ame5142 AME, Inc., ame5142 Datasheet - Page 12

• Manufacturer Part Number: ame5142
• Description: White Led Boost Converter In Tiny Package
• Manufacturer: AME, Inc.

n Application Hints
12
AME5142
voltage source in dimming control. The circuit is shown in Figure 7.
C. Using a Filtered PWM Signal
The filtered PWM signal can be considered as an adjustable DC voltage. It can be used to replace the variable DC
150
125
100
75
50
25
0
0
AME, Inc.
0.2
V
FB
VS Duty Cycle
Duty Cycle
0.4
4.7 F
V
C
Figure 7. Dimming Control Using a Filtered PWM Signal
0.6
IN
IN
2.7V to 5.5V
0.8
IN
EN
GND
1
AME5142
10 H
L1
3V
0V
OVP
SW
FB
PWM Signal
20KHZ
10K
20
15
10
91K
R
R4
5
0
5.1K
DC
White LED Boost Converter
R3
0
1 F
C
DC
0.2
I
7.5
OUT
R2
VS Duty Cycle
Duty Cycle
0.4
V
OUT
C
1 F
OUT
In Tiny Package
0.6
0.8
Rev. A.04
1