BD9486F_16 datasheet(29/38 Pages) ROHM

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TSZ02201-0F1F0C100240-1-2

15.Feb.2016 Rev.006

www.rohm.com

TSZ22111・15・001

BD9486F

3.5.7 LED OCP Detection

STB

3.0V

Abnormal

COUNTOR

ISENSE

GATE

DIMOUT

Smaller than

4count

NORMAL

LEDOCP

(OFF)

NORMAL

abnormal

Reset

(*1)

(*2)

(*3)

(*4) (*5)

NORMAL

Latch off

STATE

(*6)

(*7)

(*8)

abnormal

LEDOCP

PWM

0.4V

3.0V

Latch off

2.0V

REG50

Figure 38. LED OCP Detection

(*1)…If ISENSE>3.0V, LEDOCP is detected, and GATE becomes L. To detect LEDOCP continuously, The DIMOUT is

compulsorily high, regardless of the PWM dimming signal.

(*2)…When the LEDOCP releases within 4 counts of the GATE frequency, the boost operation restarts.

(*3) …As the LEDOCP is detected again, the boost operation is stopped.

(*4)…If the LEDOCP detection continues up to 4 counts of GATE frequency. IC will be latched off.

(*5)…Once IC is latched off, the boost operation doesn't restart even if the LEDOCP releases.

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

(*7)…It normally starts by STB=L to H.

(*8)…The operation of the LEDOCP detection is not related to the logic of the PWM.

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