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L6566B Datenblatt(PDF) 1 Page - STMicroelectronics

Teilenummer L6566B
Bauteilbeschribung  Multi-mode controller for SMPS
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6566B Datenblatt(HTML) 1 Page - STMicroelectronics

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May 2008
Rev 2
1/51
51
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
Applications
■ Hi-end AC-DC adapter/charger
■ LCD TV/monitor, PDP
■ digital consumer, IT equipment
■ single-stage PFC
SO16N
www.st.com
Figure 1.
Block diagram
+
-
+
-
ZERO CURRENT
DETECTOR
50 mV
100 mV
VCC
915
7
ZCD
COMP
VFF
CS
GD
4
11
3
LINE VOLTAGE
FEEDFORWARD
1.5 V
+
-
4.5V
DIS
8
LATCH
LEB
14V
Ref erence
voltages
5
VCC
10
Internal supply
VREF
UVLO
VOLTAGE
REGULATOR
&
ADAPTIVE UVLO
FMOD
6
IC_LATCH
DISABLE
UVLO
Q
12
+
-
+
-
0.450V
0.485V
AC_OK
16
13
AC_FAIL
UVLO_SHF
VCC
5.7V
1
HV
SOFT-START
&
FAULT MNGT
14
SS
OSC
MODE/SC
+-
OSCILLATOR
R
S
Q
MODE SELECTION
&
TURN-ON LOGIC
OVERVOLTAGE
PROTECTION
15 µA
7.7V
OCP
PWM
TIME
OUT
TIME
OUT
+
-
Vth
BURST-MODE
LOW CLAMP
& DISABLE
OFF2
OFF2
IHV
Hiccup-mode
OCP logic
3 V
400 uA
DRIVER
OCP2
6.4V
VCC
Icharge
OVPL
OVP
OVPL
OVP


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