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BD1754HFN Fiches technique(PDF) 9 Page - Rohm |
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BD1754HFN Fiches technique(HTML) 9 Page - Rohm |
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9 / 21 page  9/17 BD1754HFN Datasheet TSZ02201-0G3G0C200060-1-2 10.Dec.2015 Rev.002 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 2. Application Circuit Examples (1) Circuit example when the power supply is separated IN ISET GND Current DAC UPIC 6 EN L4 L3 L2 L1 On the assumption that VF is 3 V Power Supply2=5V 0.1µF 120k Ω The voltage value of L* pin must be VIN-1.4 V at the maximum when the LED is powered ON. Power Supply1 (When ILED-max=32mA) (Maximum rating = 7.0 V) CIN RISET (Ex.) Figure 13. Circuit Example when the Power Supply is separated This figure shows a circuit example when the power supply for IN and for LEDs is separated. Apply a voltage of VF (threshold voltage value of a white LED) or higher to the LED. In this case, please note that when the LED is powered ON, the voltage value of L* pin (each pin of L1 to L4) must be VIN-1.4 V at the maximum. If a voltage of higher than VIN-1.4 V is applied to L* pin, a desired current value cannot be obtained. Also, please pay attention to the voltage application procedure at start-up. Be sure to power the current driver ON using the UPIC after applying power supply voltages to the IN and the LED-anode pins. If the current driver is powered ON prior to applying power supply voltages to the LED, a rush current occurs in the LED. 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. (2) Circuit example when using only two LEDs 120k Ω IN ISET GND Current DAC UPIC 6 EN L2 L1 0.1µF Connect to the GND pin. (When ILED-max=32mA) CIN RISET L4 L3 Figure 14. Circuit Example when using only Two LED’s This figure shows a circuit example when none of L3 and L4 LED’s are used. Connect both of the unused L3 and L4 pins to the GND pin. Likewise, it is possible to make the L1 and/or the L2 pins unused, which allows the back lights to be used with the one or three LED(s) turned ON. In all cases, connect the unused L* pin to the GND pin. 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 LED’s are controlled through the EN pin in accordance with the UPIC format. |
Numéro de pièce similaire - BD1754HFN_15 |
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Description similaire - BD1754HFN_15 |
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