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## MIC21LV32 Datasheet(PDF) 22 Page - Microchip Technology

 Part No. MIC21LV32 Description 36V Dual Phase, Advanced COT Buck Controller Stackable for Multiphase Operation Download 50 Pages Scroll/Zoom 100% Manufacturer MICROCHIP [Microchip Technology] Direct Link http://www.microchip.com Logo

## MIC21LV32 Datasheet(HTML) 22 Page - Microchip Technology

 22 / 50 pageMIC21LV32DS20006513A-page 22 2021 Microchip Technology Inc.4.4Ripple Injection CircuitComponents SelectionFollow the steps below for selecting the ripple injectioncircuit components if low-ESR output capacitors are used.The below procedures provide a good starting point forselecting the ripple injection components. Final valuesshould be confirmed by laboratory measurements.1.Calculate the product of RINJ and CFF for a giveninjected Feedback Ripple Voltage, ΔVFB, usingthe equation below. Choose ΔVFB in the range of40 mV to 500 mV. A good starting point for ΔVFBis 50 mV.EQUATION 4-4:2.Choose CFF in the range of 0.47 nF to 10 nF.3.Calculate RINJ using the equation above.4.Calculate the Top Feedback Resistor, RFB(TOP),value using the equation below:EQUATION 4-5:5.Calculate Bottom Feedback Resistor, RFB(BOT),value using the equation below:EQUATION 4-6:6.Estimate the crossover frequency using theequation below. If fCO(EST) is above fSW/5, lowerthe CFF value and repeat procedure 6.EQUATION 4-7:7a) Select CINJ using the below equation if fCO(EST)calculated above meets Equation 5-11.EQUATION 4-8:Add a resistor in parallel with the soft start capacitor con-nected to the SS pin if CINJ > CFF × (RFB(TOP)/RFB(BOT)).This ensures that there is no overshoot at the end of thesoft start. Use Equation 4-9 below to select the parallelresistor value.EQUATION 4-9:7b) Select CINJ using the below guidelines iffCO(EST) is low (typically below fSW/15).Calculate the maximum Equivalent SeriesResistance (ESR) of the output capacitor usingEquation 4-10.EQUATION 4-10:Calculate the output capacitance using Equation 4-11.EQUATION 4-11:Calculate CINJ using Equation 4-12.EQUATION 4-12:Using too low a CINJ may result in oscillations at thebeginning of the soft start. These oscillations can bereduced either by using a higher CINJ or COUT, byreducing the feedback ripple.Where:ΔVFB = Injected Feedback Ripple VoltageRINJ × CFF =500VFBWhere:fLC = LC Resonant Frequency = 1/(2 xx sqrt(L x COUT)RFB(TOP) ≥12 × π × CFF × 0.8 × fLCWhere:VOUT = Target Output VoltageVREF = Reference Voltage = 0.6V for MIC21LV32RFB(BOT) =RFB(TOP)VOUTVREF– 1[]Where:L = InductanceCOUT = Output CapacitanceVOUT = Output VoltagefSW = Switching FrequencyfCO(EST) =RINJ × CFFπ × L × COUTVOUT × 106fSW×CINJ ≥10.8 × RINJ × fCO(EST)Where:ISS = Soft Start Current Source = 1.2 µARSS ≥0.8VISSWhere:ΔILOAD_STEP = Magnitude of the Load TransientΔVOUT_TRANS = Acceptable Output Voltage Deviationduring Load TransientESRCOUT ≤VOUT_TRANSILOAD_STEPCOUT ≥1π × fCO × ESRCOUTCINJ = CFF ×ESRCOUT2 × π × fCO × LVOUT5V × 100 ns × fSW×

## Similar Part No. - MIC21LV32

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## Similar Description - MIC21LV32

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