Features: ·Minimum wiring complexity
·Overtemperature protection without external components
·Malfunction detection
·Timer output
·Automatical reignition after lamp changeSpecifications
| |
Pin |
Symbol |
min |
max |
unit |
| current consumption |
VCC |
ICCeff |
|
20 |
mA |
| peak current for t< 100 µs |
VCC |
ICCM |
|
100 |
mA |
| input voltage error indicator |
EI |
VErr |
-0.3 |
VCC |
V |
input voltage lamp
exchange input |
LW |
VLW |
-0.3 |
15 |
V |
voltage difference between
VLW and VCC for
divider factor 16 via LW |
LW |
VLW - VCC |
|
6 |
V |
| input current at pin TM |
TM |
ITM |
|
1 |
mA |
negative current load
for t<1µs with max. repeat
frequency = 200kHz |
TR |
ITR(neg.) |
-500 |
|
mA |
| switching output current |
S |
IS |
|
1 |
mA |
| junction temperature |
|
Tj |
|
150 |
°C |
| storage temperature |
|
Tstg |
-50 |
150 |
°C |
| ambient temperature |
|
Tamb |
-20 |
120 |
°C |
| ESD protection |
|
VESD |
|
2 |
KV |
DescriptionAt the moment of current feeding at terminal VCC, the IC ILA3354 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. ILA3354 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 ILA3354 starts a counter, which interrups the control after one second.
Furthermore, the IC ILA3354 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 of ILA3354 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. ILA3354 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 ILA3354 extremly quickly.
Thereby, the current consumption increases by the control of the turn-off transistor. This current amounts of ILA3354 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 ILA3354 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 ILA3354 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.
ILA3354 Data Sheet
