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L6565 Arkusz danych(PDF) 1 Page - STMicroelectronics

Numer części L6565
Szczegółowy opis  QUASI-RESONANT SMPS CONTROLLER
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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L6565
January 2003
s
QUASI-RESONANT (QR) ZERO-VOLTAGE-
SWITCHING (ZVS) TOPOLOGY
s
LINE FEED FORWARD TO DELIVER
CONSTANT POWER vs. MAINS CHANGE
s
FREQUENCY FOLDBACK FOR OPTIMUM
STANDBY EFFICIENCY
s
PULSE-BY-PULSE & HICCUP-MODE OCP
s
ULTRA-LOW START-UP (< 70µA) AND
QUIESCENT CURRENT (< 3.5mA)
s
DISABLE FUNCTION (ON/OFF CONTROL)
s
1% PRECISION (@ Tj = 25°C) INTERNAL
REFERENCE VOLTAGE
s
±400mA TOTEM POLE GATE DRIVER WITH
UVLO PULL-DOWN
s
BLUE ANGEL, ENERGY STAR, ENERGY
2000 COMPLIANT
APPLICATIONS
s
TV/MONITOR SMPS
s
AC-DC ADAPTERS/CHARGERS
s
DIGITAL CONSUMER
s
PRINTERS, FAX MACHINES,
PHOTOCOPIERS AND SCANNERS
DESCRIPTION
The L6565 is a current-mode primary controller IC,
specifically designed to build offline Quasi-resonant
ZVS (Zero Voltage Switching at switch turn-on) fly-
back converters.
Quasi-resonant operation is achieved by means of a
transformer demagnetization sensing input that trig-
gers MOSFET's turn-on.
DIP8(Minidip)
SO-8
ORDERING NUMBERS:
L6565N
L6565D
QUASI-RESONANT SMPS CONTROLLER
BLOCK DIAGRAM
+
-
VREF2
VOLTAGE
REGULATOR
INTERNAL
SUPPLY
+
-
2.5V
R1
R2
+
-
DRIVER
+
-
ZERO CURRENT
DETECTOR
2.1V
1.6V
VCC
8
1
23
4
ZCD
VCC
INV
COMP
VFF
CS
GD
7
5
GND
6
20V
40K
5pF
BLANKING
LINE VOLTAGE
FEEDFORWARD
Hiccup-mode
OCP
DISABLE
R
S
Q
STARTER
2 V
+
-
Hiccup-mode
OCP
Starter
STOP
Q
UVLO
Blanking
START


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