10

15

20

25

30

35

40

45

200

300

400

500

600

700

800

900

1000

R1 (k )

C008

R2

TPS61193

SNVSAF4 – OCTOBER 2015

www.ti.com

7.3 Feature Description

7.3.1 Integrated DC-DC Converter

The TPS61193 DC-DC converter generates supply voltage for the LEDs and can operate in boost mode or in

maximum voltage is about 30% higher than maximum LED string voltage. Initial output voltage is about 88% of

Maximum output voltage can be calculated with Equation 1:

where

•

•

R2 recommended value is 130 k

Ω

•

Resistor values are in k

Ω

(1)

Figure 7. Maximum Converter Output Voltage vs R1 Resistance

The converter is a current mode DC-DC converter, where the inductor current is measured and controlled with

Equation 2:

where

•

•

(2)

In most cases lower frequency has higher system efficiency. DC-DC internal parameters are chosen

automatically according to the selected switching frequency (see Table 2) to ensure stability. In boost mode a 15

12

Submit Documentation Feedback

Copyright © 2015, Texas Instruments Incorporated