LM2901DTBR2

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Linear - Comparators

Linear Comparators are voltage comparison circuits which can be used to compare two varying voltage signals and output a digital logic level (high or low) based upon the level of the input signals. Such comparison circuits are used in several applications like motor control, battery monitoring, level detection, AGC (Automatic Gain Control) systems, and so on.

One of the popular comparisons circuits is LM2901DTBR2. This voltage comparison circuit is a low-power and cost-effective circuit designed using a BiCMOS process. It has 2 output pins and 2 input pins along with a shut-down pin for controlling the circuitry. This comparison circuit is mainly used for switching applications.

Application Field

The LM2901DTBR2 is used in applications such as motor control, level detection and in the battery monitoring systems. It is widely used in the motor control applications that require fast switching action with very low power consumption.

The primary purpose of the LM2901DTBR2 is to monitor the level of the input and output the logic level of high or low. This is mainly used to detect the level in liquid and send the needed information to the processor. It is also used to monitor charging and discharging of the battery so that it can be prevented from overcharging and discharging. Another application field of the LM2901DTBR2 is in the consumer electronic circuits where it is mainly used for the on/off switching action.

Working Principle

 The working principle of the circuit is very simple. It essentially compares the input voltage with a reference voltage level. The reference voltage is set by an external resistor or an internal reference generator. The input voltages can be supplied from a potentiometer or a bridge type input source.

When the reference voltage and the input voltage are equal, the output of the circuit is steady-state and the comparator output remains low. When the input voltage exceeds the reference voltage , the output of the LM2901DTBR2 is set, and the comparator output becomes high. Similarly, if the input voltage is lower than the reference voltage, the output remains low.

The output levels of the comparator can be easily configured by selecting the operating mode. It can be operated in single-ended, open-collector or open-drain modes. The open-collector mode is mainly used to invert the output level. The output of the open-collector has the same level as the input, while the open-drain output is always one logic level lower than the input voltage.

The LM2901DTBR2 can also be used for high precision voltage comparison as it has a very low offset voltage (< 2 mV) and a high output capability (up to 0.8 A). The circuit also features a low offset voltage temperature coefficient (< 2 µV/°C) and a property of rejecting the common mode voltage by up to 70 dB.

The high-gain differential amplifier inside the circuit also gives it an advantage of high-speed switching when the input voltage crosses the reference voltage. It is also proven to be reliable with a ±100 mV overshoot in response to the changes in the input levels.

Thus, the LM2901DTBR2 is a highly cost-effective and low-power voltage comparison circuit designed using a BiCMOS process. It is used for a wide range of applications such as motor control, level detection, battery monitoring and other switching applications. It features low offset voltage, low power consumption and high-speed switching capabilities.

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