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PAM8006HR Datasheet(PDF) 9 Page - Power Analog Micoelectronics |
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PAM8006HR Datasheet(HTML) 9 Page - Power Analog Micoelectronics |
9 / 15 page 9 , Power Analog Microelectronics Inc PAM8006 10W Stereo Class-D Audio Power Amplifier www.poweranalog.com Application Information Power and Heat Dissipation Choose speakers that are able to stand large output power from the PAM8006. Otherwise, speaker may suffer damage. In operation, some of power is dissipated to the resistors. The PAM8006’ s efficiency is 90% with 10W ouput and 8 load. The dissipation power is 2.22W. Thermal resistance of junction to ambient of the QFN package is 18.1°C/W and the junction temperature Tj=P * jA+Ta, where Ta is ambient temperature. If the ambient temperature is 85°C, the QFN’ s junction temperature Tj=2.22*18.1+85=125°C w h i c h is l o w e r t h a n 1 5 0 °C r a t e d j u n c t i o n temperature. If the rated workable junction temperature is 1 5 0 °C , t h e r e l a t i o n s h i p b e t w e e n a m b i e n t temperature and permitted P is shown in below diagram. From the diagram, it can be found that when the device works at 10W/8 load the dissipation power is 1.1W per channel, 2.2W total, the permitted ambient temperature is over 100°C. This is proven by actual test. The PAM8006 can work in full output power under 85°C ambient temperature. Ω θ Ω loss loss Heat dissipation is very important when the device works in full power operation. Two factors affect the heat dissipation, the efficiency of the device that determines the dissipation power, and the thermal resistance of the package that determines the heat dissipation capability. Power Dissipation: P =(Po*(1- 2 loss η)/ η)* 0 1 2 3 4 5 6 7 8 9 10 0 20 40 60 80 100 Ta Notes 1. The Audio Precision(AP) AUX-0025 low pass filter is necessary for class-D amplifier measurement with AP analyzer. 2. Two 22µH inductors are used in series with load resistor to emulate the small speaker for effic iency measurement. Test Setup for Performance Testing (AP) System Generator PAM8006 Demo Board +OUT Input Load AP Low Pass Filter AUX-0025 AP System Analyzer GND -OUT VDD Power Supply 03/2011 Rev1.0 Audio Precision |
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