Texas Instruments TPS61181(82/81A)-259 Evaluation Board TPS61181(82/81A)EVM-259 TPS61181AEVM-259 TPS61181AEVM-259 Manuale Utente
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TPS61181AEVM-259
DCTRL
VO AC
IL
1 A/div
t - Time - 500
s/div
m
V = 11 V,
I = 20 mAx6 = 120 mA,
PWM Freq = 500 Hz,
Duty = 50%
I = 20 mAx6 = 120 mA,
PWM Freq = 500 Hz,
Duty = 50%
IN
O
100 mVac/div
5 V/div
Input/Output Connector Descriptions
Figure 5. Output Ripple at PWM Dimming with C
O
= 4.7
μ
F
Note that when measuring the WLED output voltage for the efficiency computation, the output voltage
from the IC's I
from the IC's I
OUT
pin to ground was used, which includes the voltage drop across the series ammeter,
used to measure the WLED current, as well as the voltage drop across the internal current sink circuit and
external current setting resistor.
external current setting resistor.
6
TPS61181EVM-259 / TPS61182EVM-259
SLVU223B
–
February 2008
–
Revised May 2011
Copyright
©
2008
–
2011, Texas Instruments Incorporated