If yes: change play to something else (that you can still hear of course)
if they're the same, PLAY will not start if you have sibelius already open, and sibelius will give you an error message "audio engine error:bad settings" when it starts up (and if you continue and open "playback decives the sibelius player wont be active (at least it isnt for me)Īre the sibelius and PLAY output settings the same? #2-go into PLAY and make sure under "settings->audio" that your PLAY output device isnt that same as sibelius. if you do have a separate sound card, id suggest setting both to that and then trying again) if that doesnt work, read on (you may want to set your engine to "primary sound driver" if you dont have a separate sound card to make things simpler. #1-check to see if the output of PLAY (soundmapper MME based on your picture) is the same as that of the Sibelius player The consists of the modulator, the external inductor and primary concern at the output is capacitor ESR.Ok, im going to take you on a little logic flowchart for a second, try to follow as best you can. Inductor current is constantly flowing at the output when- In a typical LTC1704 switcher circuit, the feedback loop ever the LTC1704 is operating in Continuous mode. Output of a buck regulator, like the LTC1704’s switcher controller, is much lower than at the input because the The output bypass capacitor has quite different require- ments from the input capacitor. In this case, if the current limit was set to 15A, the inductor should be rated to withstand 15A + 1/2IRIPPLE, orġ7A without saturating. If the data sheet doesn’t give an RMS current rating, chances are the The inductor must not saturate at the expected peak capacitor isn’t surge tested. 1 2 s capacitor, make sure that it is rated to carry the RMS ON QB 5V = µ current that the LTC1704 will draw. 0 5 H µ tantalum capacitors specifically designed for use with I 4A RIPPLE switching regulators. 1 6V) turers are aware of this and sell special “surge tested” L = µ =. The capacitor manufac- t (V ON QB ( ) OUT ) (. to 40% of 10A or 4A, and the inductor value would be: At some random time after they are turned on, they can blow up for no apparent reason. Generic tantalum capacitors have a destruc- L tive failure mechanism when they are subjected to large In our hypothetical 1.6V, 10A example, we’d set the ripple RMS currents (like those seen at the input of an LTC1704). Ripple RIPP 6 RMS current is set by: Tantalum capacitors are a popular choice as input capaci- tors for LTC1704 applications, but they deserve a special t V ON QB OUT IRIPPLE = ( )( ) caution here.
Ewqlso output selection full#
2 2 ) = 4.6 A around 40% of the anticipated full load current. A DCIN 2 sets the ripple current, which is commonly chosen at I = 5 ( 6. I The inductor in a typical LTC1704 circuit is chosen prima- RMSIN = 5 6. electrolytic capacitors in parallel, or with a large mono- lithic ceramic capacitor. This can be met with three 0.014Ω, quirements can be met with multiple low ESR tantalum or 470♟ tantalum capacitors in parallel. For example, to keep the transient response inside with a 10A current step and 5.65ARMS ripple current of 3% with the previous design, we’d need an output ESR capacity to avoid overheating the capacitor. In our example, Usually the solution is to parallel several capacitors at the we need 0.01Ω ESR to keep the input drop under 100mV output. cal 1.6V, 10A switcher with a 0.01Ω ESR output capacitor Generally, a capacitor that meets the first two parameters would experience a 100mV step at the output with a 0A to will have far more capacitance than is required to keep 10A load step-a 6.3% output change! capacitance-based droop under control. As an example, our hypotheti- voltage until the input supply can make up the difference. This ESR step not the same as input RMS current at the input and the at the output is often the single largest budget item in the capacitance must be large enough to maintain the input load regulation calculation. To keep the initial drop as QT turns on within reason across the ESR of the output bypass capacitor until the (100mV or so) its RMS current capability must be ad- feedback loop in the LTC1704 can change the inductor equate to withstand the 4.66A capacitor ripple current is current to match the new load current value.
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