TFA3351 Datasheet, PDF (3/12 Pages) List of Unclassifed Manufacturers – IC for Electronic Ballasts

Pinning
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
TM
CT
TR
GND
EI
LW
S
V_CC
temperature mode selection
clock generator
trigger output, turn-off attenuation, oscillation detector
connection to ground
error indication input
input of lamp change
switching output of the timer
supply voltage
Block Diagram
V
CC
8
POWER SUPPLY
UNIT
S
7
TIMER OUTPUT
REFERENCE
VOLTAGE
STARTING
CONTROL
LW
6
RESET ERROR
STORAGE +
RELEASE TRIGGER
STOP
COUNTER
SHORTENING
FOR TEST
EI
5
ERROR
DETECTION
+ LOGIC
TURN - OFF
DELAY
OVER-
TEMPERATURE
SENSOR
TEMPERATURE
MODE
SELECTION
1
TM
CLOCK
GENERATOR
CLOCK REGIME
2
CT
TRIGGER
OUTPUT
ATTENUATION
OF OSCILLATIONS
OSCILLATION
DETECTOR
LOGIC FOR
TRIGGER- AND
TURN-OFF REGIME
TURN - OFF
MEMORY
TFA 3351
3
4
TR
Characteristics of the IC TFA3351
• The TFA3351 is a control- and monitoring-IC to drive an electronic ballast for fluorescent lamps.
• The IC actuates the oscillation of a self-oscillating circuit for generation of RF-shaped lamp current by means of
trigger pulses. After successful excitation the oscillation is monitored and further trigger pulses are blocked.
• The IC has a timer with low-active output which is activated for one second after supply voltage was applied.
The switching output is effective for pre-heating and ignition systems.
• The IC consists an error indication input. In case of error indication the IC stops oscillation. Enquiry cycles
realize interference reduction.
• After lamp change the IC starts oscillation again.
• The IC protects from overtemperature cutting oscillation. It is programmable when the oscillator circuit shall be
triggered again.
2
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TFA3351