Functions and Characteristics
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According to four parameters above and the V-I curve of LED, you can
calculate the value of R and Vd.
NOTE
The value of V2, V1, I2 and I1 should be close to the static working point of LED as
shown in the red circle above.
Or you can roughly calculate the value of R and Vd with the following equation.
V
d
=V*0.8 R=0.2V/I
Where:
V: constant working voltage of load LED of LED constant current source;
I: output current of LED constant current source;
V
d
: break-over voltage of diode (string);
R: constant resistance.
In the following example, the output voltage of LED driver is 50V, verify that
whether the output current of LED is rated current 200mA: Vd=50V*0.8=40V
R=(0.2*50V)/0.2A=50Ω.
Setting CR-LED Mode
Example: LED driver specification
The output current is 200mA and the range of output voltage is from 45V to
62V.
Operating steps:
1. Start CR-LED function and set the Vd value.
1) Press [Shift] + [CR] keys to enter configuration menu.
2) Press Right Key and select ON. Press [Enter] key to set the Vd value.
(Set Vd=40V).
Select OFF to disenable CR-LED function, and then press [Enter] to
exit the setting menu.
3) Press the [Enter] key to save the settings.
2. Set CR mode
1) Press [CR] key and set corresponding constant resistance. (Set
CR=50Ω)
2) Press the [Enter] key to save the settings.
3. Press [On/Off] key to turn on load input.
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