Datasheet

DC-DC C onstant Cur rent St ep-Down LED driver
LD D-H
s er i es
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
1 2 3 4 5 6 7 8 9 10 11 12 13 14
300mA
350mA
500mA
600mA
700mA
1000mA
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
1 2 3 4 5 6 7 8 9 10
300mA
350mA
500mA
600mA
700mA
1000mA
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
1 2 3 4 5 6 7
300mA
350mA
500mA
600mA
700mA
1000mA
80.0%
85.0%
90.0%
95.0%
100.0%
1 2 3
300 mA
350 mA
500 mA
600 mA
700 mA
1000mA
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)
80%
85%
90%
95%
100%
1 2 3
80%
2 3 4 5 6 7
75%
1
80%
85%
90%
95%
100%
3 4 5 6 7 8 9 10
75%
70%
1 2
70%
65%
75%
4 5 6 7 8 9 10 11 12 13 141 32
300mA
350mA
500mA
600mA
700mA
1 000mA
300mA
300mA
3 00mA
350mA
350mA
3 50mA
500mA
500mA
5 00mA
600mA
600mA
6 00mA
700mA
700mA
7 00mA
1 000mA
1 000mA
1000mA
Fig-4 4 8VDC input, 1~14 LEDs(Vf=3V)
Output Voltage(LEDs)
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 25 50 75 100
Duty Cycle (%)
25
50
75
100
◎ During PWM dimming operation, the output current will change to
PWM style.
Tol : 3%(Typ.)±
Derating Curve
Ta ( )℃
-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.
(>22 0 )℃
220℃
Time(sec.)
Remark : The c urve applies only to the " Hot Air Reflow Solderin g"
0
50
100
150
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