Owner's Manual

LDH-25 series
File Name:LDH-25-SPEC 2022-02-18
Standard Application
DC-DC Step-Up Constant Current LED driver
※ 2 in 1 dimming function
‧Output constant current level can be adjusted by applying one of the three methodologies between DIM+ and DIM-:
0 ~ 10VDC, or 10V PWM signal
‧Direct connecting to LEDs is suggested. It is not suitable to be used with additional drivers.
◎ Applying additive 0 ~ 10VDC
◎ Applying additive 10V PWM signal (frequency range 1KHz ~ 3KHz):
Vo+
Vo-
DIM+
DIM-
+
+
+
-
-
-
“DO NOT connect "DIM- to Vo-"
Additive Voltage
Vo+
Vo-
DIM+
DIM-
+
+
-
-
“DO NOT connect "DIM- to Vo-"
Additive PWM signal
Output current (%)
Dimming input: Additive voltage
Duty cycle of additive 10V PWM signal dimming input
0V 1V 2V 3V 4V 5V 6V 7V 8V 9V 10V
10%
0%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Note: 1.Min.dimming level is about 8% and the output current is not defined when 0%＜lout＜8%.
2.The output voltage is about equal to input voltage when dimming input is about 0Vdc,or 10V PWM signal with 0% duty cycle.
Output current (%)
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
10%
0%
20%
30%
40%
50%
60%
70%
80%
90%
100%