TPS61042DRBR Datasheet, PDF (20/27 Pages) Texas Instruments – CONSTANT CURRENT LED DRIVER

TPS61042
SLVS441C – DECEMBER 2002 – REVISED MARCH 2007
V_CC = 1.8 V to 6 V
C_(IN)
4.7 mF
L1
4.7 mH
D1
ZHCS400
VIN
SW
CTRL _OVP
GND _LED
FB
R_S
C_O
100 nF
Analog Brightness Control
3.3 V b LED Off
0 V b ILED = 20 mA
R2
120 kW
R1
10 kW
R_S
13 W
Figure 26. Adjustable Brightness Control Using an Analog Voltage
L1
4.7 mH
D1
ZHCS400
V_CC = 1.8 V to 6 V
C_IN
4.7 mF
VIN SW
CTRL OVP
GND
FB
LED
R_S
C_O
100 nF
3.3 V PWM Signal
0 % LEDs on
100 % LEDs Off
R
C
R2
120 kW
R1
10 kW
R_S
13 W
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Figure 27. Alternative Adjustable Brightness Control Using PWM Signal
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