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参数资料
| 型号： | BD1754HFN-TR |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 8-HSON |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性 |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-HSON |
| 供应商设备封装： | 8-HSON |
| 包装： | 标准包装 |
| 工作温度： | -30°C ~ 85°C |
| 其它名称： | BD1754HFN-DKR BD1754HFN-DKR-ND BD1754HFNDKR |
BD1754HFN
(5) Circuit example when driving a large current with only one LED powered on.
ILED=128mA
Datasheet
L1
L2
L3
L4
VIN
Cin
0.1μF
EN
UPIC
6
Current
DAC
ISET
R ISET
120k ?
GND
(When ILED-max =32mA)
Figure 20. 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 k ? R ISET , 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 k ? R ISET 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
ILED=32mA
ILED=32mA
L1
L2
L3
L4
L1
L2
L3
L4
VIN
VIN
Cin
0.1μF
EN
UPIC
6
Cin
0.1μF
EN
UPIC
6
Current
DAC
ISET
Current
DAC
ISET
R ISET
120k ?
R ISET
120k ?
GND
(When ILED-max =32mA)
GND
(When ILED-max =32mA)
Figure 21. 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.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
11/16
TSZ02201-0G3G0C200060-1-2
9.NOV.2012 Rev.001
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