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TPS63021DSJT Datasheet(PDF) 16 Page - Texas Instruments

 No. de Pieza. TPS63021DSJT Descripción HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 4-A SWITCHES Descarga 24 Pages Scroll/Zoom 100% Fabricante TI [Texas Instruments] Página de inicio http://www.ti.com Logo

TPS63021DSJT Datasheet(HTML) 16 Page - Texas Instruments

 16 / 24 page OUTOUTIN1OUTIN1IV(V- V)I1 =+0.82 x Vx f x LOUTOUTIN2 xOUTIN2IN2OUTVx IV(V- V)I2 =+0.8 x V2 x Vx f x LHF×L×10=COUTTPS63020TPS63021SLVS916 – APRIL 2010www.ti.commaximum input voltage. In Equation 3 the minimum inductance, L2, for boost mode operation is calculated. Therecommended minimum inductor value is either L1 or L2, whichever is higher. As an example, a suitable inductorfor generating 3.3V from a Li-Ion battery with a battery voltage range from 2.5V up to 4.2V is 1.5mH. Therecommended inductor value range is between 1.5mH and 4.7mH. This means that at high voltage conversionrates, higher inductor values offer better performance.With the chosen inductance value, the peak current for the inductor in steady state operation can be calculated.Equation 4 shows how to calculate the peak current I1 in step down mode operation and Equation 5 shows howto calculate the peak current I2 in boost mode operation.(4)(5)In both equations, f is the minimum switching frequency. VIN2 is the minimum input voltage. The critical currentvalue for selecting the right inductor is the higher value of I1 and I2 . Consideration must be given to the loadtransients and error conditions that can cause higher inductor currents. This must be taken into account whenselecting an appropriate inductor. The following inductor series from different suppliers have been used withTPS6302x converters:Table 2. List of InductorsVENDORINDUCTOR SERIESCoilcraftXFL4020TokoFDV0530SCAPACITOR SELECTIONInput CapacitorAt least a 10mF input capacitor is recommended to improve transient behavior of the regulator and EMI behaviorof the total power supply circuit. A ceramic capacitor placed as close as possible to the VIN and PGND pins ofthe IC is recommended.Bypass CapacitorTo make sure that the internal control circuits are supplied with a stable low noise supply voltage, a capacitor canbe connected between VINA and GND. Using a ceramic capacitor with a value of 0.1mF is recommended. Thevalue of this capacitor should not be higher than 0.22mF. If no capacitor is used at VINA, VINA should beconnected directly to VIN.Output CapacitorFor the output capacitor, use of small ceramic capacitors placed as close as possible to the VOUT and PGNDpins of the IC is recommended. If, for any reason, the application requires the use of large capacitors which cannot be placed close to the IC, use a smaller ceramic capacitor in parallel to the large capacitor. The smallcapacitor should be placed as close as possible to the VOUT and PGND pins of the IC.To get an estimate of the recommended minimum output capacitance, Equation 6 can be used.(6)A capacitor with a value in the range of the calculated minimum should be used. This is required to maintaincontrol loop stability. There are no additional requirements regarding minimum ESR. There is also no upper limitfor the output capacitance value. Larger capacitors will cause lower output voltage ripple as well as lower outputvoltage drop during load transients.16Submit Documentation FeedbackCopyright © 2010, Texas Instruments IncorporatedProduct Folder Link(s): TPS63020 TPS63021