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参数资料
| 型号： | BD1754HFN-TR |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/19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
(3) Circuit example when the EN pin is powered on at all times
Datasheet
L1
L2
L3
L4
VIN
Cin
0.1μF
Rs
EN
UPIC
Cs
6
Current
DAC
ISET
R ISET
120k ?
GND
(When ILED-max =32mA)
Figure 18. Circuit example when the EN pin is powered on at all times
This figure shows a circuit example when the EN pin is powered on at all times. To prevent a rush current from
occurring in the driver, it is necessary to apply voltages to the VIN pin and the LEDs prior to powering the current driver
ON. Mount an RC filter between the VIN and the EN pins to delay the EN pin rising against the power-supply voltage
rising. Determine the resistance value with which the LED current value is maximized and then connect such resistor
between the ISET and the GND pins.
(4)
Circuit example when performing a PWM brightness control
L1
L2
L3
L4
VIN
Cin
0.1μF
EN
UPIC
6
Current
DAC
ISET
GND
R ISET
120k ?
1M ?
PWM
Figure 19. Circuit example when performing a PWM brightness control
This figure shows a circuit example when performing a PWM brightness control. Through switching the ISET resistance
value by the PWM input signal, the LED current is outputted under a PWM mode. The EN signal is controlled by an
applied voltage level. In the circuit example shown above, the LED current value is changed to 3.43 mA in 0 % of the
PWM duty cycle, 17.72 mA in 50 % of that and 32 mA in 100 % of that.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
10/16
TSZ02201-0G3G0C200060-1-2
9.NOV.2012 Rev.001
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