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KODENSHI KOREA

KKA3354 Datasheet Preview

KKA3354 Datasheet

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TECHNICAL DATA
IC for Electronic Ballasts
KKA3354
Short Description
The bipolar monolithic integrated circuit triggers,
monitors and turns-off RF-oscillation of an electronic
ballast for fluorescent lamps dependent on several control-
and monitoring functions.
Features
Minimum wiring complexity
Overtemperature protection without external
components
Malfunction detection
Timer output
Automatical reignition after lamp change
Pinning
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
TM
CT
TR
GND
EI
LW
S
VCC
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
Characteristics of the IC
• The KKA3354 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.
1




KODENSHI KOREA

KKA3354 Datasheet Preview

KKA3354 Datasheet

IC

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KKA3354
Functional Description
At the moment of current feeding at terminal VCC, the IC generates the supply voltage via backup capacitor
externally connected. As soon as an internal switching threshold of 7 V is reached, trigger pulses are
delivered at the output TR with a repetition instalment of 960 µs. After successful triggering of the oscillator
circuit, an oscillation detector guarantees blocking of further trigger pulses. It identifies a stable oscillating
process, after a minimum of oscillations is detected per timing.
As soon as a switching threshold of 8 V is reached, all logic units are reset and the timer output S is activated
as well. The IC starts a counter, which interrups the control after one second.
Furthermore, the IC monitors the temperature and the oscillation circuit from a supply voltage of 8 V.
The comparator input EI is useful for error detection. Voltage > 3.75 V, applied at EI, are evaluated as error
signals. The error signal is enqired and registered within a cycle repeating every 960 µs. After registration of
the error signal, a counter starts to generate a delay of one second. After this delay time, the voltage at EI is
evaluated again. The error storage is set only after a second error, appearing within a directly following
evaluation cycle. This error storage is resettable by a short-time power supply disconnection, or with input
LW connected via a change of lamp.
The error storing causes the cutting further triggers and the control of the turn-off transistor as well, which
turns the output TR to ground. Therefore, the turn-off transistor prevents the control of the oscillator circuit,
attenuating it extremly quickly.
Thereby, the current consumption increases by the control of the turn-off transistor. This current amounts
more than 5 mA, that the supply voltage across the backup capacitor at pin VCC breaks down (because
nominal current
feed is less 5 mA). With a switching threshold of 6 V, the control current of the turn-off transistor is
switched off, that enables the supply voltage to rise up to the limiting voltage. Because the trigger pulse gate,
blocked by the error memory, the oscillation can’t start again.
With error storing and attenuation of the oscillation by overtemperature it can be defined via selection of the
temperature mode, whether the oscillation is automatically triggered after cooling-down of the assembly, or
only after mains disconnection.
Absolute Maximum Ratings
Pin Symbol
min max
current consumption
VCC
ICCeff
20
peak current for t< 100 µs
VCC
ICCM
100
input voltage error indicator
EI
VErr
-0.3 VCC
input voltage lamp
LW VLW
-0.3 15
exchange input
voltage difference between
LW
VLW - VCC
6
VLW and VCC for
divider factor 16 via LW
input current at pin TM
negative current load
for t<1µs with max. repeat
TM ITM
TR ITR(neg.)
1
-500
frequency = 200kHz
switching output current
junction temperature
S IS
Tj
1
150
storage temperature
ambient temperature
ESD protection
Tstg
Tamb
VESD
-50 150
-20 120
2
unit
mA
mA
V
V
V
mA
mA
mA
°C
°C
°C
kV
2


Part Number KKA3354
Description IC
Maker KODENSHI KOREA
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