BD9422EFV Datasheet, PDF (14/28 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
PWM
Protection type
LED Open
LEDx
LEDx < 0.2V
SS>3V
High
LEDx > 0.2V
High/Low
FAIL drain state under the
detection.
LED short
LEDx
LEDx > 5×VLSP
SS>3V
High
LEDx < 5×VLSP
High/Low
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 < 2.4V
OVP < 0.2V
―
OVP > 0.2V
CS > 0.45V
―
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
DC/DC converter
STB
LED Open
LED short
STB
LED Open
LED short
Stop
Normal operation
(Stop when the all CH
stop)
Normal operation
Stop
Normal operation
Normal operation
FAIL terminal
Discharge
Normal operation
Normal operation
UVLO
UVLO
Stop
Stop
Discharge
OVP
OVP
Stop the N output
Normal operation
Normal operation
SCP
OCP
SCP
OCP
Stop the N output
Stop the N output
(Pulse by Pulse)
Normal operation
Normal operation
Normal operation
Normal operation
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TSZ22111・15・001
14/25
TSZ02201-0F1F0C100210-1-2
31.May.2013 Rev.003