Texas Instruments TPS92691, User Manual, Page: 8 / 25

Input Voltage, VIN (V)
Ef
ficie
ncy
(%)
5 10 15 20 25 30 35 40
70
80
90
100
D003
I
LED
= 100mA
I
LED
= 300mA
I
LED
= 500mA
Input Voltage, VIN (V)
Ef
ficie
ncy
(%)
5 10 15 20 25 30 35 40
70
80
90
100
D002
I
LED
= 100mA
I
LED
= 300mA
I
LED
= 500mA
Input Voltage (V)
Ef
ficie
ncy
(%)
5 10 15 20 25 30 35 40
70
80
90
100
D001
I
LED
= 100mA
I
LED
= 300mA
I
LED
= 500mA
I
LED
= 1.5A
Performance Data and Typical Characteristic Curves
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6 Performance Data and Typical Characteristic Curves
The following performance curves are presented for the EVM configured with a high-side current sense
resistor and a series PFET device (
Figure 2 ). The EVM circuit can be modified to implement low-side
current sense and series NFET dimming ( Figure 3 ), with minor differences in performance.
6.1 Efficiency
Figure 4. Efficiency vs Input Voltage (Number of series connected LEDs = 3)
Figure 5. Efficiency vs. Input Voltage (Number of series connected LEDs = 7)
Figure 6. Efficiency vs. Input Voltage (Number of Series-Connected LEDs = 13)
8 TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015
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