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| 型号： | PT8139A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 30 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, MSMA31 |
| 文件页数： | 5/9页 |
| 文件大小： | 184K |
| 代理商： | PT8139A |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT8120 Series & PT8139
Capacitor Recommendations for the
PT8120 Series of Programmable ISRs
Input Capacitors
The recommended input capacitor(s) is determined by
1.6 Arms minimum ripple current rating and 1,500F
minimum capacitance. Ripple current and Equivalent
Series Resistance (ESR) values are the major considerations
along with temperature when selecting the proper capaci-
tor. The tantalum capacitors listed below cannot be used
on the input bus since they are not rated for 12V operation.
Output Capacitors
The minimum required output capacitance is 660F
(organic/polymer), or 1,200 (aluminum electrolytic) with
a maximum ESR less than or equal to 50m
. Failure to
observe this requirement may lead to regulator instabil-
ity 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 nec-
essary to improve the transient response and reduce any
microprocessor high frequency noise components apparent
during higher current excursions. Preferred low ESR type
capacitor part numbers are identified in the Table 1 below.
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Note: (N/R -Not recommended) The 10V-rated tantalum capacitors cannot be used on the input bus.
Table 1 Capacitors Characteristic Data
Tantalum Characteristics
Tantalum capacitors are recommended on the output bus
but only AVX TPS Series, Sprague 593D/594/595 Series,
or Kemet T495/T510,520 Series. These capacitors are
recommended 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 rec-
ommended. This series exhibits considerably higher ESR,
reduced power dissipation and lower ripple current capa-
bility. The TAJ Series is also 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. 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 are necessary to insure both optimum
regulator performance and long capacitor life.
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