170w audio power amplifier

The combination of controller IC LM4651 and LM4652 Class D MOSFET power amplifier IC provides a high-efficiency solution suitable for powered speakers, subwoofers, and car amplifiers. The LM4651 is a fully integrated conventional pulse width modulator (PWM) driver, which contains low-voltage circuits, short circuit protection, overshoot protection, and thermal shutdown circuit protection. The IC has a standby function that disables the pulse width modulation, minimizing the current draw. The LM4652 is a fully integrated H-bridge power MOSFET IC housed in a TO220 power package. This IC features a temperature sensor that alerts the LM4651 when the die temperature exceeds a specified threshold. When used together, the LM4651 and LM4652 create a simple, compact, efficient, and high-quality audio power amplifier solution that includes protection features typically found only in Class AB amplifiers. The maximum efficiency of this circuit is 85% at 125 W, with an expected attenuation greater than 100 dB. The total harmonic distortion (THD) at 10 W and 4 ohms, across the frequency range of 10 to 500 Hz, is a maximum of 0.3%. The supply voltage must not exceed ±22 V.

The LM4651 controller IC operates by utilizing a pulse width modulation technique to control the output power delivered to the load, which is crucial for achieving high efficiency in audio amplification. This PWM driver is designed to manage the switching characteristics of the connected MOSFETs, allowing for minimal energy loss during operation. The built-in protection features, such as short circuit and thermal shutdown, ensure reliable operation under various load conditions, enhancing the longevity of the amplifier.

The LM4652, as an H-bridge power MOSFET driver, allows for efficient control of the output stage, enabling bidirectional current flow necessary for driving speakers effectively. The TO220 package provides adequate thermal management, which is essential for high-power applications. The integrated temperature sensor plays a critical role in maintaining safe operating conditions by signaling the LM4651 to reduce power or shut down if the temperature exceeds safe limits.

The combination of these two ICs results in an audio amplifier that not only delivers high-quality sound reproduction but also incorporates advanced protection mechanisms. The efficiency rating of 85% at 125 W indicates that the circuit can deliver substantial power while minimizing heat generation, which is particularly beneficial in compact designs where space and thermal management are critical. With a THD of 0.3% at specified conditions, the amplifier maintains audio fidelity, making it suitable for high-performance audio applications.

Overall, the LM4651 and LM4652 together provide a robust solution for audio amplification, combining efficiency, compactness, and reliability, making them ideal for use in various audio applications, including powered speakers and automotive sound systems. The design considerations ensure that the amplifier performs optimally while adhering to safety standards, thereby enhancing user experience and system performance.The combination of controller IC LM4651 and LM4652 Class D MOSFET power amplifier IC power amplifier solution provides a high efficiency, suitable for powered speakers, subwoofers and amplifiers car quality. The LM 4651 is a fully integrated conventional pulse width modulator (PWM) driver, which contain low-voltage circuit, short, overshoot, and t

hermal shutdown circuit protection. The IC has a standby function which shuts the pulse width modulation, minimizing the current bid. The LM 4652 is a fully integrated H-bridge power MOSFET IC in a TO220 power pack. The IC has a temperature sensor to alert the LM4651 when the die temperature exceeds the threshold limit. Used together, LM4651 and LM4652 as a simple, compact, efficient, high quality audio power amplifier complete solution for protection, usually seen only in class AB amplifiers.

The maximum efficiency of this circuit is 85% to 125 W with an expected attenuation of greater than 100 dB. The THD at 10W, 4 ohm, 10 - 500 Hz max. 0. 3%. The supply voltage can not exceed ± 22V. 🔗 External reference