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| 型號(hào)： | PT6521P |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA14 |
| 封裝： | VERTICAL MOUNT PACKAGE-14 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大小： | 211K |
| 代理商： | PT6521P |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Table 1: Input/Output Capacitors
N/R –Not recommended. The ripple current rating and ESR does not meet the requirements.
Capacitor Recommendations for
the PT6520 Series of
Integrated Switching Regulators
Input Capacitors:
The recommended input capacitance is determined by
1.0 ampere minimum ripple current rating and 330F
minimum capacitance (300F for Oscon or low ESR
tantalum). 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 recom-
mended minimum voltage rating of 2
× the maximum
DC voltage + AC ripple. This is necessary to insure
reliability for input voltage bus applications
Output Capacitors:
The ESR of the required capacitor (Cout) must not be
greater than 150m
. Electrolytic capacitors have poor
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 1.
PT6520 Series
Tantalum Capacitors
Tantalum type capacitors may be used for the output but
only the AVX TPS series, Sprague 593D/594/595 series
or Kemet T495/T510 series. These capacitors are rec-
ommended 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 appli-
cations 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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