Car amplifier TA8205AH application and substitution

Description: A Mitsubishi Pajero car audio system is experiencing a silent fault, while other features remain operational. The issue is traced to a damaged amplifier IC, specifically the TA8205AH. This integrated circuit, produced by Toshiba, is a dual-channel audio power amplifier rated at 22W, housed in a 17-pin package. Each channel consists of a pre-amplification stage and a power amplification stage configured in a BTL (Bridge-Tied Load) arrangement, allowing for increased output power. The TA8205AH is commonly used in high-end stereo systems for vehicles, including those from Mitsubishi Pajero, CLARION, and SONY.

The TA8205AH features a low thermal resistance coefficient, adjustable voltage gain, minimal distortion, and built-in protections such as overload protection, thermal protection, short circuit protection, and a mute function. Additionally, it has a standby function. Its operating voltage ranges from 9V to 18V, with a typical Vcc of 13.2V. At this voltage, with a frequency of 1 kHz and a load resistance of 4 ohms, the output power is 15W (with a total harmonic distortion of 10%). At 14.4V, the output power increases to 18W under the same conditions.

The pin configuration includes a mute control and standby control pin. When the voltage at this pin is between 1.0V and 2.0V, the mute function is inactive. If the voltage drops below 1V, the mute circuit activates. Conversely, if the pin voltage exceeds 2.5V, the internal electronic switch engages, allowing normal power output. If the standby function is not utilized, this pin can be connected directly to the power supply (VCC), resulting in a low operating current of approximately 1mA.

The circuit includes input coupling capacitors (C1, C2) for the preamplifier, which should be selected based on application needs to optimize sound quality. Capacitor C3 functions as a filter to stabilize power fluctuations, while capacitor C4 provides anti-vibration protection, typically paired with a resistor. Capacitors C5 and C6 act as power supply filter capacitors, absorbing vibrations.

Additionally, similar models such as the TA8210AH, TA8215AH, TA8221AH, and KIA6210AH, KIA6216H from South Korea have identical pin functions. The KIA6210AH matches the output power of the TA8205AH, while the others have slightly different output ratings. The TA8205AL, TA8210AL, TA8215AL, and TA8221AL share the same internal circuitry but come in a 17-pin single in-line package. The system has been functioning normally after replacing the TA8205AH with a TA8210AH for several months.A Mitsubishi Pajero car audio, fault phenomenon is silent, and the rest feature to work, the search for the amplifier IC TA8205AH damage. TA8205AH Toshiba company produces 22W 2 dual-channel audio power amplifier integrated circuits, with a 17-pin package. Each channel from the pre-amplification stage and the power amplification stage composed of an internal power amplifier stage connected to BTL form, so the output power, is widely used in such as the Mitsubishi Pajero and CLARION (Clarion), SONY and many other brands of vehicles high-end stereo. TA8205AH low coefficient of thermal resistance, noise, voltage adjustable gain, less distortion, in addition to internal features overload protection, thermal protection, short circuit protection and mute function, but also has a standby function.

Its operating voltage range of 9 ~ 18V, the Vcc 13.2V, f 1kHz, RL 4 when, Po 15W 2 (THD 10%); at Vcc 14.4V, f 1kHz, RL 4 when, PO 18W 2 (THD 10%). TA8205AH application circuit as shown in FIG. TA8205AH of O feet, feet are muting control and standby control pin. O feet when the voltage range of 1.0 ~ 2.0V, the mute function is off, when the voltage drops below 1V O foot threshold level, muting circuit.

When pin voltage is greater than the threshold voltage of 2.5V, an internal electronic switch circuit is turned on, normal power output circuit, as long as pin voltage is lower than 2.5V, the circuit is in the standby mode and no power output. Without the use of standby function, feet can be connected to the power supply VCC, the amplifier is operating current of only about 1mA.

The figure is the input coupling capacitor C1, C2 is the negative feedback preamplifier capacitor capacitance C1, C2 shall be optional depending on usage, in order to obtain the best anti-impact sound effects. C3 To reduce the power fluctuations of the filter capacitor, it decided to open/arrival time constant steady shutdown.

Capacitor C4 to the anti-vibration, anti-vibration circuit in series with a resistor, the general temperature characteristics and high-frequency characteristics of a good polyester film capacitors. The power supply filter capacitor C5, C6 for the input capacitance of vibration absorption. The investigation materials, Toshiba produced the same series TA8210AH, TA8215AH, TA8221AH and South Korea produced KIA6210AH, KIA6216H package pin functions are identical, which KIA6210AH TA8205AH same output power, the output power of the remaining several slightly different (TA8210AH to 20W 2, TA8215AH of 18W 2, TA822AH of 30W 2, KIA6216H of 15W 2), can be interchanged.

TA8205AL, TA8210AL, TA8215AL, TA8221AL internal circuit exactly the same, but uses a 17-pin single in-line package. The machine is now a normal substitution after TA8210AH work for several months.