YUANNENGJI 1. Forward operating current If:
It refers to the forward current value when the light-emitting diode emits light normally. In actual use, IF should be selected below 0.6IFm according to needs.
2. Forward operating voltage VF:
The operating voltage given in the parameter table is obtained under a given forward current. It is generally measured when IF=20mA. The forward operating voltage VF of the light-emitting diode is 1.4~3V. When the external temperature rises, VF will decrease.
3. V-I characteristics:
The relationship between the voltage and current of the light-emitting diode. When the forward voltage is less than a certain value (called the threshold), the current is extremely small and no light is emitted. When the voltage exceeds a certain value, the forward current increases rapidly with the voltage and emits light.
4. Luminous intensity IV:
The luminous intensity of the light-emitting diode usually refers to the luminous intensity in the direction of the normal line (for cylindrical light-emitting tubes, it refers to its axis). If the radiation intensity in this direction is (1/683) W/sr, the light is 1 candela (symbol: cd). Since the light-emitting diode intensity of a general LED is small, the luminous intensity is often measured in candela (mcd).
5. LED luminous angle:
-90- +90
6. Spectral half width:
It indicates the spectral purity of the light-emitting tube.
7. Half-value angle 1/2 and viewing angle:
The half-value angle 1/2 refers to the angle between the direction where the luminous intensity value is half of the axial intensity value and the luminous axis (normal direction).
8. Full form:
The angle calculated based on the LED luminous solid angle, also called the plane angle.
9. Viewing angle:
Refers to the maximum angle of LED luminescence. Depending on the viewing angle, the application is also different. It is also called the light intensity angle.
10. Half form:
The angle between the normal direction 0° and the maximum luminous intensity value/2. Strictly speaking, it is the angle corresponding to the maximum luminous intensity value and the maximum luminous intensity value/2. The packaging technology of LED causes the maximum luminous angle to be not the light intensity value of the normal direction 0°, and the deviation angle is introduced, which refers to the angle between the angle corresponding to the maximum luminous intensity and the normal direction 0°.
11. 最大順方向直流電流 IFm:
許容される最大順方向直流電流. この値を超えるとダイオードが損傷する可能性があります.
12. 最大逆電圧 VRm:
許容される最大逆電圧は降伏電圧です. この値を超えると発光ダイオードが降伏によって損傷する可能性があります.
13. 動作環境温度 topm:
発光ダイオードが正常に動作できる周囲温度範囲. この温度範囲を下回るか上回ると, 発光ダイオードは正常に動作せず、効率が大幅に低下します.
14. 許容消費電力 Pm:
LEDの両端にかかる順方向直流電圧とそれに流れる電流の積の最大値. この値を超えるとLEDが加熱し、損傷する可能性があります.