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TPS65321A-Q1 Datasheet(PDF) 31 Page - Texas Instruments |
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TPS65321A-Q1 Datasheet(HTML) 31 Page - Texas Instruments |
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31 / 43 page  BOOT 1 VIN 2 VIN_LDO 3 LDO_OUT 4 FB2 5 RST 6 EN2 7 EN1 RT/CLK SS FB1 COMP GND SW 9 V to 18 V (40 V PK) C51 0.1 F TP_PM1 GND FB1 VIN 1 2 J3 3V3 GND2 1 2 J1 1 2 J2 GND VCAM GND VIO 8 9 10 11 12 13 14 U01 TPS65321QPWPRQ1 10 k VBATT C50 47 …F GND C1 0.1 …F R48 240 k R50 75 k GND 3.3 V at 250 mA C61 10 …F VIN R62 240 k FSW 500 kHz C54 0.01 …F C52 47 nF R56 12 k C53 56 pF FCO 8.7 kHz PM > 80 Degs GM < ±15 dB D800 B340A-13-F GND R57 10 C57 220 pF MSS1048-103MLB TP_SW GND1 R53 51 k FB1 VFB 800 mV R54 360 k GND R55 49.9 L04 33 …F 6V5 6.5 V at 1 A C60 1 F C58 22 F C59 22 F C62 22 F C63 22 F Copyright © 2017, Texas Instruments Incorporated 31 TPS65321A-Q1 www.ti.com SLVSE55 – NOVEMBER 2017 Product Folder Links: TPS65321A-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 8.2.2 Design Example With 500-kHz Switching Frequency R55 is for test purposes only. Figure 23. TPS65321A-Q1 Design Example With 500-kHz Switching Frequency 8.2.2.1 Design Requirements This example begins with the parameters listed in Table 4. Table 4. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Input voltage, VIN1 9 V to 18 V, typical 12 V Output voltage, VREG1 (buck regulator) 6.5 V ± 2% Maximum output current IO_max1 1 A Minimum output current IO_min1 0.01 A Transient response 0.01 A to 1 A 3% Output ripple voltage 1% Switching frequency ƒSW 500 kHz Output voltage, VREG2 (LDO regulator) 3.3 V ± 2% Overvoltage threshold 106% of output voltage Undervoltage threshold 91% of output voltage 8.2.2.2 Detailed Design Procedure For the 500-kHz switching-frequency design, make the adjustments as outlined in the following sections. For sections such as LDO-component calculations, bootstrap-capacitor selection, and others that are not listed in this section, see the 2-MHzSwitching Frequency, 9-V to 16-V Input, 3.3-V Output Buck Regulator, 5-V Output LDO Regulator section. 8.2.2.2.1 Selecting the Switching Frequency For 500-kHz operation, use a 240-kΩ resistor which is calculated using Equation 3. The R62 resistor sets this switching frequency. 8.2.2.2.2 Output Inductor Selection Using Equation 22, the inductor value is calculated as 27.7 μH with KIND = 0.3. This design example can allow for a higher ripple current, therefore, select the nearest standard value of 33 µH. The RMS and peak inductor- current ratings are calculated using Equation 24 and Equation 25 which result in 1.00 A and 1.13 A, respectively. The value of the output-filter inductor must not exceed the RMS-current and saturation-current ratings. |
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