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TPA032D01 Datasheet(PDF) 15 Page - Texas Instruments |
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TPA032D01 Datasheet(HTML) 15 Page - Texas Instruments |
15 / 25 page TPA032D01 10W MONO CLASSD AUDIO POWER AMPLIFIER SLOS282B − DECEMBER 1999 − REVISED JUNE 2000 15 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION losses in a real-world class-D amplifier Losses make class-D amplifiers nonideal, and reduce the efficiency below 100%. These losses are due to the output transistors having a nonzero rDS(on), and rise and fall times that are greater than zero. The loss due to a nonzero rDS(on) is called conduction loss, and is the power lost in the output transistors at nonswitching times, when the transistor is on (saturated). Any rDS(on) above 0 Ω causes conduction loss. Figure 8 shows an H-bridge output circuit simplified for conduction loss analysis and can be used to determine new efficiencies with conduction losses included. VDD = 12 V RL 4 Ω 0.36 Ω 0.36 Ω rDS(on) rDS(off) rDS(off) rDS(on) 5 M Ω 5 M Ω Figure 8. Output Transistor Simplification for Conduction Loss Calculation The power supplied, PSUP, is determined to be the power output to the load plus the power lost in the transistors, assuming that there are always two transistors on. Efficiency + h + I2R L I2 2r DS(on) ) I2R L Efficiency + h + P L P SUP Efficiency + h + R L 2r DS(on) ) R L Efficiency + h + 95% at all output levels r DS(on) + 0.1 Ω,R L + 4 Ω Efficiency + h + 85% at all output levels r DS(on) + 0.36 Ω,R L + 4 Ω |
Número de pieza similar - TPA032D01_07 |
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Descripción similar - TPA032D01_07 |
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