tailieunhanh - PCB Layout Guidelines for Power Controllers

To help you Specialized Information Technology document further serve the needs of learning and research, invite you to consult the document content, "PCB Layout Guidelines for Power Controllers" below. Hope content useful document serves the academic needs and research. | Texas Instruments Application Report SLUA366-October 2005 PCB Layout Guidelines for Power Controllers Bob Kando PMP - Systems Power MAN 1 Scope Power layouts require a few basic rules. This guideline for power controller layout addresses The supply of sufficient current to the load. Noise immunity for the load and sense circuits. Accurate current sensing. Reference the controller datasheet for helpful applications information such as component selection set point calculations and thermal considerations. The power controller datasheet may have specific bypass capacitor information. Other times it may be necessary to perform system measurements and tests to determine the optimum bypass values. Treatment of other high frequency system signals such as clocks are not discussed here and usual good practice rules for layout and manufacturability apply. 2 Description General The power controller MOSFET and sense resistor operate together to deliver power to the slot. These components should be located together at the slot. The sense resistor is sized to select the current supplied on a given slot voltage. Because of the tolerance on the controllers comparator input voltage the circuit design and layout must consider the high end of the current range for etch runs and vias. A circuit that is design for 12 A minimum often supplies current to a maximum of 18 A. Use 18 A for all the etch and via calculations. PCB Etch Table 1 is helpful to determine the current carrying capacity of PCB etches. The table assumes 1oz sq foot copper thickness . 10 C rise on outer layers 20 C inner layers Groups of high current tracks are de-rated Tracks are not near or over heat sink areas Table 1. Current Capacity PCB Etch WIDTH CURRENT CAPACITY A A A A A SLUA366-October 2005 PCB Layout Guidelines for Power Controllers 1 Texas Instruments Description From Table 1 each doubling of copper thickness allows an increase of .

• Kỹ thuật lập trình
• PCB Layout Guidelines
• Power Controllers
• Bulk Capacitance
• Supply Bypass
• Sense Resistor Bypass
• Sense Resistor Wiring
• ngành điện tử
• điện cơ điện tử
• kỹ thuật điện
• công nghệ điện tử
• cách mạch điện tử