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DOC-MN-007-03 VCCM600 User Manual
Vox Power Limited | Unit 2, Red Cow Interchange Estate, Ballymount, Dublin 22, D22 Y8H2, Ireland | T +353 1 4591161 | www.vox-power.com
Reliability
The VCCM600 series has undergone extensive testing, including HALT and Environmental testing. Reliability data is collected on an ongoing basis. Please contact
Vox Power or your distributor for the most up to date reliability data.
The reliability data quoted in the datasheets are the calculated
failures per million hours (FPMH) using the Telcordia SR-332, issue 2 standard. The procedure
defined in SR-332 allows several different techniques to be used for calculating MTBF and when evaluating competing MTBF figures it is important that only the
same techniques are compared.
The quoted VCCM reliability figures use Method I Case 3, Ground, Fixed, Controlled which specifies an ambient temperature of 30°C and an upper confidence
level of 90%. It is also assumed that the product is operated at 100% duty cycle, has an input voltage of 220V
RMS
, an output power of 600W and that the baseplate
temperature is the same as the ambient temperature.
The table below shows a summary of the FPMH & MTBF for all system components and for a typical fully assembled system.
Assembly
Failure Rate (FPMH)
MTBF (Hrs)
IP
0.962972
1038452
XFMR
0.371919
2688754
OPA
0.415368
2407499
OPB
0.397808
2513774
OPC
0.398170
2511487
OPD
0.405630
2465300
VCCM600M-AAAA
2.996363
333737.934
To calculate the MTBF of any VCCM system,
Add the FPMH figures for each system component to give the total FPMH.
Get the MTBF by dividing 1,000,000 by the total FPMH.
The variation in FPMH is shown in the graph and table below.
Temp
IP
XFMR
OPA
OPB
OPC
OPD
VCCM600M-ABCD
0
0.41329578
0.127619
0.192619
0.185396
0.186105
0.186243
1.291276945
10
0.54688976
0.178886
0.245347
0.235357
0.235992
0.2362
1.678671789
20
0.72397837
0.255159
0.316147
0.302737
0.30326
0.305183
2.206465072
30
0.96297168
0.371919
0.415369
0.397808
0.39817
0.40563
2.951868534
40
1.29407059
0.555049
0.560829
0.538309
0.538452
0.559393
4.046103211
50
1.76616217
0.846405
0.782692
0.754326
0.754185
0.803972
5.707742381
60
2.46010898
1.315415
1.130884
1.095712
1.095216
1.202005
8.299340054
70
3.50420104
2.067304
1.686039
1.643019
1.642101
1.855247
12.39791075
80
5.09894211
3.266645
2.575169
2.523173
2.52177
2.925702
18.91140128
90
7.55815578
5.160517
3.995269
3.93316
3.931214
4.659641
29.23795696
100
11.3495991
8.112606
6.236851
6.163284
6.160733
7.430093
45.4531658
0
5
10
15
20
25
30
35
40
45
50
0
10
20
30
40
50
60
70
80
90
100
FP
M
H
Baseplate Temperature (
°C)
FPMH Vs Temperature
IP
XFMR
OPA
OPB
OPC
OPD
VCCM600M-ABCD
