Datasheet

DC-DC Constant Current Step-Down LED driver
LDD-H series
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
1234 567891011121314
300 mA
350 mA
500 mA
600 mA
700 mA
1000 mA
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
12345678910
300 mA
350 mA
500 mA
600 mA
700 mA
1000 mA
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
1234567
300 mA
350 mA
500 mA
600 mA
700 mA
1000 mA
80.0%
85.0%
90.0%
95.0%
100.0%
123
300 mA
350 mA
500 mA
600 mA
700 mA
1000 mA
Efficiency VS Output Voltage(Number of LEDs)
Fig-1 12VDC input, 1~3 LEDs(Vf=3V) Fig-2 24VDC input, 1~7 LEDs(Vf=3V)
Fig-3 36VDC input, 1~10 LEDs(Vf=3V)
Output Voltage(LEDs)
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
80%
85%
90%
95%
100%
123
80%
234567
75%
1
80%
85%
90%
95%
100%
34 5 6 78 9 10
75%
70%
12
70%
65%
75%
4 5 6 7 8 9 10 11 12 13 14132
300mA
350mA
500mA
600mA
700mA
1000mA
300mA
300mA
300mA
350mA
350mA
350mA
500mA
500mA
500mA
600mA
600mA
600mA
700mA
700mA
700mA
1000mA
1000mA
1000mA
Fig-4 48VDC input, 1~14 LEDs(Vf=3V)
Output Voltage(LEDs)
EFFICIENCY (%)
85%
90%
95%
100%
80%
85%
90%
95%
100%
Standard Application
+Vin +Vout
-Vin
H: >2.5~6VDC or open circuit
L: <0.8VDC or short
-Vout
1st LED
Last LED
H
PWM
Dimming
LDD-H
L
0 255075100
Duty Cycle (%)
25
50
75
100
◎ During PWM dimming operation, the output current will change to
PWM style.
Iout(%)
Tol : 3%(Typ.)±
Derating Curve
Ta ( )℃
LOAD (%)
-40 0 25 50
71
85
50
25
75
100
100
71 for 600~1000mA℃
85 for℃
300~500mA
Peak. Temp 240℃
10 sec. Max.
60 sec. Max.
(>220 )℃
220℃
Time(sec.)
Remark : The curve applies only to the " Hot Air Reflow Soldering"
0
50
100
150
Temperature ( )℃
220
240
Reflow Soldering Curve (for LDD-HS)
PWM Dimming Control
PWM
Signal
Output
Current
H(5V)
Max
L(0V)
0
OFF OFF OFF
ON ON
100~1KHz
ON
File Name:LDD-H-SPEC 2015-08-24
Output Voltage(LEDs) Output Voltage(LEDs)