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Электронный компонент: ILA3354

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TECHNICAL DATA
ILA3354
IC for Electronic Ballasts
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
TM
temperature mode selection
Pin 2
CT
clock generator
Pin 3
TR
trigger output, turn-off attenuation, oscillation detector
Pin 4
GND
connection to ground
Pin 5
EI
error indication input
Pin 6
LW
input of lamp change
Pin 7
S
switching output of the timer
Pin 8
V
CC
supply voltage
Block diagram

Characteristics of the IC
The ILA3354 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.
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ILA3354




Functional Description
At the moment of current feeding at terminal V
CC
, 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 s. 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 s. 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 V
CC
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
unit
current consumption
V
CC
I
CCeff
20 mA
peak current for t< 100 s
V
CC
I
CCM
100
mA
input voltage error indicator
EI
V
Err
-0.3 V
CC
V
V
input voltage lamp
exchange input
LW V
LW
-0.3 15
voltage difference between
V
LW
and V
CC
for
divider factor 16 via LW
LW V
LW
-
V
CC
6 V
input current at pin TM
TM
I
TM
1 mA
negative current load
for t<1s with max. repeat
frequency = 200kHz
TR I
TR(neg.)
-500
mA
switching output current
S
I
S
1
mA
junction temperature
T
j
150
C
storage temperature
T
stg
-50 150 C
ambient temperature
T
amb
-20 120 C
ESD protection
V
ESD
2 kV
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ILA3354



Characteristics
with Tamb = 25 C, V
CC
= 10 V, unless specified otherwise
Pin
Symbol
min
typ
max
unit
range for internal voltage
limitation
V
CC
V
lim
10.8 11.4 12 V
quiescent current
consumption
V
CC
I
CC(on)
1.25
1.5
mA
trigger repeat rate with
C
Clock
= 82pF
TR t
TRW
900 1000 1100 s
output pulse current
on 10
TR I
TRM
400 650 850 mA
output pulse width with
90% amplitude
TR t
TR
0.6 0.9 1.5 s
saturation voltage of
turn-off transistor
with I=450 mA
TR V
TRsat
380 500 mV
saturation voltage of
switching output
S V
Ssat
0.2
0.45
V
response level of error
voltage
EI K
OL
3.60 3.75 3.90 V
switching point of
overtemperature turn-off
T
S
95 105 115 C
switching range to indicate
a lamp as removed
LW V
LE
3.25
V
switching range to indicate
a lamp as applied
LW V
LV
4.25
V
CC V
Parameter Condition
Value
Unit
Threshold for connecting the trigger pulses during
build-up phase
C
Clock
= 82pF
7
V
Threshold for release of the internal reset
C
Clock
= 82pF
8
V
Threshold for switching-off the control of the turn-off
transistor with set error memory
C
Clock
= 82pF
6
V
Delay of response with error detection
C
Clock
= 82pF
1
s
Duration for activation switching output
C
Clock
= 82pF
1
s
Duration needed for rating at least 4 pulse-shaped
distortions or a static error signal with twice
interrogation within delay time 1 sec
C
Clock
= 82pF
840
s
Control current of the turn-off transistor
C
Clock
= 82pF
10
mA
Temperature hysteresis for re-ignition after
overtemperature switch-off ( pin TM is connected to
ground )
C
Clock
= 82pF
10
C






3
ILA3354




Current consumption vs. supply voltage
Voltage limiting vs. temperature I
CC
= 5 mA


Static overload threshold V
CC
= 10 V
Timer output saturation voltage at 1mA
V
CC
= 10 V
Trigger current at 10
vs. temperature, V
CC
= 10 V

Trigger pulse width (90% amplitude)
vs. temperature, V
CC
= 10 V
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ILA3354

Principle Circuit Diagram
ILA3354

Application Circuit Diagram
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