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PTH04T220WAZ Datasheet(PDF) 29 Page - Texas Instruments |
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PTH04T220WAZ Datasheet(HTML) 29 Page - Texas Instruments |
29 / 39 page www.ti.com Notes on Use of Auto-Track™ V I = 5 V Vo 1 = 3.3 V R SET1 + Vo 2 = 1.8 V U1 U2 + PTH04T220W V I V O +Sense GND V O Adj PTH04T230W V I V O +Sense −Sense GND AutoTrack V O Adj R SET2 TurboTrans TurboTrans AutoTrack C4 V CC GND SENSE MR CT RESET 6 5 3 4 1 2 TPS3808G50 C3 4700 pF 0.1 µF −Sense 1.21 k Ω 4.75 k Ω CO1 CO2 CI1 CI2 U3 RTT RTT PTH04T220W, PTH04T221W SLTS275A – DECEMBER 2006 – REVISED FEBRUARY 2007 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. 3. The absolute maximum voltage that may be applied to the Track pin is the input voltage VI. 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. 5. The Auto-Track function is disabled by connecting the Track pin to the input voltage (VI). When Auto-Track is disabled, the output voltage rises according to its softstart rate after input power has been applied. 6. The Auto-Track pin should never be used to regulate the module's output voltage for long-term, steady-state operation. Figure 27. Sequenced Power Up and Power Down Using Auto-Track 29 Submit Documentation Feedback |
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