ATH22T05 Datasheet, PDF (6/14 Pages) Astec America, Inc – 22-A, 5-V Input Non-Isolated Wide-Output Adjust Power Module

Application Notes
ATH22T033 & ATH22T05 Series
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 mΩ 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 mΩ. 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
Table 2-1: Input/Output Capacitors
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.
Capacitor Vendor/
Series
Capacitor Characteristics
Quantity
Panasonic
FC (Radial)
FK (Surface Mt.)
United Chemi-con
PXA (Surface Mt.)
FX
LXZ Series
Working
Voltage
10 V
10 V
25 V
10 V
6.3 V
6.3 V
10 V
10 V
Value(µF)
560
1000
1000
1000
470
1000
680
1000
(ESR) Equivalent
Series Resistance
0.090 Ω
0.068 Ω
0060 Ω
0.080 Ω
0.020 Ω
0.013 Ω
0.090 Ω
0.068 Ω
105°C Maximum
Ripple
Current(Irms)
755 mA
1050 mA
1100 mA
850 mA
4130 mA
4935 mA
760 mA
1050 mA
Physical
Size(mm)
10×12.5
10×16
12.5×13.5
10×10.2
10×7.7
10×10.5
10×12.5
10×16
Input
Bus
Output
Bus
Vendor Part Number
2
1 EEUFC1A561
1
1 EEUFC1A102
1
1 EEVFK1E102Q
1
1 EEVFK1A102P
2 (1)
1 PXA6.3VC471MJ80TP
1
1 6FX1000M
2
1 LXZ10VB681M10X12LL
1
1 LXZ10VB102M10X16LL
Nichicon
PM Series
6.3 V
10 V
16 V
1000
1000
1000
0.053 Ω
0.065 Ω
0.055 Ω
1030 mA
1060mA
4400 mA
10x12.5
16×15
10×10
Sanyo-Os-con:
SP
SVP (Surface Mt.)
AVX Tantalum
TPS (Surface Mt.)
Kemet Polymer
Tantalum
T520/T530 Series
(Surface Mt.)
Sprague Tantalum
595D Series
(Surface Mt.)
10 V
470
10 V
560
10 V
470
10 V
470
10 V
330
10 V
330
10 V
470
0.015 Ω
0.013 Ω
0.045 Ω
0.060 Ω
0.040 Ω
0.015 Ω
0.100Ω
>4500 mA
>5200 mA
1723 mA
1826 mA
1800 mA
>3800 mA
1440 mA
10×10.5
10×12.7
7.3L
×5.7W
×4.1H
4.3W
×7.3L
×4.0H
7.2L
×6W
×4.1H
(1) Total capacitance of 940 µF is acceptable based on the combined ripple current rating.
1
1 UHD0J102MPR
1
1 UPM1A102MPH6
1
1 UPM1C 102MHH6
2 (1)
1 10SP470M
2
1 10SVP560M
2 (1)
1 TPSE477M010R0045
2 (1)
1 TPSV477M010R0060
3
1 T520X337M010AS
3
1 T530X337M010AS
2 (1)
1 595D477X0010R2T
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