BD92111F Datasheet, PDF (17/28 Pages) Rohm – PFC Direct current resonance type White LED Driver for Large LCD

BD92111F
Timing Chart
When it Detects Quick Detection Type Error
STB
2.0V
(A)
3.0V
SS
SDON
2.0V
FB
IS
0.625V
1.25V
0.7V
1.25V
VS
1
0.625V
2.0V
1.25V
4.0V
4.0V
COMP
2
COMSD ^4.0V
2.0V
CP
FAIL
Figure. 25 Timing Chart 1
[The explanation of quick abnormal detection]
Due to the timing of ① to② in the above chart, the IC detects malfunction and starts the output-mute latch without CP
Charge . For ① to②, 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<0.625V
②
COMPSD Over Voltage detection
COMPSD≥ 4.0V
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31.Jan.2016 Rev.001