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TPS54428DDAR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS54428DDAR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 22 page 4.5 to 18 V 1.05 V 4 A 8200 pF TPS54428DDA 1 OUT R1 V = 0.765 1+ R2 æ ö ´ ç ÷ è ø P OUT OUT 1 F = 2 L C ´ p TPS54428 www.ti.com SLVSB42A – NOVEMBER 2011 – REVISED JANUARY 2012 DESIGN GUIDE Step By Step Design Procedure To begin the design process, you must know a few application parameters: • Input voltage range • Output voltage • Output current • Output voltage ripple • Input voltage ripple Figure 15. Schematic Diagram for This Design Example. Output Voltage Resistors Selection The output voltage is set with a resistor divider from the output node to the VFB pin. It is recommended to use 1% tolerance or better divider resistors. Start by using Equation 3 to calculate VOUT. To improve efficiency at very light loads consider using larger value resistors, too high of resistance will be more susceptible to noise and voltage errors from the VFB input current will be more noticeable. (3) Output Filter Selection The output filter used with the TPS54228 is an LC circuit. This LC filter has double pole at: (4) At low frequencies, the overall loop gain is set by the output set-point resistor divider network and the internal gain of the TPS54428. The low frequency phase is 180 degrees. At the output filter pole frequency, the gain rolls off at a –40 dB per decade rate and the phase drops rapidly. D-CAP2™ introduces a high frequency zero that reduces the gain roll off to –20 dB per decade and increases the phase to 90 degrees one decade above the zero frequency. The inductor and capacitor selected for the output filter must be selected so that the double pole of is located below the high frequency zero but close enough that the phase boost provided be the high frequency zero provides adequate phase margin for a stable circuit. To meet this requirement use the values recommended in Table 1. Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s) :TPS54428 |
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