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EFS2ACD Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer EFS2ACD
Beschreibung STARLIGHT-KIT
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 14 Seiten
EFS2ACD Datasheet, Funktion
® EFS
Application Specific Discretes
STARLIGHT-KIT
A.S.D.
2-CHIPS SET FOR FLUORESCENT LAMP STARTER
FEATURES
n VERY WIDE TEMPERATURE RANGE:
tube ignition from - 30 to + 85 °C
n SINGLE SHOT IGNITION FROM -30 to 0°C :
350mA, 1350V striking pulse
n VERY WIDE POWER RANGE:
Fluorescent tube lamp ignition from 18 to 70W
n EFS2B driver compatible with 50/60Hz
operation
n SELECTABLE PREHEAT TIME:
EFS2A driver: 1.5s or 2.56s (50Hz)
EFS2B driver: 0.74s or 1.24s (50Hz)
EFS2B driver: 0.62s or 1.03s (60Hz)
n 8 STRIKING PULSES CAPABILITY:
for very cold environment or ageing lamp
n STARTER SHUTDOWN WITH FAILED LAMP
BENEFITS
n Very low component count: 2 chips + 7 passive
components
n Meet EN55015 standards WITHOUT EMI
capacitor
n Extended life time of the fluorescent lamp due to
smooth and single shot ignition
n High inherent reliability and extended life time
of the starter
S014
EFS2A-CD
EFS2B-CD
PENTAWATT HV
EFS21-TL5
DESCRIPTION
The EFS Kit is a 2 chips set used with 7 additional
passive components, for Glow switch Starter.
The ASD(Application Specific Discretes)
includes a bi-directional Power Switch and a
Power Supply for the driver.
The driver provides a program to ensure a fully
optimised linear fluorescent lamp ignition.
TM : ASD is trademark of STMicroelectronics.
May 2000 - Ed: 5A
1/14






EFS2ACD Datasheet, Funktion
EFS
EFS STARLIGHT-KIT APPLICATION NOTE
1/ THE AC POWER SWITCH: FUNCTIONAL DESCRIPTION
he Starter is a bi-directional switch which performs two functions:
n the preheat of the tube,
n the ignition of the tube.
1
BALLAST
FLUORESCENT
TUBE
220V / 50HZ
PREHEAT
2
V strike
3
The mains voltage is applied
Preheating of the tube
During the preheat period, the ASDis fully
conducting. The tube lamp is short circuited by the
starter, and the current flows through its filaments.
In these conditions, the lamp can not light up, but
the temperature of the lamp electrodes increases.
At the end of the preheat period, lamp filaments
are warm enough to emit electrons in the gas and
to permit the lamp ignition in good conditions. The
ASDswitches off the preheating current . At this
moment, the ballast is equivalent to a current
generator (I=ISO, ISO = Switched Off current). As
the ASDswitches off, the starter voltage
increases. The amplitude of this high voltage spike
is then clamped by the ASD(VBR1350 V). As
the starter and the lamp are in parallel, the striking
pulse is directly applied to the lamp. The
electromagnetic energy of the ballast is then
discharged through the lamp and the ASD.
Striking pulse
2/ WHAT’S NEW IN THIS SWITCH?
The AC SWITCH merges an auxiliary power
supply for the driver, a power clamping device
(1350V) and a bi-directional switch with his
execution pilot block.
NEW EFS ASD
G1 ON / OFF
G2 DRIVER
Striking of the tube
TUBE
Vcc Power supply
GND
6/14

6 Page









EFS2ACD pdf, datenblatt
EFS
8.3. Operation on the 230V/50Hz AC mains in twin tubes configuration
The EFS STARLIGHT-KIT is also suitable for the configurations Twin tubes Starter
Note 5: Components to choose are listed in the table “RECOMMENDED COMPONENTS ACCORDING TO APPLICATION CONDITIONS”
page 5.
The only electrical diagram difference consists of the R4 resistor which needs to be changed from 1 to
2.2k. Without this modification, the starter will generate only one ignition attempt instead of 8 in case of
defective lamp; the loop 3 is removed from the algorithm described in page 9.
AC
MAINS
230V
TWIN TUBE
TT
UU
BB
EE
BALLAST
STARTER
OFF
230V / 50HZ
FLUORESCENT
TUBE
OFF
SOCKET
ALIGHT
Rotate of 180°
only one starter
ALIGHT
In the Twin Series 230V/50Hz configuration, the polarity of the two starters must be respected:
In case of no operation of starters, rotate one of the starters of 180° on its socket.
12/14

12 Page





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