參數(shù)資料
型號: ATH22T05
英文描述: MOTOR, VIB,1.3V/70MA,7500RPM, 0.13OZ,4.7" LEADS,7MM DIA
中文描述: 22甲,5 V輸入非隔離寬輸出調(diào)節(jié)電源模塊
文件頁數(shù): 6/14頁
文件大?。?/td> 313K
代理商: ATH22T05
Application Notes
North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662
Table 2-1: Input/Output Capacitors
ATH22T033/T05: Capacitor Recommendations
Input Capacitor
The recommended input capacitor(s) is determined by
the 1,000 μF
(1)
minimum capacitance and 700 mArms
minimum ripple current rating.
Ripple current and <100 m
equivalent series resistance
(ESR) values are the major considerations, along with
temperature, when designing with different types of
capacitors. Tantalum capacitors have a recommended
minimum voltage rating of
2
×
(the maximum DC voltage
+ AC ripple). This is standard practice for tantalum
capacitors to insure reliability.
Ceramic Capacitors
Ceramic capacitors may be substituted for electrolytic
types using the minimum capacitance, for improved
ripple reduction on the input bus.
Output Capacitors (Optional)
The recommended ESR of the capacitors is equal to or
less than 150 m
. Electrolytic capacitors have marginal
ripple performance at frequencies greater than 400 kHz
but excellent low frequency transient response. Above
the ripple frequency, ceramic capacitors are necessary to
improve the transient response and reduce any high
frequency noise components apparent during higher
current excursions. Preferred low ESR type capacitor part
numbers are identified in Table 2-1.
Tantalum Capacitors
Tantalum type capacitors can be used for the output, but
only the AVX TPS, Sprague 593D/594/595or Kemet
T495/T510 series. These capacitors are recommended
over many other tantalum types due to their higher rated
surge, power dissipation, and ripple current capability.
As a caution the TAJ series by AVX is not recommended.
This series has considerably higher ESR, reduced power
dissipation, and lower ripple current capability. The TAJ
series is less reliable than the AVX TPS series when
determining power dissipation capability. Tantalum,
ceramic, or Os-con types are recommended for applica-
tions where ambient temperatures fall below 0 °C.
Capacitor Table
Table 2-1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The 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 100kHz) are critical parameters necessary to insure
both optimum regulator performance and long capacitor life.
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ATH22T033 & ATH22T05 Series
(1) Total capacitance of 940 μF is acceptable based on the combined ripple current rating.
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