BD9394FP Datasheet, PDF (23/31 Pages) Rohm – White LED Driver for large LCD Panels (DCDC Converter type)

BD9394FP, BD9394EFV
Datasheet
●List of Protect Function (typ condition)
Protection
Name
Detection
Pin
Detection Conditions
Detection pin PWM SS
LED OPEN
LEDｘ
LEDx < 0.2V
H
SS>3.7V
LEDSHORT
LEDｘ
ISET GND
SHORT
REG58 UVLO
VCC UVLO
OVP
ISET
REG58
VCC
OVP
LEDx > 5V
(LSP=OPEN)
Under
ISET×90%
REG58<2.4V
VCC<7.3V
OVP>3.0V
H
SS>3.7V
-
-
-
-
-
-
-
-
SCP
OVP
OVP<0.1V
-
-
Cancellation
Conditions
LEDx > 0.2V
LEDx < 5V
(LSP=OPEN)
Above
ISET×90%
REG58>2.6V
VCC>7.5V
OVP<2.9V
OVP>0.1V
FB OVER SHOOT
FB
OCP
CS
FB>4V
OCP>0.45V
-
-
-
-
FB<3.6V
-
Protection Type
Immediately Auto-Restart after
detection
(Judge periodically whether normal or
not)
Immediately Auto-Restart after
detection
(Judge periodically whether normal or
not)
Auto-Restart
Auto-Restart
Auto-Restart
Auto-Restart
Immediately Auto-Restart after
detection
(Judge periodically whether normal or
not)
Immediately Auto-Restart after
detection
(Judge periodically whether normal or
not)
Pulse-by-Pulse
To clear the latch type, STB should be set to “L” once, and then to “H”.
Protection Function
LED OPEN
LEDSHORT
ISET GND SHORT
STB
REG58 UVLO
VCC UVLO
OVP
SCP
FB OVER SHOOT
OCP
Operation after the protection function detected
DC/DC
Continue to operate
Continue to operate
Stop immediately
LED Driver
Only detects LED,
stops after CP count
Only detects LED,
stops after CP count
Stop immediately
Soft-start
Continue to operate
Continue to operate
Continue to operate
Stop immediately
Stop(and when REG58<2.4V)
Discharge immediately
Stop immediately
Stop immediately
Discharge immediately
Stop immediately
Stop immediately
Discharge immediately
Stop immediately (N pin only)
Continue to operate
Continue to operate
Stop immediately (N pin only)
Stop after CP count
Discharge after CP count
Stop after CP count
Stop after CP count
Continue to operate
N pin limits DUTY
Stop immediately
Continue to operate
* CP = 20msec (RT=75Kohm)
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TSZ22111・15・001
23/28
TSZ02201-0F1F0C100180-1-2
09.Nov.2012 Rev.002