The TA8205AH is a 22W x 2 two-channel audio power amplifier integrated circuit manufactured by Toshiba Corporation and is available in a 17-pin package.
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Each channel is composed of a preamplifier stage and a power amplifier stage, and the power amplifier stage is internally connected to a BTL form, so the output power is large.
It is widely used in high-end cars for cars such as Mitsubishi Pajero and CLARION, and SONY. TA8205AH has low thermal resistance coefficient, low noise, adjustable voltage gain and low distortion. It has overload protection and overheat protection.
In addition to short-circuit protection and mute function, there is also a standby function. Its operating voltage range is 9 to 18V.
When Vcc=13.2V, f=1kHz, RL=4Ω, Po=15W×2 (THD=10%);
When Vcc = 14.4 V, f = 1 kHz, and RL = 4 Ω, PO = 18 W × 2 (THD = 10%). The application circuit of TA8205AH is shown in the figure.
The 1st and 4th feet of the TA8205AH are the squelch control and standby control pins. When the voltage of pin 1 is in the range of 1.0 to 2.0V,
The mute function is turned off, and when the voltage of pin 1 is lower than the 1V threshold level, the mute circuit works. When the 4-pin voltage is greater than the 2.5V threshold voltage
When the internal electronic switch of the circuit is turned on, the circuit outputs normal power. As long as the voltage of the 4-pin is lower than 2.5V, the circuit is in the standby state.
There is no power output. If the standby function is not used, the 4 pin can be connected to the power supply VCC, and the amplifier operating current is only about 1 mA.
In the figure, C1 is the input coupling capacitor, C2 is the negative feedback capacitor of the preamplifier, and the capacities of C1 and C2 should be used according to the specific use.
The situation is optional to obtain the best anti-shock effect. C3 is a filter capacitor that reduces power fluctuations. It determines when it is turned on/off.
The time constant of the steady state. C4 is an anti-vibration capacitor, and a series-connected resistor forms an anti-vibration circuit, generally adopting temperature characteristics and high-frequency characteristics.
A good polyester film capacitor. C5 is the power supply filter capacitor, and C6 is the noise absorbing capacitor at the input end.
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