LM293AM

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The LM293AM is one of the most versatile comparators available in the linear-comparators market. It features a custom metal-oxide-semiconductor (CMOS) design that allows for efficient power consumption, high input impedance and fast response time, low bias current and a low drop-out voltage.

The LM293AM’s application field includes automotive, motors, audio, and wireless communication fields. It is specifically designed for voltage precision comparator applications. It is ideal for controlling servo motors, detecting low speed control signals, monitoring steady-state system voltages, and controlling power supplies, just to name a few.

The functioning of the LM293AM is based on the active output transistors that are used to switch the output to the appropriate logic state. The input voltage is compared to a reference voltage which is divided down and monitored by the comparator. The output of the comparator is either a high (VOH) level (if the input is greater than the reference voltage) or a low (VOL) level (if the input is smaller). This allows for precise monitoring and control over the circuit.

The LM293AM has an adjustable hysteresis which helps eliminates erratic switch behavior due to noise pulses. This hysteresis is implemented by the hysteresis voltage (Vh) which is generated by the internal adjustable voltage divider. The hysteresis voltage is then connected to the negative input terminal. As the input voltage deviates from the reference voltage, the hysteresis voltage adds or subtracts from the negative input voltage, changed the amount of hysteresis present in the circuit.

The LM293AM also has high common-mode rejection and a wide input voltage range of 5V to 20V. The power supply rejection ratio (PSRR) is also excellent with values of -100dB. The high level output current is also quite high at 50 mA. Furthermore, the LM293AM is fully protected against damage from input and output over-voltage conditions.

The overall power consumption of the LM293AM is very low, requiring only a few hundred micro-amps of quiescent current when used in the most efficient operating modes. This promotes system level efficiency while ensuring accurate voltage reference points.

In conclusion, the LM293AM is a very versatile and reliable comparator that is well-suited to a wide range of linear-comparator applications. Its high level output current, wide input voltage range, low power consumption, and excellent PSRR make it an excellent choice for any designer.

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