SCS6024 - Datasheet Archive

FOR POWER SUPPLY MODEL: SCS6024 1) INTRODUCTION This report is a summary presentation of the results of reliability analysis of

PRELIMINARY RELIABILITY PREDICTION ANALYSIS FOR POWER SUPPLY MODEL: SCS6024 SCS6024 1) INTRODUCTION This report is a summary presentation of the results of reliability analysis of power supply model SCS6024 SCS6024. The power supply is rated as follows: INPUT OUTPUT 85Vac-265Vac 47Hz-63Hz +24V @ 2.5A 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): 299,788hrs. 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. G ITEM COMPONENT TYPE RESISTOR: 1. Fixed Film 2. Film Power 3. Thermistor 4. Non-Wirewound Variable Q EQUIP Ni 0.0037 0.01 0.0014 0.0029 10 10 10 8 22 5 1 1 0.814 0.5 0.014 0.0232 1. 2. 3. CAPACITOR: Electrolytic Ceramic Metallized Paper / Plastic 0.0013 0.0017 0.0007 10 10 10 6 9 7 0.078 0.153 0.049 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 1 1 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 = 3.157688 MTBF (hrs) = 1 x 106 hrs - = 316,687hrs Total EQUIP LAMBDA SCSeries