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参数资料
| 型号： | PT6701C |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 13 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA23 |
| 封装： | SIP-23 |
| 文件页数： | 6/8页 |
| 文件大小： | 172K |
| 代理商： | PT6701C |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Table 1 Capacitors Characteristic Data
Input Capacitors
The recommended input capacitance is determined by the
2.0 ampere minimum ripple current rating and 1000F
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 330F 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
performance at frequencies greater than 400kHz, but
excellent low frequency transient response. Above the
ripple frequency ceramic decoupling capacitors are necessary
to improve the transient response and reduce any high
frequency noise components apparent during higher cur-
rent excursions. Preferred low ESR type capacitor part
numbers are identified in Table 1 below.
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 a caution, 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
regulator for both the input and output buses are identified.
This is not an extensive capacitor list. The table below is a
suggested 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.
Capacitor Recommendations for
the Non-Isolated
13-A Excalibur Series of Regulators
PT6701, PT6702, PT6705 Series,
& PT6715 Series
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