®
L6561
POWER FACTOR CORRECTOR
VERY PRECISE ADJUSTABLE OUTPUT
OVERVOLTAGE PROTECTION
MICROPOWERSTART-UPCURRENT (50µATYP.)
VERY LOW OPERATING SUPPLY CURRENT
(4mA TYP.)
INTERNAL START-UP TIMER
CURRENT SENSE FILTER ON CHIP
DISABLE FUNCTION
1% PRECISION (@ T
j
= 25°C) INTERNAL
REFERENCE VOLTAGE
TRANSITION MODE OPERATION
TOTEM POLE OUTPUT CURRENT:
±400mA
DIP8/SO8 PACKAGES
DESCRIPTION
L6561 is the improved version of the L6560
standard Power Factor Corrector. Fully compat-
ible with the standard version, it has a superior
performant multiplier making the device capable
of working in wide input voltage range applica-
tions (from 85V to 265V) with an excellent THD.
Furthermore the start up current has been re-
duced at few tens of
µA
and a disable function
has been implemented on the ZCD pin, guaran-
teeing lower current consumption in stand by
mode.
BLOCK DIAGRAM
COMP
2
INV
1
2.5V
-
+
Minidip
SO8
ORDERING NUMBERS:
L6561
(Minidip)
L6561D
(SO8)
Realised in mixed BCD technology, the chip gives
the following benefits:
- micro power start up current
- 1% precision internal reference voltage
(Tj = 25°C)
- Soft Output Over Voltage Protection
- no need for external low pass filter onthe current
sense
- verylow operating quiescent current minimises
power dissipation
The totem pole output stage is capable of driving
a Power MOS or IGBT with source and sink cur-
rents of +/- 400mA. The device is operating in
transition mode and it is optimised for Electronic
Lamp Ballast application, AC-DC adaptors and
SMPS.
MULT
3
4
40K
CS
MULTIPLIER
VOLTAGE
REGULATOR
OVER-VOLTAGE
DETECTION
+
-
5pF
V
CC
8
V
CC
INTERNAL
SUPPLY 7V
R1
+
R2
-
V
REF2
2.3V
1.8V
-
+
ZERO CURRENT
DETECTOR
STARTER
UVLO
R
S
DRIVER
Q
7
20V
GD
DISABLE
6
GND
5
ZCD
D97IN547B
April 1999
1/11
STMICROELECTRONICS [ STMICROELECTRONICS ]
