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參數(shù)資料
| 型號： | PT6516LT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 725 kHz SWITCHING FREQ-MAX, PSMA14 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大小： | 232K |
| 代理商： | PT6516LT |
Application Notes
For technical support or further information, visit http://power.ti.com
Table 2-1: Suggested Input/Output Capacitors
N/R –Not recommended. The ripple current rating and ESR does not meet the requirements.
Capacitor Recommendations for
the PT6510 Series of
Integrated Switching Regulators
Input Capacitors:
The recommended input capacitance is determined by
330 F minimum value (300 F for Oscon or low-ESR
tantalum types), and 1 A minimum ripple current rating.
Ripple current and less than 100 m
equivalent series
resistance (ESR) are the major parameters, along with
temperature, when selecting an input capacitor. Tanta-
lum capacitors have a recommended minimum voltage
rating of twice 2
× (max. DC voltage + AC ripple). This
is standard practice to insure reliability.
Output Capacitors:
The ESR of the required output capacitor must not be
greater than 150 m
. Electrolytic capacitors have poor
ripple performance at frequencies greater than 400 kHz
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 2-1.
Tantalum Capacitors
Tantalum type capacitors may 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
determining power dissipation capability. Tantalum or
Oscon types are recommended for applications where
ambient temperatures fall below 0 °C.
Capacitor Table
Table 2-1 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
(at 100 kHz) are critical parameters necessary to insure both
optimum regulator performance and long capacitor life.
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