Function
and Features
Copyright ©ITECH Electronic Co., Ltd.
30
Led Mode
▲
Curr=3.000A
▼
8.
Set coeff of LED driver,press
to confirm
Led Mode
▲
Coef=0.150
▼
9.
Set PWM frequency,press
to confirm
Led Mode
▲
Freq= 100Hz
▼
10.
Set PWM duty ratio,press
to confirm
Led Mode
▲
Duty=0.500
▼
11.
Finish all settings.
0.000V 0.00000A
0.00W V
o
=200.00V
NOTE
Press upper key can help user return to last step operation.
After setting, you can press (Shift) +4 (Save) to save, so that you can press (Shift) + Enter
(Recall) to call.
Set LED mode value
⚫
Vo
：
constant working voltage For LED
constant source loaded with LED lamp;
⚫
I
o
：
output current of LED constant current
source;
⚫
V
f
：
break-over voltage of diode (string);
⚫
R
d
：
LED impedance value;
Get the equation below through the above four parameters and V-I
characteristic curve of LED:
DC
R
R
I
V
R
V
V
R
I
V
V
V
R
I
V
V
I
R
V
V
d
o
o
d
o
f
d
o
o
f
o
d
o
f
o
o
d
f
o
1
1
=
=
−
=
−
=
−
=
−
Define
DC
R
R
C
d
oeff
=
oeff
o
o
d
C
I
V
R
=
(
)
oeff
1
o
f
C
V
V
−
=
Coeff means the proportion of Rd voltage in the loop. This parameter is
convenient when the user analogs the same type of LED while the number of
series is different.
Note: The specification range of each parameter is as shown below:
CR-LED
mode
range
Uo-L
Uo-H
Option
Uo
Io
Coef
Rd
Uo
Io
Coef
Rd
range
0.1~100V
0~15A
0.01~1
0.08~30
Ω
0.1~500V
0~3A
0.01~1
1.8~1600
Ω
The relationship among Vo, Io, Rd and Coeff shall be subject to the equation:
oeff
o
o
d
C
I
V
R
=
. Actual set values of Vo, Io and Coeff are affected by their
