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BD1754HFN 数据表(PDF) 8 Page - Rohm

部件名 BD1754HFN
功能描述  Constant Current Backlight Driver for LCD Panels (Non-step-up Type)
Download  12 Pages
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制造商  ROHM [Rohm]
网页  http://www.rohm.com
标志 ROHM - Rohm

BD1754HFN 数据表(HTML) 8 Page - Rohm

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Technical Note
8/11
BD1754HFN
www.rohm.com
2011.06 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
(5) Circuit example when driving a large current with only one LED powered on.
VIN
ISET
GND
Current
DAC
UPIC
6
EN
L2
L1
0.1µF
L4
L3
(When
ILED-max=32mA)
120kΩ
ILED=128mA
Cin
RISET
Fig.18
Circuit example when driving a large current with only one LED powered on.
This figure shows a circuit example when driving a large current through all of four channels with only one LED
powered on. By shorting out all the LED driver pins, in the example of using 120 kΩ RISET, a current up to 128 mA (32
mA x 4) can be driven. In this example, the brightness can be adjusted in 64 gradations with 2 mA step (0.5 mA
step/channel x 4 channels). For higher current values, using 60 kΩ RISET allows a current up to 256 mA to be driven
into one of the LEDs. The power ON/OFF and the brightness of the LEDs are controlled through the EN pin in
accordance with the UPIC format.
(6) Circuit example when making the eight LEDs available by connecting the two BD1754HFN drivers
VIN
ISET
GND
Current
DAC
UPIC
6
EN
L2
L1
0.1µF
L4
L3
(When
ILED-max=32mA)
120kΩ
ILED=32mA
VIN
ISET
GND
Current
DAC
UPIC
6
EN
L2
L1
L4
L3
(When
ILED-max=32mA)
120kΩ
ILED=32mA
0.1µF
Cin
RISET
Cin
RISET
Fig.19
Circuit example when making the eight LEDs available by connecting the two BD1754HFN drivers
This figure shows a circuit example when making eight LEDs available by connecting two BD1754HFN drivers.
By connecting the control signals to the EN pins in parallel, the eight LED channels can be controlled concurrently.
This parallel connection scheme can increase the number of the LED channels further as necessary (such as twelve,
sixteen, or more). Determine the resistance value with which the LED current value is maximized and then connect
such resistor between the ISET and the GND pins. The power ON/OFF and the brightness of the LEDs are controlled
through the EN pin in accordance with the UPIC format.


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