TPS61193

FB

PWM

OUT1

L1

D1

4.5...30 V

Up to 100 mA/string

SW

LDO

FSET

VIN

VDDIO/EN

PGND

GND

PAD

VIN

ISET

FAULT

VDDIO

FAULT

EN

R1

R2

R3

BRIGHTNESS

BOOST SYNC

SYNC

C1

Up to 8.5 V

OUT3

OUT2

L2

20ms/div

OUT1/OUT2/BOOST 10V/div

FAULT 2V/div

TPS61193

www.ti.com

SNVSAF4 – OCTOBER 2015

Figure 21. Typical Start-Up

Figure 22. Open LED Fault

8.2.2 SEPIC Mode Application

two separate coils are used for SEPIC. This can enable lower height external components to be used, compared

to a coupled coil solution. On the other hand, coupled coil typically maximizes the efficiency. Also, in this

example, an external clock is used to synchronize SEPIC switching frequency. External clock input can be

modulated to spread switching frequency spectrum.

Figure 23. SEPIC Mode, 3 Strings, 100 mA/String Configuration

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