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TPS54339DDA Datasheet(PDF) 11 Page - Texas Instruments |
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TPS54339DDA Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page F = P OUT OUT 1 2 L x C p V = 0.765 x OUT R1 1 + R2 æ ö÷ ç ÷ ç ÷÷ çè ø C1 L1 R2 22.1kΩ R1 8.25kΩ C5 0.47μF EN VFB VREG5 SS VIN 4.5 to 23V 10μF C2 C3 10μF 0.1μF 7 5 6 8 VIN VBST SW GND 2 1 3 4 VOUT C6 8200pF PwrPAD 2.2μH 1 C4 U1 TPS54339DDA 9 R3 10.0kΩ C7 0.1μF C8 22μF VOUT C9 22μF VIN 1 Not Installed EN VOUT 1.05V 3A C10 1 TPS54339 www.ti.com SLVSBT2 – JANUARY 2013 DESIGN GUIDE Step-By-Step Design Procedure To begin the design process, the user must know a few application parameters: • Input voltage range • Output voltage • Output current • Output voltage ripple • Input voltage ripple Figure 14. Shows the 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 2 to calculate VOUT. To improve efficiency at light loads consider using larger value resistors, high resistance is more susceptible to noise, and the voltage errors from the VFB input current are more noticeable. (2) Output Filter Selection The output filter used with the TPS54339 is an LC circuit. This LC filter has double pole at: (3) Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS54339 |
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