YDA136 Ver la hoja de datos (PDF) - Yamaha Corporation
Número de pieza
componentes Descripción
Fabricante
YDA136 Datasheet PDF : 32 Pages
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YDA136
■Digital Amplifier Function
YDA136 has a 2-channel differential analog signal input digital amplifier controller.
This digital amplifier controller consists of High-Side and Low-Side PowerMOSFET drivers and a PWM circuit.
By combining the two sets of Pch/Nch PowerMOSFET in each channel, a digital amplifier (60W to 100W) can be
configured.
To each PowerMOSFET driver, it is possible to set up an off-time individually, and it can be set as the optimal driver
according to PowerMOSFET to be used.
AM intermodulation can be performed with AM reception interference reduction function.
Moreover, it can be optimized to the digital amplifier which has a lower distortion by adding a filter element to a PWM
circuit.
●Gain Setup Method
The gain of digital amplifier can be set up by external resistance (RE1 to RE4).
The gain of digital amplifier can be calculated with the following formula.
Av(dB)
=
20
⋅
log⎜⎜⎝⎛
RE1⋅
RE2 +
RE 2
RE2 ⋅ RE3 + RE1
⋅ (RE4 + 400Ω)
⋅
RE3
⎟⎟⎠⎞
However, be sure to set RE4 as more than 10kΩ according to the capability of a built-in operational amplifier.
●Characteristic Improvement by External Filter Element Connection
Although it is possible to realize high performance digital amplifier by the PWM circuit, by adding resistor and a capacitor
between DBPL(FBPR) and ITPL (ITPR), and between FBML (FBMR) and ITML (ITMR), it is possible to optimize a
circuit further and to improve distortion rate.
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