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LED Driver ICs Forum Discussions

User20588
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First question asked
Level 1
If one TLE4242G shows a fail, also the other shall fail. Is there the risk that the circuit latches?
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j_oehmen
Moderator
Moderator 10 replies posted 5 replies posted 10 questions asked
Moderator
I don’t see here a risk for a latching function as the status functionality of the TLE4242 is unlatched.

When a fault is detected by one of the devices, this one pulls down the ST pin using an open collector circuit. This pulls down the connected PWM pin of the second device and brings it into sleep mode.
4812.attach

When the fault condition is removed the device which has detected the fault releases the ST pin (open collector output off) and the ST pin voltage rises again. The second device connected with its PWM pin to this ST pin is then activated again and both devices are back in normal operation.

Read more on our LITIX Linear page.

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j_oehmen
Moderator
Moderator 10 replies posted 5 replies posted 10 questions asked
Moderator
I don’t see here a risk for a latching function as the status functionality of the TLE4242 is unlatched.

When a fault is detected by one of the devices, this one pulls down the ST pin using an open collector circuit. This pulls down the connected PWM pin of the second device and brings it into sleep mode.
4812.attach

When the fault condition is removed the device which has detected the fault releases the ST pin (open collector output off) and the ST pin voltage rises again. The second device connected with its PWM pin to this ST pin is then activated again and both devices are back in normal operation.

Read more on our LITIX Linear page.
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