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BD1754HFN 数据表(PDF) 8 Page - Rohm |
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BD1754HFN 数据表(HTML) 8 Page - Rohm |
8 / 12 page 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. |
类似零件编号 - BD1754HFN |
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类似说明 - BD1754HFN |
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