PFC front-end
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
■ Switched supply rail for PFC controller
■ Latched or autorestart OVP
■ Brownout protection
■ -600/+800 mA totem pole gate driver with
active pull-down during UVLO
■ SO16N package
SO16N
Applications
■ Notebook, TV and LCD monitors adapters
■ High power chargers
■ PDP/LCD TV
■ Consumer appliances, like DVD, VCR, set-top
box
■ IT equipment, games, aux. power supplies
■ Power supplies in excess of 150 W
Figure 1.
May 2008
Block diagram
VREF
SS
COMP
VFF
1
HV
IHV
VCC
5
10
14
SOFT-START
&
FAULT MNGT
TIME
OUT
VOLTAGE
REGULATOR
&
ADAPTIVE UVLO
OCP2
Ref erence
voltages
Internal supply
UVLO
VCC
9
15
LOW CLAMP ^OFF2
& DISABLE
VCC
OVP
6.4V
Icharge
OVPL
LINE VOLTAGE
7.7V
Q
FEEDFORWARD
CS
LEB
1.5 V
7
-+ -+ +-
Vth
PWM
OCP
VCC
6
Vcc_PFC
IC_LATCH
AC_FAIL
-
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
Rev 2
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