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SLTS062B Datasheet(PDF) 6 Page - Texas Instruments

Part # SLTS062B
Description  The PT6930 Excalibur series of 8-A dual-output ISRs are designed to power
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SLTS062B Datasheet(HTML) 6 Page - Texas Instruments

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For technical support and more information, see inside back cover or visit www.ti.com
Application Notes continued
Table 1: Input/Output Capacitors
(a) -Not recommended. The maximum ripple current rating of these capacitors does not meet the operating limits.
(N/R) -Oscon Type Capcitors are not recommended for this application due to extremely low equivatlent series resistance (ESR)
Capacitor Recommendations for
the Dual-Output
PT6920/30 Regulator Series
Input Capacitors:
The recommended input capacitance is determined by 1.0
ampere minimum ripple current rating and 330µF minimum
capacitance (300µF for Oscon® or low ESR tantalum).
Ripple current and <100m
Ω equivalent series resistance
(ESR) values are the major considerations, along with tem-
perature, when designing with different types of capacitors.
Tantalum capacitors have a recommended minimum voltage
rating of 2
× the maximum DC voltage + AC ripple. This is
necessary to insure reliability for input voltage bus applica-
tions.
Output Capacitors: C
2
(Required), C
3
(Optional)
The ESR of the required capacitor (C2) must not be greater
than 150m
Ω. Electrolytic capacitors have poor ripple per-
formance at frequencies greater than 400kHz but excellent
low frequency transient response. Above the ripple fre-
quency, ceramic capacitors are necessary to improve the
transient response and reduce any high frequency noise
components apparent during higher current excursions.
Preferred low ESR type capacitor part numbers are identified
in Table 1. The optional 100µF capacitor (C3) for Vo2 can
have an ESR of up to 200m
Ω for optimum performance
and ripple reduction. (Note: Vendor part numbers for the
optional capacitor, C3, are not identified in the table. Use the
same series selected for C2)
PT6920/PT6930 Series
Tantalum Capacitors
Tantalum type capacitors can be used for the output but only
the AVX TPS series, Sprague 593D/594/595 series or Kemet
T495/T510 series. The AVX TPS series, Kemet or Sprague
series tantalums are recommended over many other types
due to their higher rated surge, power dissipation, and ripple
current capability. As a caution the TAJ series by AVX is not
recommended. This series has considerably higher ESR,
reduced power dissipation and lower ripple current capability.
The TAJ Series is a less reliable when compared to the AVX
TPS series when determining power dissipation capability.
Tantalum types are recommended for applications where
ambient temperatures fall below 0°C.
Capacitor Table
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The number of capacitors required at both the
input and output buses is identified for each capacitor type.
This is not an extensive capacitor list. Capacitors from other
vendors are available with comparable specifications. Those listed
are for guidance. The RMS ripple current rating and ESR
(Equivalent Series Resistance at 100kHz) are critical parameters
necessary to insure both optimum regulator performance and
long capacitor life.
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