BD9397EFV 데이터 시트보기 (PDF) - ROHM Semiconductor

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BD9397EFV

White LED Driver for large LCD panel

ROHM Semiconductor 

BD9397EFV

●3.7.3 Protective operation sequence at FAIL_MODE=H

・Basic sequence

Datasheet

・Actual sequence

Error detect

MASK synchronize

(4clk) (3clk) CP charge time

(CLK)

Figure 28.

CP reset time

(1024clk)

…

…

2V detect hold CP reset time

CP charge time

(3clk) (1024clk)

…

…

…

(ERR)

2V

CP

FAIL

PWM*

LED*

SHORT detect state

SHORT detect state

After it pasts CP charge time and CP

reset time, FAIL Output 1shot pulse.

LSP detect voltage

If error signal input in this period, it is ignored.

Discharge CP by 2 times error signal

Charge is started at 1 times error detect, but it moved to reset period at 2 times error

detect immediately, therefore error signal can’t be detected.

Figure 29.

The above chart is sample of SHORT detection, but the chart of OPEN detection is also same structure.

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