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AN2025 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN2025 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 11 page AN2025 - APPLICATION NOTE 9/11 The two method of optimization of conventional parts numbers are given in the table below: In this example, avalanche losses and switching-off losses are negligible in comparison with the forward losses. The following table gives the forward losses saving for each output. In this example, the total efficiency improvement on the 3 outputs is equal to 1.9%. VI. Conclusion This paper presents the specification tool allowing the admissible avalanche power of Schottky diodes to be calculated. With this tool and the simple method to estimate the maximum avalanche peak power, one can easily determine if a given Schottky diode can work in the avalanche area. In SMPS, the efficiency drop is mainly determined by the rectification diode stage. In most of cases and according to the converter topology, the use of Schottky diodes in the avalanche area will allow the converter's efficiency to be improved. Alternatively it can enable the cost to be optimized by reducing the current rating of the rectification diode. References: [1] AN1453: NEW FAMILY OF 150V POWER SCHOTTKY (by F.Gautier) [2] AN587: TRANSISTOR PROTECTION BY TRANSIL( by B.Rivet) [3] ANALYSIS AND OPTIMISATION OF HIGH FREQUENCY POWER RECTIFICATION (by J.M.Peter) Figure 15: SMPS for PC 3.3V 10A 5V 25A 12V 10A STPS3045CT STPS6045CW STPS20H100CT Part Number VOUT Current solution Power losses saving sol. Cost saving solution 3.3 V STPS3045CT STPS3030CT STPS2030CT 5 V STPS6045CW STPS6030CW STPS3030CT 12 V STPS20H100CT STPS20L60CT STPS10L60CT Output Part Number Pfwd (W) VOUT = 3.3 V IOUT = 10 A STPS3045CT 4.35 STPS3030CT 3.12 VOUT = 5 V IOUT = 25 A STPS6045CW 12 STPS6030CW 9.1 VOUT = 12 V IOUT = 10 A STPS20H100CT 5.85 STPS20L60CT 4.66 |
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