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TPS40322 Datasheet(PDF) 27 Page - Texas Instruments |
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TPS40322 Datasheet(HTML) 27 Page - Texas Instruments |
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27 / 47 page  ( ) ( ) ( ) ( ) ( ) ( ) ( ) 2 2 2 2 2 2 1 1 1 RIPPLE1 OUT1 RIPPLE1 L1 rms L1 avg 12 12 12 I I I I I 10 2.5 10.026 A = + ´ = + ´ = + ´ = IN(max) OUT1 OUT1 OUT1 IN(max) SW V V V 1 15 V 1.2 V 1.2 V 1 L1 0.736 H 0.3 I V f 0.3 10 A 15 V 500kHz - - » ´ ´ = ´ ´ = m ´ ´ TPS40322 www.ti.com SLUSAF8E – JULY 2011 – REVISED JANUARY 2016 Table 4. Design Example 1, Dual-Output List of Materials (continued) REFERENCE QTY DESCRIPTION PART NUMBER MFR DESIGNATOR C13, C14, C30, C31 4 Capacitor, Ceramic, 10 µF, 6.3 V, X7R, ±10%, 0805 Std Std Capacitor, Polymer Aluminum, 220 µF, 4 V, ±20%, 5 m Ω C15, C16, C32, C33 4 EEF-SE0G221ER Panasonic - ECG ESR Capacitor, Ceramic, 220 pF, 50 V, C0G, NP0, ±5%, C17, C23 2 Std Std 0603 C21, C24 2 Capacitor, Ceramic, 10 pF, 50 V, C0G, NP0, ±5%, 0603 Std Std C40 1 Capacitor, Ceramic, 1.0 nF, 25 V, C0G, NP0, ±5%, 0603 Std Std Inductor, Power Choke, 1.1 µH, ±20%, 3.15 m Ω, 7.0 mm L1, L2 2 744314110 Wurth Elektronik x 6.9 mm MOSFET, Synchronous Buck NexFET Power Block, Q1, Q2 2 CSD86330Q3D Texas Instruments QFN-8 POWER R1 1 Resistor, Chip, 68.1 k Ω, 1/10 W, ±1%, 0603 Std Std R2, R21 2 Resistor, Chip, 86.6 k Ω, 1/10 W, ±1%, 0603 Std Std R3 1 Resistor, Chip, 12.7 k Ω, 1/10 W, ±1%, 0603 Std Std R4, R5, R22 3 Resistor, Chip, 1.00 Ω, 1/10 W, ±1%, 0603 Std Std R6 1 Resistor, Chip, 40.2 k Ω, 1/10 W, ±1%, 0603 Std Std R7, R24 2 Resistor, Chip, 49.9 Ω, 1/10 W, ±1%, 0603 Std Std R8, R17 2 Resistor, Chip, 5.11 Ω, 1/8 W, ±1%, 0805 Std Std R9, R16 2 Resistor, Chip, 0 Ω, 1/10 W, ±1%, 0603 Std Std R10, R14, R19, R27 4 Resistor, Chip, 20.0 k Ω, 1/10 W, ±1%, 0603 Std Std R11, R18 2 Resistor, Chip, 82.5 k Ω, 1/10 W, ±1%, 0603 Std Std R12, R23 2 Resistor, Chip, 1.62 k Ω, 1/10 W, ±1%, 0603 Std Std R13 1 Resistor, Chip, 3.09 k Ω, 1/10 W, ±1%, 0603 Std Std R15 1 Resistor, Chip, 29.4 k Ω, 1/10 W, ±1%, 0603 Std Std R20, R30 2 Resistor, Chip, 5.11 Ω, 1/10 W, ±1%, 0603 Std Std R25 1 Resistor, Chip, 10.0 k Ω, 1/10 W, ±1%, 0603 Std Std R26 1 Resistor, Chip, 3.24 k Ω, 1/10 W, ±1%, 0603 Std Std R28, R29 2 Resistor, Chip, 100 k Ω, 1/10 W, ±1%, 0603 Std Std U1 1 TPS40322 Dual Synchronous Buck Controller, QFN-32 TPS40322RHB Texas Instruments 8.2.1.2.1 Selecting a Switching Frequency To maintain acceptable efficiency and meet minimum on-time requirements, a 500-kHz switching frequency is selected. 8.2.1.2.2 Inductor Selection (L1) Synchronous BUCK power inductors are typically sized for approximately 20%–40% peak-to-peak ripple current (IRIPPLE). Given a target ripple current of 30%, the required inductor size, at maximum rated output current, can be calculated using Equation 8. (8) Selecting a standard, readily available inductor, with a rated inductance is 0.88 µH at 10 A, IRIPPLE1 = 2.5 A. The RMS current through the inductor is approximated by the equation: (9) Copyright © 2011–2016, Texas Instruments Incorporated Submit Documentation Feedback 27 Product Folder Links: TPS40322 |
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Similar Description - TPS40322_16 |
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