ILA3354

2011, February, Rev. 01

Functional Description

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 interrupts 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 enquired 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

extremely quickly.

Thereby, the current consumption increases by the control of the turn-off transistor. This current amounts more

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 over temperature 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

Parameter

Pin

Symbol

min

max

Unit

current consumption

20

mA

peak current for t< 100 µs

100

mA

input voltage error indicator

EI

-0.3

V

input voltage lamp

exchange input

LW

-0.3

15

V

voltage difference between

divider factor 16 via LW

LW

CC

6

V

input current at pin TM

TM

1

mA

negative current load

for t<1µs with max. repeat

frequency = 200kHz

TR

-500

mA

switching output current

S

1

mA

junction temperature

150

°C

storage temperature

-50

150

°C

ambient temperature

-20

120

°C

ESD protection

2

kV

* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.

These are stress ratings only and functional operation of the device at these or any other conditions beyond those

indicated under “recommended operating conditions” is not implied.

Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.