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| 型号： | PTN78060AAZT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 15 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, DIP-7 |
| 文件页数： | 2/19页 |
| 文件大小： | 589K |
| 代理商： | PTN78060AAZT |
www.ti.com
CAPACITOR RECOMMENDATIONS FOR THE PTN78060 WIDE-OUTPUT
Input Capacitor
Output Capacitor
Ceramic Capacitors
Tantalum Capacitors
Capacitor Table
SLTS245B – APRIL 2005 – REVISED AUGUST 2006
ADJUST POWER MODULES
The minimum requirement for the input bus is 100
F of nonceramic capacitance and 14.1 F (3× 4.7 F) of
ceramic capacitance, in either an X5R or X7R temperature characteristic. Ceramic capacitors should be located
within 0.5 inch (1,27 cm) of the regulator's input pins. Electrolytic capacitors can be used at the input, but only in
addition to the required ceramic capacitance. The minimum ripple current rating for any nonceramic capacitance
must be 350 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 more ceramic capacitors at the
input, in addition to the minimum required 14.1 F.
Tantalum capacitors are not recommended for use at the input bus, as none were found to meet the minimum
voltage rating of 2 × (maximum dc voltage + ac ripple). The 2× rating is standard practice for regular tantalum
capacitors to ensure reliability. Polymer-tantalum capacitors are more reliable, and are available with a
maximum rating of typically 20 V. These can be used with input voltages up to 16 V.
The minimum capacitance required to ensure stability is a 100-
F capacitor. Either ceramic or electrolytic-type
capacitors can be used. The minimum ripple current rating for the nonceramic capacitance must be at least
200 mA rms. The stability of the module and voltage tolerances is compromised if the capacitor is not placed
near the output bus pins. A high-quality, computer-grade electrolytic capacitor should be adequate. A ceramic
capacitor can be also be located within 0.5 inch (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
recommended capacitors and vendors are identified in Table 3.
Above 150 kHz, the performance of aluminum electrolytic capacitors becomes less effective. To further reduce
the reflected input ripple current, or improve 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 200 F.
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.
The capacitor table, Table 3, identifies the characteristics of capacitors from 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 rating and ESR (at 100 kHz)
are critical parameters necessary to ensure both optimum regulator performance and long capacitor life.
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