ZXLD1350
Typical operating conditions (continued)
100
95
90
85
80
75
70
5
Efficiency vs No. of LEDs
L=47uH, Rs=0.33 Ohms
1 LED
2 LED
3 LED
4 LED
5 LED
6 LED
7 LED
10
15
20
25
30
VIN (V)
Operating Frequency vs Input Voltage
L=47uH, Rs=0.33 Ohms
800
700
600
500
400
300
200
100
0
5
1 LED
2 LED
3 LED
4 LED
5 LED
6 LED
7 LED
10
15
20
25
30
VIN (V)
1
0.8
0.6
0.4
0.2
0
5
Duty Cycle vs Input Voltage
L=47uH, Rs=0.33 Ohms
1 LED
2 LED
3 LED
4 LED
5 LED
6 LED
7 LED
10
15
20
25
30
VIN (V)
Output Current Variation vs Supply Voltage
L=47uH, Rs=0.33 Ohms
20
15
10
5
0
-5 5
-10
1 LED
2 LED
3 LED
4 LED
5 LED
10
15
20
25
30 6 LED
7 LED
-15
VIN (V)
Issue 6 - April 2007
9
© Zetex Semiconductors plc 2007
www.zetex.com