ame5142c AME, Inc., ame5142c Datasheet - Page 13

• Manufacturer Part Number: ame5142c
• Description: High Efficiency 6 White Led Driver With Open Led Protection
• 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
from 20mA to 0mA.
Rev. B.01
AME5142C
Dimming Control
A. 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
0.56
DC
range is from 0V to 2.8V, the selection of resistors in Figure 6 sets dimming control of LED current
V
1.12
FB
VDC(V)
VS VDC
FB
increases and the voltage drop on R2 decreases, i.e. the LED current decreases. For
1.68
1 F
V
C
IN
IN
2.8V to 5.5V
Figure 6. Dimming Control Using a DC Voltage
2.24
2.80
IN
EN
GND
AME5142C
22 H
High Efficiency 6 White LED Driver
L1
20
15
10
OVP
5
0
SW
VDC Dimming
0
FB
0V to 2.8V
With Open LED Protection
91K
0.56
R4
5.1K
R3
I
OUT
1.12
5.1
R2
VDC(V)
VS VDC
V
OUT
1.68
0.22 F
C
OUT
2.24
2.80
13