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| 型号： | PTH12020WAST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | DIP-10 |
| 文件页数： | 2/27页 |
| 文件大小： | 930K |
| 代理商： | PTH12020WAST |
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Capacitor Recommendations for the PTH12020 Series of Power Modules
Input Capacitor
Output Capacitors (Optional)
Ceramic Capacitor
Tantalum Capacitors
Capacitor Table
SLTS208I – MAY 2003 – REVISED MARCH 2009 ............................................................................................................................................................. www.ti.com
The recommended input capacitance is determined by the 560
F minimum capacitance and 800 mArms
minimum ripple current rating.
Ripple current, less than 100 m
equivalent series resistance (ESR), and temperature are major considerations
when selecting input capacitors. Unlike polymer-tantalum capacitors, regular tantalum capacitors are not
recommended for the input bus. These capacitors require a recommended minimum voltage rating of
2×(maximum DC voltage + AC ripple). This is standard practice to ensure reliability. There were no tantalum
capacitors, with sufficient voltage rating, found to meet this requirement. When the operating temperature is
below 0°C, the ESR of aluminum electrolytic capacitors increases. For these applications Os-Con,
polymer-tantalum, and polymer-aluminum types should be considered.
Adding a 10-
F ceramic capacitor to the input will reduce the ripple current reflected into the input source.
For applications with load transients, the regulator response will benefit from external output capacitance. The
recommended output capacitance of 330
F will allow the module to meet its transient response specification
(see product data sheet). For most applications, a high quality computer-grade aluminum electrolytic capacitor is
adequate. These capacitors provide decoupling over the frequency range, 2 kHz to 150 kHz, and are suitable
when ambient temperatures are above 0°C. For operation below 0°C, tantalum, ceramic, or Os-Con type
capacitors are recommended. When using one or more non-ceramic capacitors, the calculated equivalent ESR
should be no lower than 4 m
(7 m using the manufacturer's maximum ESR for a single capacitor). A list of
preferred low-ESR type capacitors are identified in Table 4.
Above 150 kHz the performance of aluminum electrolytic capacitors is less effective. Multilayer ceramic
capacitors have very low ESR and a resonant frequency higher than the bandwidth of the regulator. They can be
used to reduce the reflected ripple current at the input as well as improve the transient response of the output.
When used on the output their combined ESR is not critical as long as the total value of ceramic capacitance
does not exceed 300
F. Also, to prevent the formation of local resonances, do not place more than five identical
ceramic capacitors in parallel with values of 10
F or greater.
Tantalum type capacitors can only be used on the output bus, and are recommended for applications where the
ambient operating temperature can be less than 0°C. The AVX TPS, Sprague 593D/594/595 and Kemet
T495/T510 capacitor series are suggested over many other tantalum types due to their higher rated surge, power
dissipation, and ripple current capability. As a caution many general purpose tantalum capacitors have
considerably higher ESR, reduced power dissipation and lower ripple current capability. These capacitors are
also less reliable as they have reduced power dissipation and surge current ratings. Tantalum capacitors that
have no stated ESR or surge current rating are not recommended for power applications.
When specifying Os-con and polymer tantalum capacitors for the output, the minimum ESR limit will be
encountered well before the maximum capacitance value is reached.
Table 4 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple
current (rms) ratings. The recommended 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 (at 100 kHz) are critical
parameters necessary to insure both optimum regulator performance and long capacitor life.
10
Copyright 2003–2009, Texas Instruments Incorporated
Product Folder Link(s) :PTH12020W/L
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