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TPS40322 Datasheet(PDF) 21 Page - Texas Instruments |
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TPS40322 Datasheet(HTML) 21 Page - Texas Instruments |
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21 / 40 page  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 500 kHz - - » ´ ´ = ´ ´ = m ´ ´ TPS40322 www.ti.com SLUSAF8 – JUNE 2011 TPS40322 Design Example 1 Dual-Output Configuration from 12-V Nominal to 1.2-V and 1.8-V DC-to-DC Converter Using the TPS40322 The following example illustrates the design process and component selection for a dual output synchronous buck converter using the TPS40322 controller. The design goal parameters are listed in Table 2. Table 2. TPS40322 Dual Output Design Example Specification PARAMETER TEST CONDITION MIN NOM MAX UNIT INPUT CHARACTERSTICS VIN Input voltage 8 12 15 V VIN(ripple) Input ripple IOUT1 = IOUT2 = 10 A 0.25 V OUTPUT 1 CHARACTERSTICS VOUT1 Output voltage IOUT1(min) ≤ IOUT1 ≤ IOUT1(max) 1.2 V Line regulation VIN(min) ≤ VIN ≤ VIN(max) 0.5% Load regulation IOUT1(min) ≤ IOUT1 ≤ IOUT1(max) 0.5% VRIPPLE1 Output ripple IOUT1 = IOUT1(max) 24 mV VOVER1 Output overshoot ΔIOUT1 = 5 A 40 mV VUNDER1 Output undershoot ΔIOUT1 = 5A 40 mV IOUT1 Output current VIN(min) ≤ VIN ≤ VIN(max) 0 10 A ISCP1 Short circuit current trip point 15 A OUTPUT 2 CHARACTERSTICS VOUT2 Output voltage IOUT2(min) ≤ IOUT2 ≤ IOUT2(max) 1.8 V Line regulation VIN(min) ≤ VIN ≤ VIN(max) 0.5% Load regulation IOUT2(min) ≤ IOUT2 ≤ IOUT2(max) 0.5% VRIPPLE2 Output ripple IOUT2 = IOUT2(max) 36 mV VOVER2 Output overshoot ΔIOUT2 = 5 A 40 mV VUNDER2 Output undershoot ΔIOUT2 = 5 A 40 mV IOUT2 Output current VIN(min) ≤ VIN ≤ VIN(max) 0 10 A ISCP2 Short circuit current trip point 15 A GENERAL CHARACTERSTICS tSS Soft-start time VIN = 12 V 2 ms η Efficiency VIN = 12 V, IOUT1= IOUT2 = 10 A 88% fSW Switching frequency 500 kHz Design Procedure Equations and calculations are shown regarding VOUT1. VOUT2 values can be calculated using similar equations. Selecting a Switching Frequency To maintain acceptable efficiency and meet minimum on-time requirements, a 500kHz switching frequency is selected. 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 Copyright © 2011, Texas Instruments Incorporated 21 |
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