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PTH04T220WAZ Datasheet(PDF) 29 Page - Texas Instruments

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No. de pieza PTH04T220WAZ
Descripción Electrónicos  16-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS
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PTH04T220WAZ Datasheet(HTML) 29 Page - Texas Instruments

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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
4.75 k
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
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