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参数资料
| 型号： | PTH05060WAST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 36 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | PLASTIC PACKAGE-10 |
| 文件页数： | 15/19页 |
| 文件大小： | 593K |
| 代理商： | PTH05060WAST |
Application Notes
For technical support and further information visit http://power.ti.com
PTH03060W & PTH05060W
Capacitor Recommendations for
the PTH03060 &
PTH05060 Series of Power Modules
Input Capacitor
The recommended input capacitor(s) is determined by
the 330 F minimum capacitance and 500 mArms mini-
mum ripple current rating.
Ripple current, less than 150 m
equivalent series resis-
tance (ESR), and temperature are the major considerations
when selecting input capacitors. Unlike polymer tantalum,
regular tantalum capacitors have a recommended mini-
mum voltage rating of 2
× (maximum DC voltage + AC
ripple). This is standard practice to ensure reliability.
For improved ripple reduction on the input bus, ceramic
capacitors [1] may used to compliment electrolytic types
to achieve the minimum required capacitance.
Output Capacitors (Optional)
For applications with load transients (sudden changes in
load current), regulator response will benefit from an
external output capacitance. The recommended output
capacitance of 330 F will allow the module to meet
its transient response specification (see product data sheet).
For most applications, a high quality computer-grade
aluminum electrolytic capacitor is adequate. These capaci-
tors provide decoupling over the frequency range, 2 kHz
to 150 kHz, and are suitable for ambient temperatures
above 0 °C. For operation below 0 °C tantalum, ceramic
or Os-Con type capacitors are recommended. When using
one or more non-ceramic capacitors, the calculated equiva-
lent 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 2-1.
Ceramic Capacitors
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 par-
allel with values of 10 F or greater.
Tantalum Capacitors
Tantalum type capacitors can be used at both the input
and 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 capacitor series are suggested over many other
tantalum types due to their higher rated surge, power
dissipation, and ripple current capability. As a caution
many general purpose tantalum capacitors have consid-
erably 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 will be encoun-
tered well before the maximum capacitance value is
reached.
Capacitor Table
Table 2-1 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.
Designing for Very Fast Load Transients
The transient response of the DC/DC converter has been
characterized using a load transient with a di/dt of 1 A/s.
The typical voltage deviation for this load transient is
given in the data sheet specification table using the
optional value of output capacitance. As the di/dt of a
transient is increased, the response of a converter’s regu-
lation circuit ultimately depends on its output capacitor
decoupling network. This is an inherent limitation with
any DC/DC converter once the speed of the transient
exceeds its bandwidth capability. If the target application
specifies a higher di/dt or lower voltage deviation, the
requirement can only be met with additional output
capacitor decoupling. In these cases special attention
must be paid to the type, value and ESR of the capacitors
selected.
If the transient performance requirements exceed that
specified in the data sheet, or the total amount of load
capacitance is above 3,000 F, the selection of output
capacitors becomes more important. For further guidance
consult the separate application note, “Selecting Output
Capacitors for PTH Products in High-Performance Applica-
tions.”
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