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| BD9285F Datasheet, PDF (33/39 Pages) Rohm – Boost 1channel white LED driver For large LCDs | |||
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BD9285F
3.7.8 LED OCP detection
Datasheet
(*1)â¦If ISENSE>4.0V, LEDOCP is detected, it becomes GATE=L. To detect LEDOCP continuously, The DIMOUT is
compulsorily high, regardless of the PWM dimming signal.
(*2)â¦When the LEDOCP releases within the GATE frequency 4096 counts of the CP counter, the boost operation restarts.
(*3) â¦As the LEDOCP is detected again, the boost operation is stopped, too.
(*4)â¦If the LEDOCP detection continues up to 4096 count with the CP counter, IC will be latched off.
(*5)â¦Once IC is latched off, the boost operation doesn't restart even if the LEDOCP releases.
(*6)â¦The latch off state can be reset by the STB=L. In this chart, DIMOUT asserts high by the discharge function in the
paragraph 3.7.3.
(*7)â¦It normally starts by STB=L to H.
(*8)â¦The operation of the LEDOCP detection is not related to the logic of the PWM.
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© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0F1F0C100030-1-2
11.Jul.2012 Rev.001
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