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YDA131-EZ View Datasheet(PDF) - Yamaha Corporation

 Part Name Description Manufacturer YDA131-EZ STEREO 2.5W DIGITAL AUDIO POWER AMPLIFIER Yamaha Corporation YDA131-EZ Datasheet PDF : 18 Pages
 1 2 3 4 5 6 7 8 9 10 Next Last YDA131 If power supply voltage changes exceeding 10% in a very short period, this IC may go into mute state internally due to the pop moise reduction function described before. Therefore, it is recommended to use this IC in normal operation so that the change of power supply voltage in a very short period wouldn't exceed 10%. This IC may also go into mute state internally when the power supply voltage is reduced temporarily below 3.0V. Therefore, it is recommended to use this IC in normal operation so that the power supply voltage wouldn't fall below 3.0V. ●Power consumption This IC is capable of outputting up to 5W in total, or 2.5W per one channel. Digital amplifiers can be used without heat sink because their operation efficiency is higher than conventional linear amplifiers. When using this IC, ensure that the power consumption does not exceed the maximum allowable loss that is defined as the absolute maximum rating. The power consumption of this device can be obtained by using "Formula 5". In the following formula, PD represents the power consumption, Po represents average output power, RL represents the output load impedance, and Pic represents the internal control circuit loss. Formula 5: PD(W) = Po(W) * 1.05 / RL(Ω) + Pic(W) Pic = 0.09W (VDD=5.0V) Pic = 0.04W (VDD=3.3V) The maximum allowable loss PDmax is obtained by using "Formula 6" based on the absolute maximum rating of the junction temperature of this IC. In the following formula, Tjmax represents the absolute maximum rating of the junction temperature, θja represents thermal resistance of SSOP24 package, and Ta represents the ambient temperature. Formula 6: PDmax(W) = (Tjmax(°C) - Ta(°C)) / θja θja = 96.7°C/W Tjmax = 125°C For example, when VDD=5.0V, output load=4Ω, and 2.5W * 2ch is outputted continuously, the maximum allowable loss is exceeded. However, this IC can deal with reproduction of normal music signal sources sufficiently because it is believed to be sufficient that average output power of the normal music signal sources is estimated at 1/8 of the maximum output. ●Load impedance and filter constant The speaker that is connected to this IC is to have the load impedance (RL) of 4Ω or higher. Typical filter constants for load impedance (RL) when the cut-off frequency is set at 50kHz are as shown in the following table. Table: Filter constant example Load impedance RL L 4Ω 10μH 8Ω 22μH 16Ω 39μH C 1μF 0.47μF 0.27μF 10