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參數(shù)資料
| 型號(hào)： | PT7742810 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 20 Amp Current Booster for PT7708 Integrated Switching Regulator |
| 中文描述： | 20安培電流增壓的PT7708集成開關(guān)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 2/4頁(yè) |
| 文件大?。?/td> | 94K |
| 代理商： | PT7742810 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT7708/PT7709, PT7742/PT7743
Capacitor Recommendations for
the PT7708/09
Regulators and PT7742/43 Current Boosters
Input Capacitors
The recommended input capacitance is determined by
1.4 ampere minimum ripple current rating and 1500μF
minimum capacitance. Capacitors listed below must be
rated for a minimum of 2x the input voltage with +5V
operation. Ripple current and
≤
100m
Equivalent Series
Resistance (ESR) values are the major considerations 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
. Failure to
observe this requirement may lead to regulator instability
or oscillation. Electrolytic capacitors have poor ripple per-
formance at frequencies greater than 400kHz, but excellent
low frequency transient response. Above the ripple fre-
quency ceramic decoupling capacitors are necessary to
improve the transient response and reduce any microproces-
sor high frequency noise components apparent during
higher current excursions. Preferred low ESR type capaci-
tor part numbers are identified in the Table 1 below.
Note:
(N/R) is not recommended for this application, due to extremely low Equivalent Series Resistance (ESR)
Table 1 Capacitors Characteristic Data
Tantalum Characteristics
Tantalum capacitors with a minimum 10V rating are
recommended on the output bus, but only the AVX TPS
Series, Sprague 594/595 Series, or Kemet T495/T510 Series.
The AVX TPS Series, Sprague Series or Kemet Series
capacitors are specified over other types due to their
higher surge current, excellent power dissipation and ripple
current ratings. As an example, 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 a less reliable compared to
the TPS series when determining power dissipation capability.
Capacitor Table
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The suggested minimum quantities per regu-
lator for both the input and output buses are identified.
This is not an extensive capacitor list. The table below is a
selection guide for input and output capacitors. Other capacitor
vendors are available with comparable RMS ripple current rating
and ESR (Equivalent Series Resistance at 100kHz). These
critical parameters are necessary to insure both optimum regulator
performance and long capacitor life.
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相關(guān)代理商/技術(shù)參數(shù) |
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| PT7743 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-A Low-Voltage Programmable Integrated Switching Regulator |
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| PT7744 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:20 Amp ＇Current Booster＇ for PT7712 ISR |
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