參數(shù)資料
型號： PT5821C
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 16 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA18
封裝： SMD-18
文件頁數(shù)： 12/12頁
文件大小： 207K
代理商： PT5821C
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Table 4-1: Input/Output Capacitors
(1) N/R –Not recommended. The voltage rating does not meet the minimum operating limits.
(2) Recommended Input capacitor when Vo<2.6V; lower RMS mA required .
Capacitor Recommendations for
the
PT5820 Regulator Series
Input Capacitor:
The recommended input capacitance is determined by
1.3 ampere minimum ripple current rating and 560F
minimum capacitance.
Ripple current and <100m
equivalent series resistance
(ESR) values are the major considerations, along with
temperature, when designing with different types of
capacitors. Tantalum capacitors have a recommended
minimum voltage rating of twice the maximum DC
voltage + AC ripple. This is necessary to insure reli-
ability for input voltage bus applications.
Output Capacitors:
The maximum allowable ESR of the output capacitor is
150m
. Electrolytic capacitors have marginal ripple
performance at frequencies greater than 400kHz but
excellent low frequency transient response. Above the
ripple frequency, 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 4-1.
PT5820 Series
Tantalum Capacitors
Tantalum type capacitors can be used for the output but
only the AVX TPS, Sprague 593D/594/595 or Kemet
T495/T510 series. These capacitors are recommended
over many other tantalum 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 less reliable than the AVX TPS series when deter-
mining power dissipation capability. Tantalum or Oscon
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 cur-
rent (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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