Transcription of Feedforward Capacitor to Improve Stability and …
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Feedforward Capacitor to Improve Stability and …
CO1 1211 11C =+25 pF2R R R - fffp1 SLVA466A December2011 RevisedJune2017 SubmitDocumentationFeedbackCopyright 2011 2017,TexasInstrumentsIncorporatedFeedfor wardCapacitorto ImproveStabilityand BandwidthWiththe TPS621-Familyand TPS821-FamilyApplicationReportSLVA466A December2011 RevisedJune2017 FeedforwardCapacitorto ImproveStabilityandBandwidthWiththe TPS621-Familyand TPS821-FamilyMatt commonmethodto improvethe stabilityand bandwidthof a powersupplyis to use a feedforwardcapacitor,whichis a capacitorplacedacrossthe zeroand a pole (fZ< fP) to the controlloop,whichcan be strategicallyplacedto improvethe be measuredin boththe transientresponseand bodeplot of the designstrategiesfor placingthe poleand zeroat the optimalfrequencyto improvetransientresponseand circuitstabilityfor the TPS62130/40
60-40 Gain 180-180 Phase 1k Frequency 1M P 1 2 ff 1 = 2 (R // R )C f p Z 1 ff 1 = 2 R C f p Adding Extra Capacitance www.ti.com 2 …
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