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PMIC - Voltage Regulators - Linear

AP78L08VL-A is a voltage regulator developed by Aouhua Semiconductor and was released in May 2017. It typically APPLICATIONs as a low-side poWER switch. This voltage regulator is capable of performing step up, step down and inverting powers and voltage conversion. Its compact size, high efficiency and small form factor make it ideal for a number of applications including power supplies, battery management systems and communication systems.

AP78L08VL-A Application Field

Due to its small size, high efficiency, wide input voltage range and low quiescent current, the AP78L08VL-A is well-suited for a variety of consumer and industrial applications. Some of these applications include:

• LED lighting systems
• Battery management systems
• DC-DC converters
• Computing and portable audio products
• Telemetry and data acquisition systems
• Communication systems
• Automotive industry
• Consumer electronics

Working Principle

The AP78L08VL-A uses the principle of an adjustable linear regulator. It works by adjusting the output voltage via a control signal. This is done by using two feedback resistors, one to set the output voltage and one to sense the current. The internal IC compares the output voltage with its reference voltage and adjusts the duty cycle of the output current accordingly. This is done by either increasing or decreasing the duty cycle of the output current, depending on whether the output voltage is too low or too high, respectively. The duty cycle is kept within specified limits and the output voltage is maintained as close to its set value as possible.

The AP78L08VL-A is also equipped with a reset circuit which will reset the output voltage if it drops below a specified level. This prevents the output voltage from dropping to a dangerously low level and causing damage to the circuit. Finally, the AP78L08VL-A can also be used as a constant current source to regulate the current flow from a voltage source, allowing the current to remain independent of the load or external voltage changes.

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