Constant Current LED Driver (Rev. C) - Educypedia
Constant Current LED Driver (Rev. C) - Educypedia
Constant Current LED Driver (Rev. C) - Educypedia
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TPS61042<br />
SLVS441C–DECEMBER 2002–REVISED MARCH 2007<br />
V CC = 1.8 V to 6 V<br />
C (IN)<br />
4.7 F<br />
Analog Brightness Control<br />
3.3 V <strong>LED</strong> Off<br />
0 V I<strong>LED</strong> = 20 mA<br />
V CC = 1.8 V to 6 V<br />
3.3 V PWM Signal<br />
0 % <strong>LED</strong>s on<br />
100 % <strong>LED</strong>s Off<br />
C IN<br />
4.7 F<br />
R<br />
C<br />
R2<br />
120 k<br />
R2<br />
120 k<br />
L1<br />
4.7 H<br />
VIN<br />
CTRL<br />
GND<br />
FB<br />
R1<br />
10 k<br />
SW<br />
OVP<br />
<strong>LED</strong><br />
R S<br />
L1<br />
4.7 H<br />
VIN<br />
CTRL<br />
GND<br />
FB<br />
R1<br />
10 k<br />
SW<br />
OVP<br />
<strong>LED</strong><br />
R S<br />
D1<br />
ZHCS400<br />
R S<br />
13 <br />
D1<br />
ZHCS400<br />
R S<br />
13 <br />
C O<br />
100 nF<br />
Figure 26. Adjustable Brightness Control Using an Analog Voltage<br />
C O<br />
100 nF<br />
Figure 27. Alternative Adjustable Brightness Control Using PWM Signal<br />
20 Submit Documentation Feedback<br />
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