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TPS75915KTTR Datasheet(PDF) 21 Page - Texas Instruments

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No. de Pieza. TPS75915KTTR
Descripción  POWER GOOD FAST-TRANSIENT RESPONSE 7.5-A LOW-DROPOUT VOLTAGE REGULATORS
Descarga  30 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS75915KTTR Datasheet(HTML) 21 Page - Texas Instruments

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OUTPUT CAPACITOR
100
47
10
0.01
1000
0.1
ESR − Equivalent Series Resistance −
Y = ESRmin x Co
Region of Stability
Region of Instability
ESR min x Co = Constant
0.2
TPS75901, TPS75915
TPS75918, TPS75925, TPS75933
SLVS318E – DECEMBER 2000 – REVISED MARCH 2004
APPLICATION INFORMATION (continued)
As with most LDO regulators, the TPS759xx requires an output capacitor connected between OUT and GND to
stabilize the internal control loop. The minimum recommended capacitance value is 47 µF with an ESR
(equivalent series resistance) of at least 200 m
Ω. As shown in Figure 29, most capacitor and ESR combinations
with a product of 47e-6 x 0.2 = 9.4e-6 or larger will be stable, provided the capacitor value is at least 47 µF. Solid
tantalum electrolytic and aluminum electrolytic capacitors are all suitable, provided they meet the requirements
described in this section. Larger capacitors provide a wider range of stability and better load transient response.
This information along with the ESR graphs, Figure 19, Figure 20, and Figure 29, is included to assist in
selection of suitable capacitance for the user's application. When necessary to achieve low height requirements
along with high output current and/or high load capacitance, several higher ESR capacitors can be used in
parallel to meet these guidelines.
Figure 29. Output Capacitance vs Equivalent Series Resistance
21


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