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TPS54110 Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS54110 Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 30 page ( ) 2 1 12 2 OUT IN(MAX) OUT L(RMS) OUT(MAX) IN(MAX) OUT SW V V V I I V L F 0.8 ´ - æ ö = + ´ ç ÷ ´ ´ ´ è ø OUT IN(MAX) OUT L(PK) OUT(MAX) OUT IN(MAX) SW V (V -V ) I I 1.6 V L F ´ = + ´ ´ ´ OUT MIN OUT CO K C L 2 ( ) æ ö 1 = ´ ç ÷ 2p¦ è ø ) OUT IN(MAX) OUT COUT(RMS) IN(MAX) OUT SW C 1 V (V V I V L F N 12 ´ - é ù = ´ ê ú ´ ´ ´ ë û ( ) æ ö ´ ´ ´ ´ ´ D ç ÷ ç ÷ ´ è ø IN(MAX) OUT SW MAX C p-p(MAX) OUT IN(MAX) OUT V L F 0.8 ESR =N V V V -V TPS54110 SLVS500C – DECEMBER 2003 – REVISED FEBRUARY 2011 www.ti.com (5) The peak inductor current is determined from Equation 6: (6) For this design, the RMS inductor current is 1.503 A and the peak inductor current is 1.673 A. The inductor chosen is a Coilcraft DS3316P-682 6.8 µH. It has a saturationcurrent rating of 2.8 A and an RMS current rating of 2.2 A, easily meeting these requirements. Capacitor Selection The important design parameters for the output capacitor are dc voltage, ripple current, and equivalent series resistance (ESR). The dc-voltage and ripple-current ratings must not be exceeded. The ESR rating is important because along with the inductor current it determines the output ripple voltage level. The actual value of the output capacitor is not critical, but some practical limits do exist. Consider the relationship between the desired closed-loop crossover frequency of the design and LC corner frequency of the output filter. In general, it is desirable to keep the closed-loop crossover frequency at less than 1/5 of the switching frequency. With high switching frequencies such as the 700 kHz frequency of this design, internal circuit limitations of the TPS54110 limit the practical maximum crossover frequency to about 100 kHz. To allow adequate phase gain in the compensation network, set the LC corner frequency to approximately one decade below the closed-loop crossover frequency. This limits the minimum capacitor value for the output filter to: (7) where K is the frequency multiplier for the spread between fLC and fCO. K should be between 5 and 15, typically 10 for one decade of difference. For a desired crossover of 60 kHz, K=10 and a 6.8 μH inductor, the minimum value for the output capacitor is 100 μF. The selected output capacitor must be rated for a voltage greater than the desired output voltage plus one half the ripple voltage. Any derating factors must also be included. The maximum RMS ripple current in the output capacitor is given by Equation 8: (8) where NC is the number of output capacitors in parallel. The maximum ESR of the output capacitor is determined by the allowable output ripple specified in the initial design parameters. The output ripple voltage is the inductor ripple current times the ESR of the output filter so the maximum specified ESR as listed in the capacitor data sheet is given by Equation 9: (9) For this design example, a single 100 µF output capacitor is chosen for C2. The calculated RMS ripple current is 80 mA and the maximum ESR required is 87 m Ω. An example of a suitable capacitor is the Sanyo Poscap 6TPC100M, rated at 6.3 V with a maximum ESR of 45 milliohms and a ripple-current rating of 1.7 A. Other capacitor types work well with the TPS54110, depending on the needs of the application. Compensation Components The external compensation used with the TPS54110 allows for a wide range of output-filter configurations. A large range of capacitor values and dielectric types are supported. The design example uses type 3 compensation consisting of R1, R3, R5, C6, C7 and C8. Additionally, R2 and R1 form a voltage-divider network that sets the output voltage. These component reference designators are the same as those used in the SWIFT Designer Software. 10 Submit Documentation Feedback © 2003–2011, Texas Instruments Incorporated Product Folder Link(s): TPS54110 |
Numéro de pièce similaire - TPS54110_15 |
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Description similaire - TPS54110_15 |
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