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TPA032D01 Datasheet(PDF) 18 Page - Texas Instruments |
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TPA032D01 Datasheet(HTML) 18 Page - Texas Instruments |
18 / 25 page TPA032D01 10W MONO CLASSD AUDIO POWER AMPLIFIER SLOS282B − DECEMBER 1999 − REVISED JUNE 2000 18 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION class-D EVM power supply decoupling data The decoupling capacitance required will depend upon the application. Pads and through-holes have been provided on the EVM for the addition of bulk capacitance (see the schematic). A plot showing the impact of various levels of bulk capacitance on the voltage ripple on the power supply line is shown in Figure 11. This ripple is maximum at higher frequency. The figure shows worst-case voltage ripple for a 20-kHz, 10-W output into a 4- Ω load. In all cases, two 10-µF and one 1-µF ceramic chip capacitors were decoupling the power supply signal from the EVM. The 1- µF unit was placed immediately adjacent to the IC power pins, and the 10-µF units were placed adjacent to each other a little farther out. The upper trace shows the ripple when only these capacitors are used. The middle trace shows the impact of an additional 330- µF aluminum electrolytic capacitor rated at 25 V, 90 mΩ, and for 755 mA at 100 kHz. In the bottom trace, the 330- µF capacitor was replaced by a 390-µF aluminum electrolytic capacitor rated at 35 V, 65 m Ω, and for 1.2 A of 100 kHz ripple current. The results indicate that for sensitive circuits where minimum voltage ripple is required, a larger bulk capacitance with low ESR should be used. For systems that are contained and EMI is controlled, less capacitance may be used. The difference in the level of distortion in the output signal was very small between each level of decoupling, with the 20- µF bulk capacitance providing the least distortion. This is attributed to the low ESR of the capacitor, which is only a few milliohms at the switching frequency of 250 kHz. The distortion is made lower still by the parallel combination. Distortion of the output signal when only one 10- µF capacitor is used is the same as for 20 µF. The difference is more noticeable on the power supply line, though the distortion is increased only slightly more than with the 20- µF capacitor. RIPPLE VOLTAGE Time (10 µsec per division) Figure 11. Power Supply Decoupling |
Número de pieza similar - TPA032D01_07 |
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Descripción similar - TPA032D01_07 |
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