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L7292 データシート(PDF) 51 Page - STMicroelectronics |
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L7292 データシート(HTML) 51 Page - STMicroelectronics |
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51 / 60 page  DocID028601 Rev 1 51/60 L7292 PCB design rules guideline 60 13 PCB design rules guideline 13.1 Basic principles A step-down converter reduces an incoming voltage to a lower output voltage. A switching element, typically a bipolar or a MOSFET is switched on and off. When the switch is on, the input supply charges the inductor and capacitor and delivers power to the load. During this time, the magnitude of the inductor current ramps up as it flows through the loop 1. When the MOSFET turns off, the input is disconnected from the output, and the inductor and output capacitor support the load. The magnitude of the inductor current ramps down as it flows through the recirculating element, following the direction indicated in the loop 2. The recirculating element can be a diode, but recently a more efficient synchronous rectification system is used where a second switching element takes over the function of the diode. Figure 19. Current loops 13.2 Layout rules A multilayer board is preferred using the top layer to contain all power routing for the devices, and inner layer 1 as a ground return plane. Figure 20. Layer stack |
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