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参数资料
| 型号： | PTH03060YAZT |
| 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 COMPLIANT, DIP-10 |
| 文件页数： | 2/19页 |
| 文件大小： | 823K |
| 代理商： | PTH03060YAZT |
www.ti.com
CAPACITOR
RECOMMENDATIONS
FOR
THE
PTH12060Y
DDR
POWER
MODULES
PTH03060Y
PTH05060Y, PTH12060Y
SLTS222A–MARCH 2004–REVISED OCTOBER 2005
(12-V OPTION)
Input Capacitor
The recommended input capacitance is determined by the 560 F [1] minimum capacitance and 750 mArms
minimum ripple current rating. A 10-F X5R/X7R ceramic capacitor can be added to reduce the reflected input
ripple current. The ceramic capacitor should be located between the input electrolytic and the module.
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 have a
recommended minimum voltage rating of 2 × (max. dc voltage + ac ripple). No tantalum capacitors were found
with sufficient voltage rating to meet this requirement. At temperatures below 0°C, the ESR of aluminum
electrolytic capacitors increases. For these applications, Os-Con, polymer-tantalum, and polymer-aluminum types
should be considered.
Output Capacitors
For applications with load transients (sudden changes in load current), regulator response will benefit from
external output capacitance. The recommended output capacitance of 940F will allow the module to meet its
transient response specification (See Electrical Specifications table). 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. 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 2.
In addition to electrolytic capacitance, adding a 10-F to 22-F X5R/X7R ceramic capacitor to the output reduces
the output ripple voltage and improves the regulator's transient response. The measurement of both the output
ripple and transient response is also best achieved across a 10-F ceramic capacitor.
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, and 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 600 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 Capacitors
Tantalum type capacitors are most suited for use 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 lower 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 is encountered
well before the maximum capacitance value is reached.
Capacitor Table
Table 2 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.
Note: 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
相关PDF资料 |
PDF描述 |
|---|---|
| PTH05060YAST | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH05060YAZ | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH03060YAST | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH12060YAST | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH12060YAZ | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
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| PTH03060YBH | 制造商:Texas Instruments 功能描述: |
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