SCD401515 Performance Data

SCD401515 Performance Data
Preliminary Reliability Prediction Analysis
For
Power Supply Model: SCD401515
1) INTRODUCTION
This analysis and prediction is based on Part Count Reliability Prediction method as specified in MILHDBK-217F. The component list is based on the schematic diagram of the power supply unit. It must
be understood that reliability prediction is of an estimation and statistical nature and much dependents
on the quality factory of the components being used. In addition, the ambient temp for the MTBF
prediction is based on 300C.
2) RELIABILITY PREDICTION RESULT
A summary of the reliability prediction is given in Table 1.
And the predicted mean time between failure (MTBF): 278,367hrs.
3) COMMENTS
It must be noted that however, the loading is assumed to be at 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.
Thermister
4.
Varistor
4.
Non-Wirewound Variable
πQ
λ EQUIP
Ni
0.0037
0.01
0.0014
0.0029
0.0029
10
10
10
8
8
28
6
1
1
1
1.036
0.6
0.014
0.0232
0.0232
1.
2.
3.
CAPACITOR:
Electrolytic
Ceramic
Metallized Paper / Plastic
0.0013
0.0017
0.0007
10
10
10
9
9
10
0.117
0.153
0.07
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
2
1
1
2
2
0.2016
0.368
0.0448
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
4
0.0174
0.000384
1.
2.
INTEGRATED CIRCUIT:
Linear
Opto Isolator
0.0095
0.027
10
8
3
1
0.285
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
1
0.01
0.044
0.1
0.088
TOTAL EQUIP. FAILURE RATE = 3.592384
MTBF (hrs) =
1 x 106 hrs
--------------------- = 278,367hrs
Total λ EQUIP
LAMBDA SCSeries
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