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| 型号： | PTH08T261WAZT |
| 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： | ROHS COMPLIAT PACKAGE-10 |
| 文件页数： | 6/38页 |
| 文件大小： | 1206K |
| 代理商： | PTH08T261WAZT |
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SLTS272F
– DECEMBER 2006 – REVISED APRIL 2011
CAPACITOR RECOMMENDATIONS FOR THE PTH08T260/261W POWER MODULE
Capacitor Technologies
Electrolytic Capacitors
When using electrolytic capacitors, high quality, computer-grade electrolytic capacitors are recommended.
Aluminum electrolytic capacitors provide adequate decoupling over the frequency range, 2 kHz to 150 kHz,
and are suitable when ambient temperatures are above -20
°C. For operation below -20°C, tantalum,
ceramic, or OS-CON type capacitors are required.
Ceramic Capacitors
Above 150 kHz the performance of aluminum electrolytic capacitors is less effective. Multilayer ceramic
capacitors have a 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.
Tantalum, Polymer-Tantalum Capacitors
Tantalum type capacitors may only used on the output bus, and are recommended for applications where the
ambient operating temperature is less than 0
°C. The AVX TPS series and Kemet capacitor series are
suggested over many other tantalum types due to their lower ESR, higher rated surge, power dissipation,
and ripple current capability. Tantalum capacitors that have no stated ESR or surge current rating are not
recommended for power applications.
Input Capacitor (Required)
The PTH08T261W requires a minimum input capacitance of 300
μF of ceramic type.
The PTH08T260W requires a minimum input capacitance of 330
μF. The ripple current rating of the capacitor
must be at least 350 mArms. An optional 22-
μF X5R/X7R ceramic capacitor is recommended to reduce the RMS
ripple current. When operating with an input voltage greater than 8 V, the minimum required input capacitance
may be reduced to a 220-
μF electrolytic plus a 22-μF ceramic.
Input Capacitor Information
The size and value of the input capacitor is determined by the converter
’s transient performance capability. This
minimum value assumes that the converter is supplied with a responsive, low inductance input source. This
source should have ample capacitive decoupling, and be distributed to the converter via PCB power and ground
planes.
Ceramic capacitors should be located as close as possible to the module's input pins, within 0.5 inch (1,3 cm).
Adding ceramic capacitance is necessary to reduce the high-frequency ripple voltage at the module's input. This
will reduce the magnitude of the ripple current through the electroytic capacitor, as well as the amount of ripple
current reflected back to the input source. Additional ceramic capacitors can be added to further reduce the RMS
ripple current requirement for the electrolytic capacitor.
Increasing the minimum input capacitance to 680
F is recommended for high-performance applications, or
wherever the input source performance is degraded.
The main considerations when selecting input capacitors are the RMS ripple current rating, temperature stability,
and less than 100 m
of equivalent series resistance (ESR).
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.
No tantalum capacitors were found with a sufficient voltage rating to meet this requirement.
When the operating temperature is below 0
°C, the ESR of aluminum electrolytic capacitors increases. For these
applications, OS-CON, poly-aluminum, and polymer-tantalum types should be considered.
14
Copyright
2006–2011, Texas Instruments Incorporated
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