TPS61193-Q1 datasheet(12/35 Pages) TI1

Part #	TPS61193-Q1

Description	High-Performance 3-Channel LED Driver

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Manufacturer	TI1 [Texas Instruments]

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R1 (k )

C008

VOUT_MAX = (

VBG

R2

+ 0.0387 ) x R1 + VBG

TPS61193-Q1

SNVSAC7 – OCTOBER 2015

www.ti.com

7.3 Feature Description

7.3.1 Integrated DC-DC Converter

The TPS61193-Q1 DC-DC converter generates supply voltage for the LEDs and can operate in boost mode or in

SEPIC mode. The maximum output voltage VOUT_MAX is defined by an external resistive divider (R1, R2).

VOUT_MAX voltage should be chosen based on the maximum voltage required for LED strings. Recommended

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

VOUT_MAX voltage. DC-DC output voltage is adjusted automatically based on LED current sink headroom voltage.

Maximum output voltage can be calculated with Equation 1:

where

•

VBG = 1.2 V

•

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

the feedback. Switching frequency is adjustable between 250 kHz and 2.2 MHz with RFSET resistor as

Equation 2:

ƒSW = 67600 / (RFSET + 6.4)

where

•

ƒSW is switching frequency, kHz

•

RFSET is frequency setting resistor, kΩ

(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

pF capacitor CFB must be placed across resistor R1 when operating in 300 kHz to 500 kHz range (see Typical

Application for 3 LED Strings). When operating in the 1.8 MHz to 2.2 MHz range CFB = 4.7 pF.

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TPS61193-Q1 Datasheet(PDF) 12 Page - Texas Instruments

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