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參數(shù)資料
| 型號： | PTN04050CAS |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | DIP-4 |
| 文件頁數(shù)： | 19/19頁 |
| 文件大?。?/td> | 640K |
| 代理商： | PTN04050CAS |
SLTS251A
– SEPTEMBER 2005 – REVISED FEBRUARY 2011
CAPACITOR RECOMMENDATIONS FOR PTN04050C WIDE-OUTPUT
ADJUST POWER MODULES
Input Capacitor
The minimum required input capacitance is 100
μF. The minimum ripple current rating for any nonceramic
capacitance must be greater than 250 mA rms. The ripple current rating of electrolytic capacitors is a major
consideration when they are used at the input. This ripple current requirement can be reduced by placing
ceramic capacitors at the input, in addition to the minimum required capacitance.
When specifying regular tantalum capacitors for use at the input, a minimum voltage rating of 2 X (maximum dc
voltage + ac ripple) is highly recommended. This is standard practice to ensure reliability. Polymer-tantalum
capacitors are not affected by this requirement. (Please verify voltage derating for the polymer-tantalum
capacitors from the vendors.)
Output Capacitor
The minimum capacitance required to insure stability is a 100
μF. A combination of both ceramic and
electrolytic-type capacitors should be used. The minimum ripple current rating for the nonceramic capacitance
must be at least 150 mA rms. When using ceramic capacitors equivalent to 100
μF, a 100 μF bulk electrolytic is
also required. The stability of the module and voltage tolerances are compromised if the capacitor is not placed
near the output pin. A high-quality, computer-grade electrolytic capacitor is adequate. Ceramic capacitance
should also be located within 0.5 inches (1,27 cm) of the output pin.
For applications with load transients (sudden changes in load current), the regulator response improves with
additional capacitance. Additional electrolytic capacitors should be located close to the load circuit. These
capacitors provide decoupling over the frequency range, 2 kHz to 150 kHz. Aluminum electrolytic capacitors are
suitable for ambient temperatures above 0
°C. For operation below 0°C, tantalum or OS-CON type capacitors are
recommended. When using one or more nonceramic capacitors, the calculated equivalent ESR should be no
lower than 10 m
(17 m using the manufacturer's maximum ESR for a single capacitor). A list of capacitors
and vendors are identified in Table 3, the recommended capacitor table.
Ceramic Capacitors
Above 150 kHz the performance of aluminum electrolytic capacitors becomes less effective. To further reduce
the reflected input ripple current, or the output transient response, multilayer ceramic capacitors must be added.
Ceramic capacitors have low ESR and their resonant frequency is higher than the bandwidth of the regulator.
When placed at the output, their combined ESR is not critical as long as the total value of ceramic capacitance
does not exceed 100
μF.
Note: If only ceramics are used on the output bus, then a 100
μF electrolytic is required for stabilization.
Tantalum Capacitors
Tantalum type capacitors may be used at the 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/T520 capacitors series are suggested over many other tantalum types due to their 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
The capacitor table, Table 3, identifies the characteristics of capacitors from various 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 current rating and
ESR (at 100 kHz) are critical parameters necessary to insure both optimum regulator performance and long
capacitor life.
2005–2011, Texas Instruments Incorporated
9
Product Folder Link(s): PTN04050C
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