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BD1754HFN 데이터시트(PDF) 7 Page - Rohm

부품명 BD1754HFN
상세설명  Constant Current LED Driver
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
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BD1754HFN 데이터시트(HTML) 7 Page - Rohm

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BD1754HFN
Datasheet
TSZ02201-0G3G0C200060-1-2
10.Dec.2015 Rev.002
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Application Information
1. Description of Operations
(1) UPIC (= Uni-Port Interface Control) interface
BD1754HFN has a single-line digital control interface (UPIC) that can control the power ON/OFF and LED current
value through the EN pin. The LED current decreases by one step depending on the number of rising edges. When
the minimum output current is reached (64 rising edges), the next rising edge changes the output current to the
maximum value at startup time. To maintain any output current, the EN pin must be kept at ‘H’ level. To power OFF,
the EN pin must be kept
at ‘L’ level for more than 1msec.
MAX Current
MAX Current
EN
ILED
(Internal)
State
C64
C63
C62
C61
C62
C60
C2
C1
C64
C63
tHI
tLO
tOFF
OFF
OFF
MIN Current
OFF
OFF
Figure 10. Brightness Control Method
EN
tHI
tLO
tOFF
Figure 11. UPIC Interface
By the following sequence, UPIC can control the current driver for MAX current and OFF state only.
Figure 12. UPIC Interface Usage for MAX current or OFF Only
MAX
Current
MAX
Current
EN
ILED
(Internal)
State
C64
C64
tOFF
OFF
OFF
OFF
tOFF
OFF
OFF
OFF


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