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TPS62052DGSR Datasheet(PDF) 14 Page - Texas Instruments |
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TPS62052DGSR Datasheet(HTML) 14 Page - Texas Instruments |
14 / 30 page I RMS + I O (max) V O V I 1 * V O V I DVO + VO 1 * V O V I L f 1 8 Co f ) R ESR I RMS(Co) + V O 1– V O V I L f 1 2 3 TPS62050, TPS62051, TPS62052, TPS62054, TPS62056 SLVS432F – SEPTEMBER 2002 – REVISED JUNE 2015 www.ti.com Table 3. Inductors (continued) MANUFACTURER TYPE INDUCTANCE DC RESISTANCE SATURATION CURRENT CDR74B 10 µH 70 m Ω 1.65 A CDR74B 22 µH 130 m Ω 1.12 A CDH74 10 µH 49 m Ω 1.8 A CDH74 22 µH 110 m Ω 1.23 A Sumida CDR63B 10 µH 140 m Ω 1 A CDRH4D28 10 µH 128 m Ω 1 A CDRH5D28 10 µH 48 m Ω 1.3 A CDRH5D18 10 µH 92 m Ω 1.2 A DT3316P-153 15 µH 60 m Ω 1.8 A Coilcraft DT3316P-223 22 µH 84 m Ω 1.5 A WE-PD 744 778 10 10 µH 72 m Ω 1.68 A WE-PD 744 777 10 10 µH 49 m Ω 1.84 A Wuerth WE-PD 744 778 122 22 µH 190 m Ω 1.07A WE-PD 744 777 122 22 µH 110 m Ω 1.23 A 10.2.1.2.2 Output Capacitor Selection The output capacitor must have a minimum value of 22 µF. For best performance, a low ESR ceramic output capacitor is needed. For completeness, use Equation 4 to calculate the RMS ripple current. (4) The overall output ripple voltage is the sum of the voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charge and discharging the output capacitor, as shown in Equation 5. (5) The highest output voltage ripple occurs at the highest input voltage VI. 10.2.1.2.3 Input Capacitor Selection Because the buck converter has a pulsating input current, a low ESR input capacitor is required for best input voltage filtering and minimizing the interference with other circuits caused by high input voltage spikes. The input capacitor must have a minimum value of 10 µF and can be increased without any limit for better input voltage filtering. The input capacitor must be rated for the maximum input ripple current calculated as: (6) The worst-case RMS ripple current occurs at D = 0.5 and is calculated as: IRMS = IO/2. Ceramic capacitors have a good performance because of their low ESR value and they are less sensitive to voltage transients compared to tantalum capacitors. Place the input capacitor as close as possible to the input pin of the IC for best performance. 14 Submit Documentation Feedback Copyright © 2002–2015, Texas Instruments Incorporated Product Folder Links: TPS62050 TPS62051 TPS62052 TPS62054 TPS62056 |
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