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AN2811 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN2811 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 25 page AN2811 Design considerations Doc ID 14904 Rev 1 7/25 Figure 3. Modified buck converter For ease in driving Q1 using a conventional buck converter, a modified buck converter has been introduced as shown in Figure 3. Such topology is widely used to drive LEDs. With this modified solution, the MOSFET is no longer floating. In this case the output (Vout) is not connected to ground, and it becomes quite difficult to sense the output current in the output stage directly. Compared to a buck converter, the flyback converter may be the better choice. Figure 4 shows the typical circuit of a flyback converter. Figure 4. Flyback converter The auxiliary winding can be added to the transformer (T1) to provide bias for Q1. Unlike the buck converter, T1 provides isolation between Vin and Vout. Since such isolation is not required for this application, a current sense resistor can be placed across the primary ground and negative polarity of Vout. Thus, Vout shares the same primary ground. In this topology, the MOSFET is not floating. Thanks to VIPer17 the board is built with a high- performance low-voltage controller chip with an 800 V avalanche rugged power MOSFET. Designed with VIPer17, only a few external components are required which allows a smaller profile in the design. |
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