ame5142 AME, Inc., ame5142 Datasheet - Page 11

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

using a DC voltage circuit is shown in Figure 6. According to the Superposition Theorem, as the DC voltage increases,
the voltage contributed to V
example, if the V
20mA to 0mA.
Rev. A.04
AME5142
n Application Hints
Dimming Control
B. Using a DC Voltage
Using a variable DC voltage to adjust the brightness is a popular method in some applications. The dimming control
150
125
100
75
50
25
0
0
AME, Inc.
DC
0.2
range is from 0V to 3V, the selection of resistors in Figure 6 sets dimming control of LED current from
V
FB
0.4
VDC(V)
VS VDC
FB
increases and the voltage drop on R2 decreases, i.e. the LED current decreases. For
0.6
4.7 F
V
C
IN
IN
2.7V to 5.5V
Figure 6. Dimming Control Using a DC Voltage
0.8
IN
EN
GND
1
AME5142
10 H
L1
OVP
VDC Dimming
SW
FB
20
15
10
0V to 3V
5
0
0
White LED Boost Converter
91K
R4
5.1K
R3
0.2
7.5
R2
I
OUT
V
0.4
OUT
VDC(V)
VS VDC
C
1 F
OUT
In Tiny Package
0.6
0.8
1
11