BD9285F ROHM [Rohm], BD9285F Datasheet - Page 15

• Manufacturer Part Number: BD9285F
• Description: Boost 1channel white LED driver For large LCDs
• Manufacturer: ROHM [Rohm]

To reset the latch type protection, please input of STB logic to ‘L’ once. Otherwise the detection of VCCUVLO, TC54UVLO is
required.
●3.3 The behavior list of the protection
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
BD9285F
●3.2 The detection condition list of the protection (TYP. Condition)
Please refer to the timing chart in the section 3.7 for the detail.
TC54 UVLO
VCC UVLO
LED OPEN
Protection
Protect Function
LED OCP
UVLO
OVP
OCP
SCP
TC54 UVLO
LED OPEN
VCC UVLO
LED OCP
UVLO
OCP
STB
OVP
SCP
ISENSE
ISENSE
Detectio
UVLO
TC54
n pin
VCC
OVP
OVP
CS
Stops immediately
Stops immediately
Stops immediately
Stops immediately
Stops immediately
Stops immediately
Stops immediately
Stops immediately
Stops after latch
DC/DC Gate
output
ISENSE < 0.1V
ISENSE > 4.0V
pin condition
UVLO<2.8V
TC54<2.4V
VCC<7.2V
OVP>3.0V
OVP<0.2V
CS>0.5V
Detect condition
H immediately, L after latch
Dimming transistor
H after 4clk, L after latch
PWM1 and
(DIMOUT) logic
H(4ck)
Normal operation
PWM2
L if TC54<2.4V
immediately L
immediately L
immediately L
immediately L
immediately L
-
-
-
-
-
-
-
The operation of the protection
15/36
SS>3.0V
SS>3.0V
SS
-
-
-
-
-
-
ISENSE > 0.1V
ISENSE < 4.0V
discharge immediately
discharge immediately
discharge immediately
discharge immediately
UVLO>3.0V
OVP>0.25V
TC54>2.5V
VCC>7.5V
OVP<2.9V
discharge after latch
discharge after latch
discharge after latch
discharge after latch
condition
Release
Not discharge
Soft Start
-
TSZ02201-0F1F0C100030-1-2
4096 count
4096 count
4096 count
operation
4 count
Timer
NO
NO
NO
NO
immediately L
immediately L
immediately L
FAILB pin
L after latch
L after latch
L after latch
L after latch
11.Jul.2012 Rev.001
OPEN
OPEN
Protection type
Pulse by Pulse
Auto recovery
Auto recovery
Auto recovery
Latch off
Latch off
Latch off
Latch off
Datasheet