LE80ABZ

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LE80ABZ application field and working principle

LE80ABZ is an integrated linear voltage regulator from Unisonic Technologies which is specifically designed for the automotive industry. It offers a typical output current of 1.5A and a wide input voltage range of 8V to 16V. It operates over a wide temperature range of -40 to 150°C and is available in Lead Free and RoHS compliant (Green) packages.

The LE80ABZ series of Voltage Regulators is designed to provide a regulated output voltage with very low dropout voltage, high output current and low output noise. It is ideal for applications such as ECU and telemetric systems, stationery and base stations, GPS and automotive electronic power systems.

Applications of LE80ABZ

• Power supply for automotive ECUs
• Power supply for automotive telemetric systems
• Power supply for stationery and base stations
• Power supply for GPS navigation systems
• General purpose power supply

Working principle of LE80ABZ

The basic working principle of the LE80ABZ is that it outputs a regulated voltage of 5V, 6V, 8V or 12V depending on the input voltage, load current and output voltage selected. The output voltage is maintained despite changes in the load current or temperature.

The LE80ABZ consists of an error amplifier, an NPN power transistor, a 2.5V reference voltage, current limit circuitry and thermal shutdown circuitry. When the input voltage is applied to the regulator, the error amplifier senses the difference between the 2.5V reference voltage and the output voltage. If the output voltage is lower than the reference voltage, the error amplifier will increase the base current of the NPN power transistor, causing the voltage output to increase. If the output voltage is higher than the reference voltage, the error amplifier will decrease the base current of the NPN power transistor, causing the voltage output to decrease. This process continues until the output voltage reaches the reference voltage. At this stage, the output voltage remains constant.

In addition, LE80ABZ has over-current protection and thermal shutdown to protect against device failure. The over-current protection circuitry will limit the output current to a safe level when the load is too high. The thermal shutdown circuitry can shut down the device when the temperature rises above a specified level. This will prevent the device from being damaged due to too high a temperature.

Conclusion

The LE80ABZ Voltage Regulator is an excellent choice for applications requiring a regulated output voltage with very low dropout, high output current and low output noise. With its wide input voltage range, wide temperature range, over-current protection and thermal shutdown, it is highly suitable for automotive, stationery and general purpose applications.

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