This is information on a product in full production.
March 2012 Doc ID 13794 Rev 4 1/52
52
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)
Adaptive UVLO
Line feedforward for constant power capability
vs. mains voltage
Pulse-by-pulse OCP, shutdown on overload
(latched or auto-restart)
Transformer saturation detection
Switched supply rail for PFC controller
Latched or auto-restart OVP
Brownout protection
-600/+800 mA totem pole gate-driver with
active pull-down during UVLO
SO16N package
Applications
Notebook, TV and LCD monitor adapters
High power chargers
PDP/LCD TVs
Consumer appliances, such as DVD players,
VCRs, set-top boxes
IT equipment, games, auxiliary power supplies
Power supplies in excess of 150 W
Figure 1. Block diagram
SO16N
+-
+
-
ZERO CURRENT
DETECTOR
50 mV
100 mV
V
CC
9
15
7
ZCD
COMP
VFF
CS
GD
4
11
GND
3
LINE VOLTAGE
FEEDFORWARD
1.5 V
+-
+
-
4.5V
DIS
8
LATCH
LEB
14V
Reference
voltages
5
V
CC
10
Internal supply
VREF
UVLO
VOLTAGE
REGULATOR
&
ADAPTIVE UVLO
Vcc_PFC
6
IC_LATCH
DISAB LE
UVLO
IC_LATCH
Q
12
+
-
AC_FAIL
13
AC_FAIL
UVLO_SHF
V
CC
5.7V
1
HV
SOFT-START
&
FAULT MNGT
14
SS
OSC
MODE/SC
+-
OSCILLATOR
R
S
Q
MODE SELECTION
&
TURN-ON LOGIC
OVERVOLTAGE
PROTECTION
7.7V
OCPPWM
TIME
OUT
TIME
OUT
+
-
Vth
BURST-MODE
LOW CLAMP
&DISABLE
OFF2
OFF2
I
charge
Hiccup-mode
OCP logic
400 uA
DRIVER
OCP2
+
-
6.4V
V
CC
1mA
OVPL
OVP
OVPL
OVP
OCP2
+
-
0.450V
0.485V
AC_OK
16
15 µA
3V
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Contents L6566A
2/52 Doc ID 13794 Rev 4
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
L6566A Contents
Doc ID 13794 Rev 4 3/52
8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

L6566A

Mfr. #:
Manufacturer:
STMicroelectronics
Description:
Power Factor Correction - PFC Multi Mode PWM Controller
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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