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BD6142AMUV
Datasheet
● Operating of the application deficiency
1)When 1 LED or 1string OPEN during the operating
The LED string which became OPEN isn't lighting, but other LED strings are lighting.
Then LED terminal is 0VOUTput boosts up to the over voltage protection voltage. When over voltage is detected, the
feedback of open string isn’t returned, so that VOUT will return normal voltage.
ENABLE, PWM
VOUT
OVP
CH1 connection connect
CH2 connection
open
connect
CH 1
CH 2
CH1 voltage
CH1 enable
100 μ s
Feedback
CH1
CH2
OFF
CH1
CH1 current 20mA
0mA
CH2 current
20mA
0mA
Figure 18. LED open protect
2)When LED short-circuited in the plural
All LED strings is turned on unless CH1 to 8 terminal voltage is more than 5V(typ.).
When it was more than 5V only the strings which short-circuited is turned off normally and LED current of
other lines continue to turn on. Short line(CH1) current is changed from 20mA to 0.05mA(typ.), so CH1 terminal don’t heat.
LED short
Typ 5V
CH1terminal
CH2 terminal
VOUT
0.8V
CH1>C
0.8V
CH 1
FeedBack
CH1
CH2
100 μ s(typ.)
CH 2
CH1 current
CH2 current
20mA
20mA
0.05mA(typ.)
Figure 19. LED short protect
3)When Schottky diode remove
All LED strings aren’t turned on. Also, IC and a switching transistor aren't destroyed because boost operating stops by the
Schottky diode open protected function.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
12/30
TSZ02201-0G3G0C400340-1-2
03.Dec.2012 Rev.001
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