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參數(shù)資料
| 型號(hào)： | PTH05050WAZ |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-6 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 1147K |
| 代理商： | PTH05050WAZ |
CAPACITOR RECOMMENDATIONS FOR THE PTH03050W AND PTH05050W
Input Capacitor
Output Capacitors (Optional)
Ceramic Capacitors
Tantalum Capacitors
Capacitor Table
SLTS213E – MAY 2003 – REVISED MARCH 2009............................................................................................................................................................ www.ti.com
The recommended input capacitor(s) is determined by the 100
F minimum capacitance and 300 mArms
minimum ripple current rating.
Ripple current, less than 100 m
equivalent series resistance (ESR), and temperature are the major
considerations when selecting input capacitors. Unlike polymer tantalum, regular tantalum capacitors have a
recommended minimum voltage rating of 2 ×(maximum DC voltage + AC ripple). This is standard practice to
ensure reliability.
For improved ripple reduction on the input bus, ceramic capacitors may used to compliment electrolytic types to
achieve the minimum required capacitance.
For applications with load transients (sudden changes in load current), regulator response will benefit from an
external output capacitance. The recommended output capacitance of 100
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 for ambient temperatures 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 3.
Above 150 kHz the performance of aluminum electrolytic capacitors becomes less effective. To further improve
the reflected input ripple current or the output transient response, multilayer ceramic capacitors can also be
added. Ceramic capacitors have very low ESR and their resonant frequency is higher than the bandwidth of the
regulator. 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 be used at both the input and output, 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 do
not have a 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 3 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.
8
Copyright 2003–2009, Texas Instruments Incorporated
Product Folder Link(s) :PTH05050W
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