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参数资料
| 型号： | PT7681N |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 30 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, MSMA27 |
| 封装： | ROHS COMPLIANT, METAL, SIP-27 |
| 文件页数： | 11/14页 |
| 文件大小： | 305K |
| 代理商： | PT7681N |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Table 2-1: Input/Output Capacitors
Capacitor Recommendations for
the PT7680
Series of 30-A Switching Regulators
Input Capacitor:
The recommended input capacitance is determined by
1.1A minimum ripple current rating and 1500F mini-
mum 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 reliabil-
ity for input voltage bus applications.
Output Capacitors:
The ESR of the required capacitors is less than 100m
. .
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 2-1.
PT7680 Series
Tantalum Capacitors( Optional Output Capacitors)
Tantalum type capacitors can 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 ca-
pability. The TAJ series is also less reliable than the AVX
TPS series when determining power dissipation capa-
bility. 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 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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