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PT7711A Datasheet(PDF) 4 Page - Texas Instruments

Part # PT7711A
Description  20-A Programmable Integrated Switching Regulator
Download  9 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PT7711A Datasheet(HTML) 4 Page - Texas Instruments

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Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT7710 Family, PT7744/PT7745
Capacitor Recommendations for
the PT7710
Series of Regulators and Current Boosters
Input Capacitors
The recommended input capacitance is determined by the
1.4 ampere minimum ripple current rating and 1500µF
minimum capacitance. Capacitors listed below must be
rated for a minimum of twice (2
×) the input voltage with
+5V operation. Ripple current and
≤100mΩ Equivalent
Series Resistance (ESR) values are the major consider-
ations along with temperature when selecting the proper
capacitor.
Output Capacitors
The minimum required output capacitance is 330µF with
a maximum ESR less than or equal to 100m
Ω. Failure to
observe this requirement may lead to regulator instability or
oscillation. Electrolytic capacitors have poor ripple perfor-
mance at frequencies greater than 400kHz, but excellent low
frequency transient response. Above the ripple frequency
ceramic decoupling capacitors are necessary to improve the
transient response and reduce any microprocessor high
frequency noise components apparent during higher current
excursions. Preferred low ESR type capacitor part numbers
are identified in the Table 1-1 below.
Note: (N/R) is not recommended for this application, due to extremely low Equivalent Series Resistance (ESR)
Table 1-1 Capacitors Characteristic Data
Tantalum Characteristics
Tantalum capacitors with a minimum 10-V rating are
recommended on the output bus, but only the AVX TPS
Series, Sprague 594/595 Series, or Kemet T495/T510
Series. These AVX, Sprague, and Kemet capacitors are
specified over other types due to their higher surge cur-
rent, excellent power dissipation and ripple current ratings.
As a caution, the TAJ Series by AVX is not recommended.
This series exhibits considerably higher ESR, reduced power
dissipation and lower ripple current capability. The TAJ
series is also less reliable compared to the TPS series when
determining power dissipation capability.
Capacitor Table
Table 1-1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The suggested minimum quantities per
regulator for both the input and output buses are identified.
This is not an extensive capacitor list. Capacitors from
other vendors are available with comparible specifications.
The RMS ripple current rating and ESR (Equivalent Series
Resistance at 100kHz) are the critical parameters necessary
to insure both optimum regulator performance and long
capacitor life.
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