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PAM8403 Datasheet(PDF) 10 Page - Power Analog Micoelectronics |
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PAM8403 Datasheet(HTML) 10 Page - Power Analog Micoelectronics |
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10 / 12 page  Under Voltage Lock-out (UVLO) Short Circuit Protection (SCP) How t o R educe EMI (Electro Magnetic Interference) The PAM8403 incorporates circuitry designed to detect low supply voltage. When the supply voltage drops to 2.0V or below, the PAM8403 outputs are disabled, and the device comes out of this state and starts to normal function when V 2.2V. The PAM8403 has short c ircuit protection circuitry on the outputs to prevent damage to the device when output-to-output or output-to-GND short occurs. When a short circuit is detected on the outputs, the outputs a re disabled immediately. If the short was removed, the device activates again. 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 in Figure 2. 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 at low frequencies. DD ≥ μ Over Temperature Protection Thermal protection on the PAM8403 prevents the device from damage when the internal die temperature exceeds 140°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 and the device begins normal operation at this point without external system intervention. Figure 2: Ferrite Bead Filter to reduce EMI °C 10 PAM8403 Filterless 3W Class-D Stereo Audio Amplifier 09/2008 Rev 1.3 , Power Analog Microelectronics Inc www.poweranalog.com 220pF 220pF OUT+ OUT- Ferrite Bead Ferrite Bead |
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