SMPS Capacitors
Capacitor Performance
AC Ripple Capability
Due to the wide range of product offering in this catalog, the
AC ripple capabilities for switch mode power supply capacitors
and high voltage capacitors are provided in the form of IBM
compatible software package called SpiCalci. It is available
free from AVX and can be downloaded for free from AVX
website: www.avx.com.
SpiCalci program will provide answers to most of the design
engineers’ questions on critical parameters for their specific
applications:
• Equivalent Series Resistance
- function of frequency and temperature
• Equivalent Series Inductance
- function of design
• Self Resonant Frequency
f = 1/ (2 x
π
L x C)
• Thermal Characteristics
- function of design
• AC Ripple Capabilities
- function of frequency, temperature and design
Examples of Product Performance
FOR SM04 STYLE CAPACITORS
4.7µF
9µF
1µF
10.000
TYPICAL ESR -vs- Frequency
@ 100 KHz & 25 C Ambient
ASSUMING MAX. CAP. FOR SINGLE CHIP CONSTRUCTION
50
45
40
MAXIMUM RMS CURRENT FOR 50 VDC, CH - X7R
1.000
ESR (Ohms)
A RMS
10.0
100.0
Frequency (kHz)
1000.0
35
30
25
20
0.100
0.010
15
10
0.001
1.0
5
0
6.8
CH41
8.7
CH51
10.4
CH61
16.5
11.9
CH71 CH76
STYLE
EXAMPLE (CH ONLY)
29.9
CH81
26.6
CH86
28.8
CH91
MAXIMUM RMS CURRENT FOR 50 WVDC, SM - X7R
@ 100 KHz & 25 C Ambient
ASSUMING MAX. CAP. FOR SINGLE CHIP CONSTRUCTION
50
45
40
100 KHz ARMS
35
30
25
20
15
10
5
0
36.8
SM01
28.3
SM02
22.7
9.7
SM03
SM04
STYLE
EXAMPLE (SM ONLY)
MAXIMUM RMS CURRENT FOR 25 WVDC, SK - Z5U
@ 100 KHz & 25 C Ambient
ASSUMING MAX. CAP. FOR EACH STYLE
12
100 KHz ARMS
10
8
6
4
2
0
1.7
SK01
4.5
SK04
6.2
SK05
7.4
7.7
SK06 SK07
STYLE
EXAMPLE (SK ONLY)
11.0
SK08
6.7
SK09
8.7
SK10
5.7
SM05
33.8
SM06
6
AVX [ AVX CORPORATION ]
