TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
www.ti.com
L1
10 µH
D1
D2
24 V
V
CC
= 2.7 V to 6 V
V
IN
SW
(Optional)
C1
4.7 µF
FB
L1:
D1:
C1:
C2:
Murata LQ
Motorola
Tayo Yud
Tayo Yud
C2
1 µF
R
82 Ω
EN
PWM
100 Hz to 500 Hz
GND
S
Figure 22. White LED Supply With Adjustable Brightness Control
Using a PWM Signal on the Enable Pin, Efficiency Approx. Equals 86% at VIN = 3 V, ILED = 15 mA
D1
L1
MBRM120L
10 µH
C2
100 nF
(See
D2
24 V
(Optional)
V
CC
= 2.7 V to 6 V
V
SW
FB
IN
Note A)
C1
4.7 µF
R1
120 kΩ
EN
GND
R
S
110 Ω
L1:
D1:
C1:
C2:
Murata LQH4C3R3M04
Motorola MBR0530
Tayo Yuden JMK212BY475MG
Standard Ceramic Capacitor
Analog Brightness Control
3.3 V Led Off
R2
160 kΩ
0 V Iled = 20 mA
A. A smaller output capacitor value for C2 causes a larger LED ripple.
Figure 23. White LED Supply With Adjustable Brightness Control
Using an Analog Signal on the Feedback Pin
16
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