BD94121F Datasheet, PDF (15/28 Pages) Rohm – PFC Direct current resonance type White LED Driver for Large LCD

BD9412F
Detection Condition List of the Protection Functions (Typ Condition)
Protect
Function
Detection
Pin
Detect Condition
Detection Condition
SS
Release Condition
LED OPEN
(ADIM<0.44V)
IS < 0.05V
IS
(0.44V<ADIM<2.2V)
IS < ADIM/8.8
(ADIM>2.2V)
IS < 0.25V
SS>2.0V
(ADIM<0.44V)
IS > 0.05V
(0.44V<ADIM<2.2V)
IS > ADIM/8.8
(ADIM>2.2V)
IS > 0.25V
LED SHORT
IS
IS > 1.0V
SS>2.0V
IS < 1.0V
Timer
Operation
2CLK
2CLK
Protection
Type
Latch off
Latch off
OVP
VS
VS > 1.25V
SS>2.5V
VS < 1.25V
CP
Latch off
VCC UVLO
VCC
VCC < 7.5V
-
VCC > 8.0V
-
Restart by
release
COMPSD COMPSD
COMPSD > 4.0V
SS>2.0V
COMPSD < 3.8V
2CLK
Latch off
To reset the latch type protection, please set STB logic to ‘L’ once. Otherwise the detection of VCCUVLO is required. The count number in the list is calculated
with double of output frequency.
Behavior List of the Protect Function
Protect Function
LED OPEN
LED SHORT
OVP
VCC UVLO
COMPSD
N1,N2 Output
Stop after latch
Stop after latch
Stop after latch
Stop immediately
Stop after latch
Operation of the Protect Function
SS pin
Low after latch
Low after latch
Low after latch
Low Immediately
Low after latch
FAIL pin
High after latch
High after latch
High after latch
High Immediately
High after latch
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TSZ22111 • 15 • 001
15/24
TSZ02201-0F5F0C100100-1-2
22.Feb.2016 Rev.001