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BA00DD0WHFPTR 데이터시트(PDF) 10 Page - Rohm

부품명 BA00DD0WHFPTR
상세설명  2A/1A Variable Output
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
Logo ROHM - Rohm

BA00DD0WHFPTR 데이터시트(HTML) 10 Page - Rohm

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Datasheet
Datasheet
BD60A00NUX
BD60A60NUX
© 2012 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
TSZ02201-0G3G0C200320-1-2
27.SEP.2012 Rev.001
●Operating of the application deficiency
1) When 1 LED or 1string OPEN during the operating
Since FB terminal is set to 0V when set to OPEN, Output boosts up to the over voltage protection voltage. When over
voltage is detected, the boosting operation stops and then output voltage goes down slowly. Later, if output voltage
becomes less than hysteresis of over current protection, output voltage keeps boosting up to over voltage protection
voltage again.
Figure 3. LED open detect
2) When LED short-circuited in the plural
Even if one LED short-circuits during boost operation, it usually passes along LED and it is turned on. By making LED
shorted, FB terminal voltage increases by LED VF. Therefore output voltage becomes lower by LED VF, and the
condition turns to be normal.
Figure 4. One LED shorted
Figure 5. FB terminal – VOUT terminal shorted
FB
FB
output
Vout
FB voltage
LED
connection
normal
Open
LED current
20mA
0mA
Hysteresis voltage
0.7V+VF of LED
FB
VOUT
LED current
20mA
0.7V
LED short
VF of LED
VF of LED
FB
VOUT
FB
VOUT
LED current
20mA
0.7V
LED short
VIN
5.9V
0.1mA
100µs


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