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| BD9285F Datasheet, PDF (30/39 Pages) Rohm – Boost 1channel white LED driver For large LCDs | |||
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BD9285F
3.7.5 the OVP detection
Datasheet
(*1)â¦As OVP is detected, the output GATE=L, DIMOUT=L, and the CP counter starts
(*2)â¦If OVP is released within 4 clock of CP counter of the GATE pin frequency, the boost operation restarts.
(*3)â¦As the OVP is detected again, the boost operation is stopped.
(*4)â¦As the OVP detection continues up to 4 count by the CP counter, IC will be latched off.
(*5)â¦As the latched off, the boost operation doesn't restart even if OVP is released.
(*6)â¦The STB=L input can make IC reset. In this chart, DIMOUT asserts high by the discharge function in the paragraph 3.7.3.
(*7)â¦It normally starts as STB turns L to H.
(*8)â¦The operation of the OVP detection is not related to the logic of PWM.
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TSZ02201-0F1F0C100030-1-2
11.Jul.2012 Rev.001
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