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PAM8603M Datasheet(PDF) 11 Page - Power Analog Micoelectronics |
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PAM8603M Datasheet(HTML) 11 Page - Power Analog Micoelectronics |
11 / 14 page Over Temperature Protection How t o Reduce EMI (Electro Magnetic Interference) PCB Layout Guidelines Grounding Thermal protection on the PAM8603M prevents the device from damage when the internal die temperature exceeds 135°C. There is a 15 degree tolerance on this trip point from device to device. Once the die temperature exceeds the thermal set point, the device outputs are disabled. This is not a latched fault. The thermal fault is cleared once the temperature of the die is reduced by 30 . This large hysteresis will prevent motor boating sound well. The device begins normal operation at this point without external system interaction. A simple solution is to put an additional capacitor 1000 F at power supply terminal for power line coupling if the traces from amplifier to speakers are short (<20cm). Most applications require a ferrite bead filter as shown at Figure 3. The ferrite filter reduces EMI of around 1 MHz and higher. When selecting a ferrite bead, choose one with high impedance at high frequencies, and low impedance a t low frequencies (MH2012HM221-T). Figure 3: Ferrite Bead Filter to Reduce EMI At this stage it is paramount to notice the necessity of separate grounds. Noise currents in the output power stage need to be returned to output noise ground and nowhere else. Were these currents to circulate elsewhere, they may get into the power supply, the signal ground, etc, even worse, they may form a loop and radiate noise. Any of these cases results in degraded amplifier performance. The logical returns for the output noise currents associated with Class-D switching are the respective PGND pins for each channel. The switch state diagram illustrates that PGND is instrumental in nearly every switch state. This is the perfect point to which the output noise ground trace should return. Also note that output noise ground is channel specific. A two- channel amplifier has two seperate channels and consequently must have two seperate output noise ground traces. The layout of the PAM8603M offers separate PGND connections for each channel and in some cases each side of the bridge. Output noise grounds must be tied to system ground at the power exclusively. Signal currents for the inputs, reference, etc need to be returned to quite ground. This ground is only tied to the signal components and the GND pin, and GND then tied to system ground. μ °C 11 10/2008 Rev 1.0 200pF 200pF OUT+ OUT- Ferrite Bead Ferrite Bead , Power Analog Microelectronics Inc www.poweranalog.com PAM8603M 3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control |
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