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BD1754HFN Arkusz danych(PDF) 11 Page - Rohm |
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BD1754HFN Arkusz danych(HTML) 11 Page - Rohm |
11 / 19 page 11/16 BD1754HFN Datasheet TSZ02201-0G3G0C200060-1-2 9.NOV.2012 Rev.001 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 (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) 120k Ω ILED=128mA Cin RISET 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 Ω 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 k Ω 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) 120k Ω ILED=32mA VIN ISET GND Current DAC UPIC 6 EN L2 L1 L4 L3 (When ILED-max =32mA) 120k Ω ILED=32mA 0.1µF Cin RISET Cin RISET 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. |
Podobny numer części - BD1754HFN_12 |
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Podobny opis - BD1754HFN_12 |
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