BD9479FV ROHM [Rohm], BD9479FV Datasheet - Page 24

• Manufacturer Part Number: BD9479FV
• Description: White LED Driver for large LCD Panels (DCDC Converter type)
• Manufacturer: ROHM [Rohm]

● ● ● ● List of Protect Function (typ condition)
(CP does not charged under Soft start duration.)
*When abnormality is detected under PWM=H, CP will continue to charge even if PWM=L.
To release the latch function, STB should be set from “L” to “H”.(CP does not charged under Soft start duration.)
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TSZ22111・15・001
BD9479FV
To release the latch function, STB should be set to “L” once, and then to “H”.
Protect Function
LED SHORT
LED OPEN
Protection
LED Open
Feedback
LED short
Name
UVLO
UVLO
OCP
OCP
OVP
OVP
SCP
OVP
SCP
STB
Detection
after CP charged
after CP charged
after CP charged
REG50
N output stops
Instantaneously
Stops operating
Stops operating
Instantaneously
Stops operating
N pin limits duty
UVLO
VCC
OVP
OVP
OVP
BSx
BSx
CLx
Pin
CS
DC/DC
stops
stops
cycle
UVLO < 2.79V
REG50 < 4.2V
Detection Pin
OVP > 2.25V
VCC < 7.2V
OVP > 2.5V
OVP < 0.2V
BSx < 0.1V
CLx < 0.1V
Condition
CS > 0.4V
BSx > 9V
Stops operating
Stops operating
Stops operating
Stops operating
Detect Condition
Operation after protect function detects error
Instantaneously stops
Instantaneously stops
Normal operation
LED Driver
charged
charged
charged
charged
24/26
PWM
H
H
H
H
-
-
-
-
-
-
after CP
after CP
after CP
after CP
SS > 4V
SS > 4V
SS > 4V
SS > 4V
SS
-
-
-
-
-
-
Discharge after
Discharge after
Discharge after
Discharge after
CP discharged
CP discharged
CP discharged
CP discharged
Instantaneously
Instantaneously
Soft Start
discharged
discharged
operation
Normal
REG50 > 4.5V
OVP < 2.25V
VCC > 7.5V
OVP < 2.5V
OVP > 0.2V
BSx > 0.1V
UVLO > 3V
CLx > 0.1V
Condition
CS < 0.4V
BSx < 9V
Release
TSZ02201-0F1F0C100020-1-2
GND after CP charged
GND after CP charged
GND after CP charged
GND after CP charged
9.Aug.2012 Rev.001
Latch
N output stops
(Pulse-by-pulse and
(200ns Mask from
Pulse-by-pulse
Protect type
Auto-Restart
FAIL Pin
gate is OFF)
Auto-restart
Auto-restart
OPEN
OPEN
Gate ON)
GND
Latch
Latch
Latch
Latch
Datasheet