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BD1754HFN-TR Datasheet(PDF) 10 Page - Rohm

Part No. BD1754HFN-TR
Description  Constant Current LED Driver with 64 Dimming Steps for up to 4 LEDs
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BD1754HFN-TR Datasheet(HTML) 10 Page - Rohm

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BD1754HFN
Datasheet
TSZ02201-0G3G0C200060-1-2
9.NOV.2012 Rev.001
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
(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)
120k
Cin
RISET
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
VIN
ISET
GND
Current
DAC
UPIC
6
EN
L2
L1
0.1µF
PWM
1M
120k
L4
L3
Cin
RISET
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.


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