BD9422EFV_15 Datasheet, PDF (14/30 Pages) Rohm – White LED Driver for large LCD panel

BD9422EFV
Datasheet
●3.3 Protection operation when the FAIL one shot outputs(FAILMODE=H)
●3.3.1 List of the threshold function terminal （typ. condition）
Please decide the resistance divider of the various protection detection using the following table.
Protection
name
Detection
Pin name
Detection
condition
PWM
Release condition
Protection type
LED Open
LED short
LEDx
LEDx
LEDx < 0.2V(4clk)
SS>3V
LEDx > 5×VLSP(4clk)
SS>3V
High
High
LEDx > 0.2V(3clk)
LEDx < 5×VLSP(3clk)
FAIL drain state under the
detection.
FAIL drain state under the
detection.
UVLO
UVLO
UVLO < 2.3V
―
UVLO > 2.5V
Stop the system.
OVP
SCP
OCP
OVP
OVP
CS
OVP > 2.43V
―
OVP < 0.2V
―
CS > 0.45V
―
OVP < 2.4V
OVP > 0.2V
CS < 0.45V
Stop the system
FAIL drain state under the
detection..
Stop the system.
FAIL drain state under the
detection..
Stop the N output under the
detection.
（Pulse by Pulse）
●3.3.2 List of the protection function
Protection
function
DC/DC converter
Action when protection function is detected
LED driver
Soft-start
STB
LED Open
LED short
Stop
Normal operation
(Stop when the all CH
stop)
Normal operation
Stop
Normal operation
Normal operation
Discharge
Normal operation
Normal operation
UVLO
Stop
Stop
Discharge
OVP
Stop the N output
Normal operation
Normal operation
SCP
OCP
Stop the N output
Stop the N output
(Pulse by Pulse)
Normal operation
Normal operation
Normal operation
Normal operation
FAIL terminal
OPEN
DRAIN under
the detection
DRAIN under
the detection
DRAIN
DRAIN
DRAIN
OPEN
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TSZ22111・15・001
14/26
TSZ02201-0F1F0C100210-1-2
1.Sep.2015 Rev.006