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ADP3203JRU-085-RL Arkusz danych(PDF) 11 Page - Analog Devices |
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ADP3203JRU-085-RL Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 12 page ADP3203 REV. PrD –11– PRELIMINARY TECHNICAL DATA near the MOSFETs will help. Even just small airflow can help tremendously. Paralleled MOSFETs to achieve a given resistance will help spread the heat. 6. An external "antiparallel" schottky diode (across the bottom MOSFET) may help efficiency a small amount (< ~1 %) depending on its forward voltage drop com- pared to the MOSFET's body diode at a given current; a MOSFET with a built in antiparallel schottky is more effective. For an external schottky, it should be placed next to the bottom MOSFET or it may not be effective at all. 7. The VCC bypass capacitor should be close to the VCC pin and connected on either a very short trace to the GND pin or to the GND plane. Output Filter Output Inductor and Capacitors, Current Sense Resistor 8. Locate the current sense resistors very near to the output voltage plane. 9. The load-side heads of two sense resistors should join as closely as possible for accurate current signal measure- ment of each phase. 10. PCB trace resistances from the current sense resistors to the regulation point should be minimized, known (calculated or measured), and compensated for as part of the design if it is significant. (Remote sensing is not sufficient for relieving this requirement!) A square section of 1-ounce copper trace has a resistance of ~500 m Ω and this adds to the specified DC output resistance of the power converter. The output capaci- tors should similarly be close to the regulation point and well tied into power planes as impedance here will add to the "AC output resistance" (i.e., the ESR) that is implicitly specified as well. 11. Whenever high currents must be routed between PCB layers, vias should be used liberally to create parallel current paths so that the resistance and inductance is minimized and the via current rating is not exceeded. Control Circuitry ADP3203, Control Components 12. If the ADP3203 cannot be placed as previously recom- mended, at the least care should be taken to keep the device and surrounding components away from radia- tion sources (e.g., from power inductors) and capacitive coupling from noisy power nodes. 13. Noise immunity can be improved by the use of a devoted signal ground plane for the power controller and its surrounding components. Space for a ground plane might readily be available on a signal plane of the PCB since it is often unused in the vicinity of the power controller. 14. If critical signal lines (i.e., signals from the current sense resistor leading back to the ADP3203) must cross through power circuitry, it is best if a signal ground plane can be interposed between those signal lines and the traces of the power circuitry. This serves as a shield to minimize noise injection into the signals. 15. Absolutely avoid crossing any signal lines over the switching power path loop, described previously. 16. Accurate voltage positioning depends on accurate current sensing, so the control signals which monitor the voltage differentially across the current sense resistor should be kelvin connected. Please refer to ADI Evalua- tion Board of the ADP3203 and its documentation for control signal connection with sense resistors. 17. The RC filter used for the current sense signal should be located near the control components as this serves the dual purpose of filtering out the effect of the current sense resistors' parasitic inductance and noise picked up along the routing of the signal. The former purpose is achieved by having the time constant of the RC filters approximately matched to that of the sense resistors and is important for maintaining the accuracy of the current signal. TABLE 1. VID CODE VID4 VID3 VID2 VID1 VID0 VOUT 0 0 0 0 0 1.750 0 0 0 0 1 1.700 0 0 0 1 0 1.650 0 0 0 1 1 1.600 0 0 1 0 0 1.550 0 0 1 0 1 1.500 0 0 1 1 0 1.450 0 0 1 1 1 1.400 0 1 0 0 0 1.350 0 1 0 0 1 1.300 0 1 0 1 0 1.250 0 1 0 1 1 1.200 0 1 1 0 0 1.150 0 1 1 0 1 1.100 0 1 1 1 0 1.050 0 1 1 1 1 1.00 1 0 0 0 0 0.975 1 0 0 0 1 0.950 1 0 0 1 0 0.925 1 0 0 1 1 0.900 1 0 1 0 0 0.875 1 0 1 0 1 0.850 1 0 1 1 0 0.825 1 0 1 1 1 0.800 1 1 0 0 0 0.775 1 1 0 0 1 0.750 1 1 0 1 0 0.725 1 1 0 1 1 0.700 1 1 1 0 0 0.675 1 1 1 0 1 0.650 1 1 1 1 0 0.625 1 1 1 1 1 0.600 |
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