SCS605 Performance Data

SCS605 Performance Data
PRELIMINARY RELIABILITY PREDICTION ANALYSIS
FOR
POWER SUPPLY MODEL: SCS605
1)
INTRODUCTION
This report is a summary presentation of the results of reliability analysis of power supply model
SCS605.
The power supply is rated as follows:
INPUT
OUTPUT
85Vac-265Vac
47Hz-63Hz
+5V @ 12.0A
This analysis and prediction is based on Part Count Reliability Prediction method as specified in MIL –
HDBK – 217F. The component list is based on the schematic diagram of the power supply unit. It must
be understood that reliability prediction is an estimation and statistical nature and much dependent on
the quality factory of the components being used. In addition, the ambient temp for the MTBF
prediction is based on 30oC.
2)
RELIABILITY PREDICTION RESULT
A summary of the reliability prediction is given in Table 1.
And the predicted mean time between failure (MTBF): 291,742hrs.
3)
COMMENTS
It must be noted that however, the loading is assumed to be a t worst case and 100% duty cycle for all
components, together with fact that the quality factors for most of the components are estimated rather
conservatively. In practice, therefore, the MTBF (hrs) can be expected to be higher than this calculated
figures.
LAMBDA SCSeries
MTBF CALCULATION
TABLE 1.
λG
ITEM COMPONENT TYPE
RESISTOR:
1.
Fixed Film
2.
Film Power
3.
Thermistor
4.
Non-Wirewound Variable
πQ
λ EQUIP
Ni
0.0037
0.01
0.0014
0.0029
10
10
10
8
23
7
1
1
0.851
0.7
0.014
0.0232
1.
2.
3.
CAPACITOR:
Electrolytic
Ceramic
Metallized Paper / Plastic
0.0013
0.0017
0.0007
10
10
10
8
9
8
0.104
0.153
0.056
1.
2.
3.
4.
5.
6.
7.
SEMICONDUCTOR:
Diode, General Purpose
Diode, Fast Recovery Pwr. Rectifier
Diode, Power Rectifier Schottky Pwr.
Zener Diode, General Purpose
Si Power MOSFET
SCR
Transistors
0.0036
0.023
0.0028
0.0033
0.014
0.0025
0.00015
8
8
8
8
8
8
8
7
2
1
1
1
2
2
0.2016
0.368
0.0224
0.0264
0.112
0.04
0.0024
1.
2.
INDUCTIVE PARTS:
Transformer, Flyback
Coil, Fixed Inductor or Choke
0.0058
0.000032
3
3
1
3
0.0174
0.000288
1.
2.
INTEGRATED CIRCUIT:
Linear
Opto Isolator
0.0095
0.027
10
8
2
1
0.19
0.216
1.
2.
3.
4.
OTHERS:
Fuse
Printed Wire Board
I/P Connector
PCB Connector
0.010
0.022
0.050
0.044
N/A
2
2
2
1
1
1
2
0.01
0.044
0.1
0.176
TOTAL EQUIP. FAILURE RATE = 3.427688
MTBF (hrs) =
1 x 106 hrs
--------------------- = 291,742hrs
Total λ EQUIP
LAMBDA SCSeries
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