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BD1754HFN Fiches technique(PDF) 7 Page - Rohm |
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BD1754HFN Fiches technique(HTML) 7 Page - Rohm |
7 / 12 page Technical Note 7/11 BD1754HFN www.rohm.com 2011.06 - Rev.B © 2011 ROHM Co., Ltd. All rights reserved. (3) Circuit example when the EN pin is powered on at all times Rs VIN ISET GND Current DAC UPIC 6 EN L2 L1 0.1µF Cs L4 L3 (When ILED-max=32mA) 120kΩ Cin RISET Fig.16 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 VIN ISET GND Current DAC UPIC 6 EN L2 L1 0.1µF PWM 1MΩ 120kΩ L4 L3 Cin RISET Fig.17 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. |
Numéro de pièce similaire - BD1754HFN |
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Description similaire - BD1754HFN |
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