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ADP3186 Datasheet(PDF) 21 Page - Analog Devices |
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ADP3186 Datasheet(HTML) 21 Page - Analog Devices |
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21 / 24 page  ADP3186 Rev. A | Page 21 of 24 TUNING PROCEDURE To tune the AD3186, follow these steps: 1. Build a circuit based on the compensation values computed from the design spreadsheet. 2. Hook up the dc load to circuit, turn it on, and verify its operation. Also check for jitter at no-load and full-load. DC Loadline Setting 3. Measure the output voltage at no-load (VNL). Verify that it is within tolerance. 4. Measure the output voltage at full-load cold (VFLCOLD). Let the board sit for ~10 minutes at full-load, and then measure the output (VFLHOT). If there is a change of more than a few mV, adjust RCS1 and RCS2 using Equations 35 and 37. () () FLHOT NL FLCOLD NL OLD CS2 NEW CS2 V V V V R R − − × = (35) 5. Repeat Step 4 until the cold and hot voltage measurements remain the same. 6. Measure the output voltage from no-load to full-load using 5 A steps. Compute the loadline slope for each change, and then average them to determine the overall loadline slope (ROMEAS). 7. If ROMEAS is off from RO by more than 0.05 mΩ, use the following to adjust the RPH values: () () O OMEAS OLD PH NEW PH R R R R × = (36) 8. Repeat Steps 6 and 7 to check the loadline, and repeat adjustments, if necessary. 9. Once dc loadline adjustment is complete, do not change RPH, RCS1, RCS2, or RTH for the remainder of the procedure. 10. Measure the output ripple at no-load and full-load with a scope, and make sure that it is within specifications. AC Loadline Setting 11. Remove the dc load from the circuit and hook up the dynamic load. 12. Hook up the scope to the output voltage and set it to dc coupling with the time scale at 100 μs/div. 13. Set the dynamic load for a transient step of about 24 A at 1 kHz with 50% duty cycle. 14. Measure the output waveform (you might have to use dc offset on scope to see the waveform). Try to use a vertical scale of 100 mV/div or finer. This waveform should look similar to Figure 12. 15. Use the horizontal cursors to measure VACDRP and VDCDRP as shown. Do not measure the undershoot or overshoot that happens immediately after the step. 16. If VACDRP and VDCDRP are different by more than a few mV, use Equation 38 to adjust CCS. You might need to parallel different values to get the right one, because the standard capacitor values available are limited. It is a good idea to have locations for two capacitors in the layout for this. () () DCDRP ACDRP OLD CS NEW CS V V C C × = (38) 17. Repeat Steps 11 to 13 and repeat the adjustments, if necessary. Once complete, do not change CCS for the remainder of the procedure. 18. Set the dynamic load step to the maximum step size (do not use a step size larger than needed) and verify that the output waveform is square, which means that VACDRP and VDCDRP are equal. VACDRP VDCDRP Figure 12. AC Loadline Waveform () () ( ) () ( ) () () () () ( ) () () C 25 C 25 C 25 C 25 1 1 ° ° ° ° − − × − + × + = TH TH OLD CS1 NEW CS2 OLD CS1 TH OLD CS1 TH OLD CS1 NEW CS1 R R R R R R R R R R (37) |
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