BD93941EFV Datasheet, PDF (15/30 Pages) Rohm – LED pin rating 60V

BD93941EFV BD93941FP
Datasheet
Timer Latch Time Setting
This IC has a built-in timer latch counter. Timer latch time is set by counting the clock frequency which is
set at the RT pin. After
Timer Latch Time
When various abnormal conditions happen, counting starts from the timing, latch occurs after below time has passed.
Furthermore, even if PWM=L, if abnormal condition continues, timer count will not reset.
LATCH_TIME
 2¹²
 ^RRT
1.5 10¹⁰

4096
R_RT [k]
1.5 10⁷
[s]
Here, LATCH_TIME = time until latch condition occurs
R_RT = Resistor value connected to RT pin
Figure 16. Example of LED Short protection timing chart
【Setting Example】
Timer latch time when RT=75kohm
LATCH_TIME
 4096 ^{RRT [k]}
1.510⁷
 4096 ^75[k]
1.510⁷
 0.02[s]　
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TSZ22111・15・001
15/27
TSZ02201-0F1F0C100270-1-2
10.Oct.2013 Rev.001