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| 型号： | PT6717C |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 14 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA17 |
| 封装： | SMD-17 |
| 文件页数： | 7/9页 |
| 文件大小： | 230K |
| 代理商： | PT6717C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Table 3-1 Capacitors Characteristic Data
Capacitor Recommendations for
the Non-Isolated
13-A Excalibur Series of Regulators
Input Capacitors
The recommended input capacitor(s) is determined by
the 2 ampere (rms) minimum ripple current rating and
1,000F minimum capacitance. Ripple current and
≤100m ESR (Equivalent Series Resistance) values are
the major considerations, along with temperature, when
selecting the proper capacitor. Tantalum capacitors have a
recommended minimum voltage rating of 2
× the input
voltage; 10V for +5V operation.
Output Capacitors
The minimum required output capacitance is 330F
with a maximum ESR
≤100m. Failure to observe this
requirement may lead to regulator instability or oscilla-
tion. 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 current excur-
sions. Preferred low ESR type capacitor part numbers
are identified in Table 3-1 below.
Tantalum Characteristics
Tantalum capacitors with a minimum 10V rating are
recommended for the input bus, but only the AVX TPS,
Sprague 594/595, or Kemet T495/T510 series. These
types are recommended over many others due to their
higher surge current, power dissipation and ripple cur-
rent capability. 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 also less reliable
compared to the TPS series when determining power
dissipation capability. Tantalum capacitors are highly
recommended in applications where ambient tempera-
tures fall below 0°C.
Capacitor Table
Table 3-1 identifies the characteristics of capacitors from
a number of vendors with acceptable ESR and ripple cur-
rent (rms) ratings. The suggested minimum quantities per
regulator for both the input and output buses are iden-
tified.
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 the critical
parameters to insure both optimum regulator performance
and long capacitor life.
PT6701/PT6702/PT6703,
PT6705 & PT6715 Series
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