AN993

Dimming the lamp

Doc ID 5656 Rev 10

25/27

6.1

Dimming level and lamp turn-on

dimming level, and it is only after this that the lamp’s turn-on frequency moves towards

drawback of causing a "flash" that can be unpleasant. As the minimum length of this delay

depends on the type of lamp, it is better to set it as low as possible, finding the best

compromise.

The easiest way to set this delay is to act on the amplifier’s compensation, that is, on C9: the

higher C9, the longer the delay and the easier the lamp turn-on. Values up to 200 nF and

more are commonly used.