Hello guys,
I would like to turn on an LED that can use 1 A and 4 V and the Arduino using the same power source which is an adapter 12 V and 2 A. I have the driver for the LED, so that part is ok. I just want to know if I can make a voltage divider and use the same power source for both LED and Arduino Uno circuit.
Thanks
No. Voltage dividers can't be used that way.
Can you post a data sheet for the LED driver
I don't think so voltage divider would work in that way.
But if you share data sheet of your driver it may be helpful to solve
Assuming it's a constant-current LED driver, it requires "extra voltage". The current is controlled and the voltage across the LED "falls into place".
It works the opposite of a regular power supply where the voltage is constant/controlled and the current depends on the load resistance.
When no load is connected to a constant-current power supply the voltage maxes-out as it tries to push current through an infinite load.
Thanks all.
Here is the links for the LED and driver:
The datasheets are here
RCD-24-0.70_PL_A_eng_tds.pdf (121.7 KB)
LZ1-00UBN0_EN.pdf (816.3 KB)
You can connect the driver and the arduino directly too the 12V 2A supply, no need for any other voltage reducing components
The PWM section of that driver datasheet shows that your input signal spec is:
0V for on,
3-5V for off,
1 mA current max,
and should be around 200 Hz update frequency.
All of which is quite doable with Arduino digital outputs.
Do take note that the signal is 'inverted', that is the wider the PWM 'ON' pulse, the less light will be emitted.
PWM Dimming and ON/OFF Control (Leave open if not used)
Remote ON/OFF DC/DC ON Open or 0V<Vr<0.6V
Threshold Voltages DC/DC OFF (Standby) 0.6<Vr<2.9V
DC/DC OFF (Full Shutdown) 2.9V<Vr<6V
Remote Pin Drive Current Vr=5V 1mA max
Quiescent Input Current in Shutdown Mode Vin=36V 200μA max
Recommended PWM Frequency For Linear Operation 200Hz
(measured 10%~90% Dimming) Maximum Frequency 1000Hz
Thanks, but the max forward voltage for the LED is just 4.2 V, and assuming that I connect the 12 V to the driver and the driver output is more than 4.2, I am worried that it might burn the LED.
No. Do you understand the difference between a Current Regulated supply and a Voltage Regulated supply?
Yes I do understand the difference between them and the one I have is just a current regulator one. I just want to know if there is a way that i can turn on this LED with the driver that I have. Max input for LED is 4.2 V and min input for the driver is 6 V.
The driver output is a current, not a voltage. It is your responsibility to see that the driver output current does not exceed the LED current rating.
The current output of your driver must match the LED needs fairly closely(it does). Beyond that, as long as the driver has enough voltage (it does), what you will get is exactly what you need. Feed it 6V or 10V, it doesn't matter, because all that matters is the LED gets the current specified. It's a current regulator, remember, and the LED is a current-driven device.
Great thanks. I have always thought that the input and output voltage for a current regulator driver is same or very near each other. Now i know what you mean. Thanks again for enlightening me.
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