Revision 1.8

13 - 20

AS3833

Datasheet - D e t a i l e d D e s c r i p t i o n

8.3.4

Open LED detection

Figure 14. Open Led detection

A broken LED-string is detected during PWM=1. If a LED-string is broken the power supply feedback will increment the IDAC to increase the

power supply output voltage. After the IDAC has reached its maximum value, a debounce counter is started. In order to run the debounce

counter, the corresponding PWM-signal has to be high for more than 150us. After the debounce counter has counted up for 32ms, the fault

output is activated (xFAULT = 0) and the corresponding output is disconnected from the power supply feedback loop.

8.4 Boost controller

Figure 15. Boost controller