BD9483F Просмотр технического описания (PDF) - ROHM Semiconductor

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BD9483F

White LED Driver for large LCD Panels (DCDC Converter type)

ROHM Semiconductor 

BD9483F,FV

●3.7.5 FBMAX detection

Datasheet

Figure 37.

(*2)…During the soft start, it is not judged to the abnormal state even if the FB=H(FB>4.0V).

(*3)…When the PWM=H and FB=H, the abnormal counter doesn’t start immediately.

(*4)…The CP charge will start if the PWM=H and the FB=H detection continues 8 clock of the GATE frequency. Once the count

starts, only FB level is monitored.

(*5)…When the FBMAX detection continues till the CP charge reaches to 3.0V, IC will be latched off. The latch off interval can

be calculated by the external capacitance of CP pin. (Please refer the section 3.4.7.) In latch off mode, both CH1 and CH2

will be stopped.

(*6)…The latch off state can be reset by the STB=L.

(*7)…It is normally started by PWM=L to H, in this Figure.

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