BD94121F Datasheet, PDF (17/28 Pages) Rohm – PFC Direct current resonance type White LED Driver for Large LCD

BD9412F
Timing Chart
When it Detects Quick Detection Type Error
STB
2.0V
2.5V
SS
2.0V
FB
ADIM/4.4
IS
1.25V
VS
1
ADIM/8.8
2.5V
2.0V
ADIM/4.4
1.0V
2
COMPSD ^4.0V
2.5V
2.0V
2.0V
CP
FAIL
1.25V
3
Figure. 26 Timing Chart 1
[The explanation of quick abnormal detection]
Due to the timing of ① to ③ in the above chart, the IC detects malfunction and starts the output-mute latch without CP
Charge . For ① to ③, the malfunction is detected according to the conditions in the table shown below.
No.
Content of Abnormal Detection
Condition of Abnormal Detection
①
Abnormal LED current detection
IS<(ADIM/8.8)V
②
Abnormal LED short detection
IS>1.0V
③
COMPSD Over Voltage detection
COMPSD≥ 4.0V
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TSZ02201-0F5F0C100100-1-2
22.Feb.2016 Rev.001