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# Do I need a resistor with COB LED?
## What is a COB LED?
COB (Chip on Board) LED is a type of LED package where multiple LED chips are mounted directly onto a PCB (Printed Circuit Board) or substrate. This design allows for a higher density of light output compared to traditional LEDs.
## Do COB LEDs require a resistor?
Yes, COB LEDs typically require a resistor to limit the current flowing through them. Without a resistor, the COB LED may draw too much current and become damaged. The resistor helps regulate the current to ensure the LED operates within its specified parameters.
## How to determine the resistor value for a COB LED?
To determine the correct resistor value for a COB LED, you will need to know the forward voltage (Vf) and forward current (If) ratings of the LED. You can usually find this information in the manufacturer's datasheet for the COB LED.
## Calculating the resistor value.
1. Determine the supply voltage: This is the voltage at which you will be operating the LED.
2. Subtract the forward voltage of the COB LED from the supply voltage to find the voltage drop across the resistor.
3. Use Ohm's Law (V = IR) to calculate the resistance needed to limit the current to the desired level. The formula is R = (Vsupply - Vf) / If.
## Example calculation.
Let's say you have a COB LED with a forward voltage of 3.5V and a forward current of 350mA. If you are using a 12V power supply, the calculation would be:
R = (12V - 3.5V) / 0.35A.
R = 24.3Ω.
## Conclusion.
In conclusion, it is recommended to use a resistor with a COB LED to protect the LED from excessive current and ensure it operates correctly. By calculating the correct resistor value based on the LED's specifications, you can effectively control the current flowing through the LED and prolong its lifespan.
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