7)Use the following formulas to calculate the efficiency: Efficiency= (Pout/Pin) × 100(%)
Pin = Iin × Vin Pout = Iout × Vout
The following graph shows the efficiency results of the S48SS/S48SR converters measured at different operating points.
(%) | 90 |
|
|
|
|
|
|
|
|
EFFICIENCY | 85 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
| 80 |
|
|
|
|
|
|
|
|
| 75 |
|
|
|
|
|
|
|
|
| 70 |
|
|
|
|
|
|
|
|
| 65 |
|
|
|
|
|
|
|
|
| 60 |
|
|
|
|
|
| 36Vin |
|
|
|
|
|
|
|
|
|
| |
| 55 |
|
|
|
|
|
| 48Vin |
|
|
|
|
|
|
|
| 75Vin |
| |
| 50 |
|
|
|
|
|
|
|
|
| 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 |
OUTPUT CURRENT (A)
Appendix A- Evaluation Board Schematic
|
| COPPER | SVin+ |
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
VIN+ | L1 |
|
|
|
| VIN+ | VOUT+ |
|
|
|
|
|
|
|
| VOUT+ |
| NC |
|
| BNC1 |
|
|
|
|
|
|
|
|
|
|
| BNC2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
C2 |
|
|
| C3 |
|
| TRIM | C102 | C103 | C104 | C107 | C108 | C109 | C110 | C105 | C106 |
NC |
|
|
| 68u/100V |
|
| C101 | |||||||||
|
|
|
|
|
|
| NC | NC | NC | NC | NC | NC | NC | NC | 1u/25V 10u/25V | |
VIN- |
|
|
|
|
| VIN- | VOUT- |
|
|
|
|
|
|
|
| VOUT- |
|
|
|
| SVin- |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| J2NC |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| J3 |
|
|
|
|
|
|
|
|
|
NC | R1 |
|
| R3 |
| VR1 | 0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
| SW1 |
| NC |
| 100K |
|
|
|
|
|
|
|
|
|
|
|
| Hi 1 Floating ON/OFF |
| DOWN |
|
|
|
|
|
|
|
|
|
| ||
|
| NC | 2 |
|
| 3 |
|
|
|
|
|
|
|
|
|
|
NC | ZD1 |
| SW2 | 2 OFF |
|
|
|
|
|
|
|
|
|
| ||
Low 3 | NC C1 |
| 1 |
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
| UP |
|
|
|
|
|
|
|
|
|
|
|
|
|
| R2 |
| VR2 | J1NC |
|
|
|
|
|
|
|
|
|
|
|
|
| NC |
| 100K |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| J4 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 0 |
|
|
|
|
|
|
|
|
|
10
