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參數(shù)資料
| 型號： | PTH03010YAZ |
| 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, DIP-20 |
| 文件頁數(shù)： | 2/18頁 |
| 文件大?。?/td> | 773K |
| 代理商： | PTH03010YAZ |
www.ti.com
CAPACITOR RECOMMENDATIONS FOR THE PTH12010Y DDR POWER MODULES
INPUT CAPACITOR
OUTPUT CAPACITORS
CERAMIC CAPACITORS
TANTALUM CAPACITORS
CAPACITOR TABLE
PTH03010Y
PTH05010Y
PTH12010Y
SLTS223A–MARCH 2004–REVISED OCTOBER 2005
(12-V OPTION)
The recommended input capacitance is determined by the 560 F minimum capacitance and 750 mArms
minimum ripple current rating. A 10-F X5R/X7R ceramic capacitor may also 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). This is standard practice to ensure
reliability. 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.
For applications with load transients (sudden changes in load current), regulator response benefits from external
output capacitance. The recommended output capacitance of 940 F will allow the modue to meet its transieint
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 improve 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.
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 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 are encountered
well before the maximum capacitance value is reached.
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.
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
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