LMH6643MA/NOPB

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Introduction

The LMH6643MA/NOPB is a high voltage, low power, low-dropout amplifier, optimized for use in instrumentation systems. The unit is capable of supplying up to 4-amps continuous current at greater than 5V from a single supply, ensuring optimal performance in a wide range of applications.

Applications

The LMH6643MA/NOPB is ideal for use in a variety of applications in instrumentation systems, such as closed loop control systems, medical monitoring systems, data loggers, and sensor control systems. It is capable of supplying high currents at low noise levels, making it perfect for applications that require precision measurements.

Working Principle

The LMH6643MA/NOPB uses a low-dropout architecture to maximize efficiency, while maintaining a high input impedance. Low-dropout amplifiers are a form of voltage regulators that use a transistor to control the output voltage. The transistor is connected to a reference voltage source, allowing the control of the output voltage to a few hundred millivolts over the input voltage range.

The output voltage of low-dropout amplifiers is kept to a minimum and filtered with a current source resistor. This helps reduce self-heating, output and supply noise. The architecture also allows for a wide range of operating conditions, including single and split supplies.

Design Considerations

When designing with the LMH6643MA/NOPB, care should be taken to ensure that the input, output and supply lines are adequately protected from power surges and spikes, as these can cause damage to sensitive electronic components. Overvoltage protection should be considered by including a Zener diode in series with the input voltage, to ensure no voltage above the specified range can enter the amplifier.

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