Notes on Use of Auto-Track™

U2

PTH04T260W

Vi

Auto Track

GND

VoAdj

Vo

TurboTrans

+Sense

−Sense

Inhibit/

UVLO

U3

TPS3808G50

6

GND

2

4

3

MR

CT

SENSE

5

1

U1

PTH05T210W

Vi

Auto Track

GND

VoAdj

Vo

TurboTrans

+Sense

−Sense

+

Inhibit/

UVLO

SmartSync

+

4.75 k

Ω

1.62 k

Ω

RESET

0.1

µF

4700

µF

UDG−06042

PTH04T260W, PTH04T261W

1. The Track pin voltage must be allowed to rise above the module set-point voltage before the module

regulates at its adjusted set-point voltage.

2. The Auto-Track function tracks almost any voltage ramp during power up, and is compatible with ramp

speeds of up to 1 V/ms.

4. The module cannot follow a voltage at its track control input until it has completed its soft-start initialization.

This takes about 20 ms from the time that a valid voltage has been applied to its input. During this period, it

is recommended that the Track pin be held at ground potential.

disabled, the output voltage rises at a quicker and more linear rate after input power has been applied.

Figure 24. Sequenced Power Up and Power Down Using Auto-Track

Copyright © 2006–2009, Texas Instruments Incorporated

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