參數(shù)資料
型號(hào)： PTH12030LAS
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封裝： DIP-13
文件頁(yè)數(shù)： 2/26頁(yè)
文件大?。?/td> 794K
代理商： PTH12030LAS
CAPACITOR RECOMMENDATIONS FOR THE PTH12030 SERIES OF POWER MODULES
INPUT CAPACITOR
OUTPUT CAPACITORS (OPTIONAL)
CERAMIC CAPACITORS
TANTALUM CAPACITORS
CAPACITOR TABLE
SLTS211H – MAY 2003 – REVISED DECEMBER 2008 .................................................................................................................................................... www.ti.com
The recommended input capacitor(s) is determined by the 560 F minimum capacitance and 500 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 capacitors, regular tantalum capacitors
are not recommended for the input bus. These capacitors require a recommended minimum voltage rating of 2 ×
(max. dc voltage + ac ripple). 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 one or two ceramic capacitors to the input further reduces high-frequency reflected ripple current.
For applications with load transients, regulator response benefits from an external output capacitance. The
recommended output capacitance of 330 F allows the module to meet its transient response specification. For
most applications, a high quality computer-grade aluminum eletrolytic 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 nonceramic 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 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 300F. 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 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 is 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 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): PTH12030W/L
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PTH12030LAST 功能描述:DC/DC轉(zhuǎn)換器 0.8 to 1.8V 26A 12V Input WideAdj Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTH12030LAZ 功能描述:DC/DC轉(zhuǎn)換器 10.2-13.8Vin 1.8V26A 1.370" x1.120"x0.354 RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTH12030LAZT 功能描述:DC/DC轉(zhuǎn)換器 0.8 to 1.8V 26A 12V Input WideAdj Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTH12030W 制造商:未知廠家 制造商全稱:未知廠家 功能描述:26 A. 12-V Input Wide-Output Adjust Plug-in Power Module
PTH12030WAD 功能描述:DC/DC轉(zhuǎn)換器 1.2 to 5.5V 26A 12V Input WideAdj Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
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