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hMaservice manual download site
Class-d audio power amplifier is often referred to as digital amplifier, specific models a lot, is now widely used in mobile phones, digital products, appliances such as flat-panel TV, following a case of common digital audio power amplifier IC TPA3123D2 is introduced.hMaservice manual download site
TPA3123D2 manufactured by Texas Instruments TI, the typical application circuit is shown in Figure 10. The chip voltage wide range, at 12V~25V voltages can work properly. In the condition of input voltage of 20V and provides 25W (4 ω) X2 power and efficiency is higher than 90%,hMaservice manual download site
TPA3123D2 built-in short circuit protection circuit is detected or load short circuit at the output, output will stop immediately. Meanwhile, the chip also has built-in overheat protection circuit, when the chip temperature exceeds 150 ¡æ, the IC into shutdown state, only when the chip temperature is reduced to 30 ¡æ, the internal circuitry not reboot.hMaservice manual download site
hMaservice manual download site
TPA3123D2 17, 18 feet for a two-channel gain settings of-end, if pulled on to a high level, the voltage gain of 36dB per channel. It should be noted is that TPA3123D2 input impedance with different gain has changed a lot, so the input coupling capacitor selection of capacity requirements according to the actual situation. If 17, 18 feet, through a 20K ω resistor connected to the power supply VCC, the IC's input impedance 9k ohms, if you select the input coupling capacitor 1 μ f, lower frequencies that can be received is approximately 18Hz.hMaservice manual download site
Note: the TPA3123 and the TPA31234 is a dual-channel class-d audio power amplifier circuits complete Ding-like, but the TPA3123 range and power output of the power supply is larger than TPA3124. When used with dual-channel amplifier, TPA3123 maximum output power 25W per channel, and TPA3124 of 15W.hMaservice manual download site
A using TPA3123D2 Mono amp circuit as shown in Figure 11. The circuit uses BTL. As BTL amplifier of the two inputs in the form of input is the reverse signal, and total number of audio signals for single-ended signals. Therefore, in this circuit adds a dual operational amplifier OPA2353-centered circuit, which use single-ended differential function. An op-amp as a follower of OPA2353, one for inverting amplifier, this pair reverse-phase signal output and has good symmetry.
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