NJM7820FA

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NJM7820FA Application Field and Working Principle

NJM7820FA is a 3-terminal fixed output voltage regulator which is often classified as a linear voltage regulator (PMIC). It is frequently used in many consumer electronics and low-side applications, such as LCDs, DVD players, printers and much more. The NJM7820FA also provides excellent stability when used in high-voltage applications requiring line and load regulation, especially when voltage and current conditions can be unpredictable.

The NJM7820FA is a very popular and commonly used device for various low-side power applications.

Features of NJM7820FA:

• Low input voltage range of 2.0V to 50V
• High output current of up to 500 mA
• Output voltage adjustable from 1.2V to 36V
• On-chip over current, short circuit and thermal protection
• Guaranteed temperature stability over temperature range of -40℃ to +125℃

Working Principle of NJM7820FA

The NJM7820FA is a low-side voltage regulator whose structure includes an error amplifier, a PNP power pass transistor, and over-current, short circuit, and thermal protection circuits. Through the connection of external components, the NJM7820FA can output a constant voltage, regardless of input voltage, load variation, and temperature.

The NJM7820FA consists of an internally adjusted reference voltage source and an error amplifier. The temperature-compensated and current-limited reference voltage flows through the voltage divider, and the output voltage is adjusted by the external feedback resistor. The output voltage is monitored by the error amplifier, and when the output voltage deviates, it amplifies the deviation signal and feeds back the signal to the voltage divider to adjust the output voltage automatically.

The PNP power pass transistor is connected between the output terminal and ground. When the voltage divider adjusts the output voltage, the transistor conducts or cut off, allowing the current to flow or stop flowing, thus controlling the output voltage.

Advantages of NJM7820FA

• Excellent line and load regulation
• High accuracy
• Low-dropout voltage
• Low voltage ripple
• Effective thermal protection

Applications of NJM7820FA

NJM7820FA is a low-side voltage regulator, so it can be used in a wide variety of low-side applications, such as:

• LCD monitors and TVs
• Printers
• Inverter supplies
• LCD drivers
• Medical devices
• Telecom equipment
• PC motherboards
• LED backlight drivers
• Power adapters

NJM7820FA is a low-side voltage regulator, so it is a cost-effective and reliable solution for these applications.

The NJM7820FA is a popular, reliable, and cost-effective linear voltage regulator with many features, making it a great choice for low-side voltage regulation applications.

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