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Functions and Characteristics

According to four parameters above and the V-I curve of LED, you can

calculate the value of R and Vd.





 

RIVV 

0od

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*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

: 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.

ITech IT8511A+ User Manual

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