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TPS40322RHBT Datasheet(PDF) 29 Page - Texas Instruments |
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TPS40322RHBT Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 47 page  ( ) ( ) ( ) ( ) ( ) OC CS OS min LIM ILIM min V V A 51.05 mV 3 mV 15 V V R 85.3 k 86.6 k I 9.5 A - ´ - - ´ = = = W @ W m ( ) ( ) RIPPLE1 OC OUT1 I 2.5 A V I 1.2 DCR 1.2 10 A 1.2 3.15 m 1.2 51.05 mV 2 2 é ù é ù æ ö æ ö = + ´ ´ ´ = + ´ ´ W ´ = ê ú ê ú ç ÷ ç ÷ è ø è ø ë û ë û ( ) ( ) ( ) ´ = - CS max DCR CS max R13 V R15 V V DCR L1 0.88 H R13 2.8 k C R 0.1 F 3.15 m m = = = W ´ m ´ W OUT1 IN(min) V D V = ( ) ( ) OUT1 RMS cin1 I I D 1 D 10 A 0.15 (1 0.15) 3.57 A = ´ ´ - = ´ ´ - = ( ) RIPPLE(esr) MAX 1 OUT1 RIPPLE1 2 V 50mV ESR 4.44m 11.25 A I I = = = W + ´ OUT1 OUT1 IN1(min) RIPPLE(cap) IN(min) SW I V 10 A 1.2 V C 15 F V V f 200mV 8 V 500kHz ´ ´ = = = m ´ ´ ´ ´ TPS40322 www.ti.com SLUSAF8E – JULY 2011 – REVISED JANUARY 2016 (16) (17) The RMS current in the input capacitors is estimated using Equation 18. (18) (19) To achieve these goals, two 0805, 10-µF capacitors, one 0605, 1.0-µF capacitor and one 0402, 0.1-µF X5R ceramic capacitor are combined at the input. 8.2.1.2.6 MOSFET Selection (Q1) Texas Instruments CSD86330, 20-A power block device was chosen. This device incorporates the high-side and low-side MOSFETs in a single 3 mm x 3 mm package. The high-side MOSFET has an on-resistance (RDS(on)) of 8.8 m Ω, while the low-side on-resistance (RDS(on)) is 4.6 mΩ, both at 4.5 V gate voltage. A 5.11-Ω gate resistor is used on the HDRV pin on each device for added noise immunity. 8.2.1.2.7 ILIM Resistor (R2) The output current is sensed across the DCR of the L1 output inductor. An RC combination having a time constant equal to that of the L1 inductance and the DCR is used to extract the current information as a voltage. A standard capacitor value of 0.1-µF is used. The resistor, R13, can be calculated using Equation 20. (20) A standard 3.09-k Ω resistor was selected. This design limits the maximum voltage drop across the current sense inputs, VCS(max), to 50 mV. If the voltage drop across the DCR of the inductor is greater than VCS(max), after allowing for 20% overshoot spikes and a 20% variation in the DCR value, then a resistor is added to divide the voltage down to 50 mV. The divider resistor, R15, is calculated by Equation 21. where • VDCR = (DCR × 1.2) × (IL(peak) × 1.2) (21) The maximum DCR voltage drop is given by Equation 22. (22) The current limit resistor is calculated using the minimum ILIM programming current, IILIM(min), the maximum current sense amplifier gain, ACS, and assuming a current sense amplifier minimum input offset voltage, VOS(min) equal to –3 mV. (23) Copyright © 2011–2016, Texas Instruments Incorporated Submit Documentation Feedback 29 Product Folder Links: TPS40322 |
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