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| en:electronics:led_resistor [2010/02/08 12:54] – mikk.leini | en:electronics:led_resistor [2020/07/20 09:00] (current) – external edit 127.0.0.1 | ||
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| - | ====== LED resistor calculation | + | ====== LED Resistor Calculation |
| - | Kui LED-i (valgusdioodi) on vaja toita kõrgema pingega, kui on selle päripinge, ja väiksema vooluga, kui toiteallikas välja annab, tuleb LED-iga järjestikku lisada takisti. Takisti piirab nii voolu kui tekitab vajaliku pingelangu. Õige takisti leidmiseks on Ohmi seadusest tuletatud lihtne valem: | + | If the supply voltage is higher than the LED's voltage, the resistor has to be included in the circuit in series. The resistor limits the current and produces the required voltage drop. To find the correct value for the resistor, the following equation is derived from Ohm's law: |
| - | [{{ : | + | [{{ : |
| R = (U< | R = (U< | ||
| Line 9: | Line 9: | ||
| P< | P< | ||
| - | kus: | + | where: |
| - | * R on takisti takistus. | + | * R is resistance. |
| - | * U< | + | * U< |
| - | * U< | + | * U< |
| - | * I< | + | * I< |
| - | * U< | + | * U< |
| - | * P< | + | * P< |
| - | LED-i voolu piirav takisti peab olema vähemalt sama suure takistusega kui R ja vähemalt sama suure võimsusega kui P< | + | The current limiting resistor of an LED has to be not smaller than R, and at least with the power of P< |
