om5448 Hendon Semiconductors, om5448 Datasheet - Page 8

• Manufacturer Part Number: om5448
• Description: Low Voltage Led Driver And Boost Converter
• Manufacturer: Hendon Semiconductors

2007 May 28, Revision 1.0
E ffi c i e n c y (% )
Ef f i c i e n c y ( %)
Fig.5 OM5448 efficiency when driving a white LED (V
100
100
90
80
70
60
50
40
30
20
1 0
90
80
70
60
50
40
30
20
10
0
0
0
5
Fig.6 OM5448 efficiency when driving a white LED in DC mode. See figure 4.
5
1 0
LE D Current vs E ffic ienc y for O M5 4 48 wit h Whit e LE D, 10 uF ca p and diode
100uH ( 10uCap, Diode, 2V4)
LE D Curre nt vs E ffic ie nc y for OM54 4 8 wit h Whit e LE D, No c ap or diode
10
1 00uH (No Cap, No Diode, 2V4)
1 00uH (No Cap, No Diode, 1V2)
15
For 1.2 volt and 2.4 volt supply.
For 1.2 volt and 2.4 volt supply.
15
220uH ( 10uCap, Diode, 2V4)
20
L E D C u r re n t (mA )
LED C u r r e n t ( m A )
20
8
F
= 3.1 V at 20 mA) in pulse mode. See figure 3.
220uH (No Cap, No Diode, 2V4)
220uH (No Cap, No Diode, 1 V2)
25
25
100uH ( 10uCap, Diode, 1V2)
30
Low Voltage LED Driver
30
and Boost Converter
35
220uH (10uCap, Diode, 1V2)
35
Product Specification
OM5448
40
40
45