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TPS54386PWPR Datasheet(PDF) 19 Page - Texas Instruments

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Part # TPS54386PWPR
Description  3-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET
PDF  52 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS54386PWPR Datasheet(HTML) 19 Page - Texas Instruments

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100
1 M
1 k
100 k
10 k
-90
0
45
135
180
-45
90
270
225
Duty Cycle %
Gain
Phase
10
30
50
70
90
f - Frequency -Hz
-20
20
40
80
100
0
60
100
1M
1k
100k
10k
f
Frequency
Hz
-
-
-20
10
55
85
100
-5
70
25
-90
0
45
135
180
-45
90
270
225
GainPhase
10
30
50
70
90
40
DutyCycle%
100
1 M
1 k
100 k
10 k
-90
0
45
135
180
-45
90
270
225
f - Frequency -Hz
-20
20
40
80
100
0
60
Duty Cycle %
Gain
Phase
10
30
50
70
90
100
1M
1k
100k
10k
-90
0
45
135
180
-45
90
270
225
f
Frequency
Hz
-
-
GainPhase
10
30
50
70
90
-20
10
55
85
100
-5
70
25
40
DutyCycle%
Maximum Output Capacitance
TPS54383,, TPS54386
SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007
GAIN AND PHASE
GAIN AND PHASE
vs
vs
FREQUENCY
FREQUENCY
Figure 26. TPS54383 at 600-mApp Ripple Current
Figure 27. TPS54386 at 200-mApp Ripple Current
GAIN AND PHASE
GAIN AND PHASE
vs
vs
FREQUENCY
FREQUENCY
Figure 28. TPS54386 at 400-mApp Ripple Current
Figure 29. TPS54386 at 600-mApp Ripple Current
With internal pulse-by-pulse current limiting and a fixed soft start time, there is a maximum output capacitance
which may be used before startup problems begin to occur. If the output capacitance is large enough so that the
device enters a current limit protection mode during startup, then there is a possibility that the output will never
reach regulation. Instead, the TPS5438x simply shuts down and attempts a restart as if the output were
short-circuited to ground. The maximum output capacitance (including bypass capacitance distributed at the
load) is given by Equation 3:
Copyright © 2007, Texas Instruments Incorporated
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Product Folder Link(s): TPS54383 TPS54386



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