December 2003 1/14
VK05CFL
ELECTRONIC DRIVER FOR CFL APPLICATION
■ EMITTER SWITCH POWER OUTPUT STAGE
■ INTEGRATED ANTIPARALLEL COLLECTOR
SOURCE DIODE
■ INTEGRATED DIAC FUNCTION
■ NOMINAL WORKING FREQUENCY
SETTABLE BY EXTERNAL CAPACITOR
■ IGNITION FREQUENCY SET BY LOAD
DESCRIPTION
The VK05CFL is a monolithic device housed in a
standard SO-8 package, made by using
STMicroelectronics proprietary VIPower M3
Technology. This device is intended both for the
low side and the high side driver in half bridge CFL
applications. This means that it is possible to
realize a complete H-bridge by using two
VK05CFL devices: one connected in HSD
configuration and the other connected in LSD
configuration. In the VK05CFL used in HSD
configuration, the diac pin must be connected to
source pin. Both diac functionality and discharge
circuit for external diac capacitor are integrated.
By an external capacitor it is possible to choose
the nominal working frequency without influence
on the ignition one.
TYPE B
V
I
Crms
I
Peak
VK05CFL 520 V 0.25A 1.5A
SO-8
BLOCK DIAGRAM
-
+
osc
2Vref
-
+
Diac
sec
diac
Source
Collector
5Vref
R
Obsolete Product(s) - Obsolete Product(s)