NJM7908FA
Overview
- Category: Integrated Circuit (IC)
- Use: Voltage Regulator
- Characteristics:
- Fixed Output Voltage: -8V
- Low Dropout Voltage
- High Ripple Rejection Ratio
- Thermal Shutdown Protection
- Package: TO-220
- Essence: Negative Voltage Regulator
- Packaging/Quantity: Tube/50 pieces
Specifications
- Input Voltage Range: -10V to -35V
- Output Voltage: -8V
- Output Current: 1A
- Dropout Voltage: 2V (typical)
- Ripple Rejection Ratio: 60dB (typical)
- Quiescent Current: 5mA (typical)
- Operating Temperature Range: -40°C to +125°C
Pin Configuration
The NJM7908FA has a standard TO-220 package with three pins:
- Input Pin (VIN): Connects to the input voltage source.
- Ground Pin (GND): Connected to the ground reference.
- Output Pin (VOUT): Provides the regulated -8V output.
Functional Features
- Voltage Regulation: The NJM7908FA maintains a constant -8V output voltage, regardless of changes in the input voltage or load conditions.
- Low Dropout Voltage: The regulator can operate with a small voltage difference between the input and output, minimizing power dissipation.
- High Ripple Rejection Ratio: It effectively filters out noise and ripple present in the input voltage, providing a stable output.
- Thermal Shutdown Protection: The IC includes a built-in thermal shutdown feature that protects it from overheating.
Advantages and Disadvantages
Advantages: - Precise and stable output voltage regulation. - Low dropout voltage reduces power dissipation. - High ripple rejection ratio ensures a clean output signal. - Thermal shutdown protection prevents damage due to overheating.
Disadvantages: - Fixed output voltage limits flexibility in certain applications. - Limited output current capability (1A).
Working Principles
The NJM7908FA is a negative voltage regulator that utilizes a series pass transistor to maintain a constant -8V output. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to regulate the output. The regulator operates in a linear mode, dissipating excess power as heat to maintain the desired output voltage.
Detailed Application Field Plans
The NJM7908FA is commonly used in various electronic devices and systems where a stable -8V voltage supply is required. Some typical application fields include:
- Audio Amplifiers: Provides a regulated negative voltage for audio amplification circuits.
- Instrumentation Systems: Used in analog measurement equipment to ensure accurate voltage references.
- Automotive Electronics: Regulates voltage for various automotive components, such as sensors and control modules.
- Power Supply Units: Used as a part of power supply circuits to provide a stable negative voltage rail.
Alternative Models
- LM7908: A similar negative voltage regulator from Texas Instruments.
- MC7908: Negative voltage regulator from ON Semiconductor.
- KA7908: Negative voltage regulator from Fairchild Semiconductor.
These alternative models offer similar functionality and can be used as replacements for the NJM7908FA in various applications.
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10个与NJM7908FA在技术解决方案中的应用相关的常见问题及解答
Sure! Here are 10 common questions and answers related to the application of NJM7908FA in technical solutions:
Q: What is NJM7908FA? A: NJM7908FA is a voltage regulator IC (Integrated Circuit) that provides a fixed output voltage of -8V.
Q: What is the input voltage range for NJM7908FA? A: The input voltage range for NJM7908FA is typically between -10V and -35V.
Q: What is the maximum output current of NJM7908FA? A: The maximum output current of NJM7908FA is 1A.
Q: Can NJM7908FA be used to regulate positive voltages? A: No, NJM7908FA is specifically designed to regulate negative voltages only.
Q: How does NJM7908FA handle thermal protection? A: NJM7908FA has built-in thermal shutdown protection that prevents the IC from overheating by shutting down when the temperature exceeds a certain threshold.
Q: Can NJM7908FA be used in automotive applications? A: Yes, NJM7908FA can be used in automotive applications as long as the operating conditions and temperature range are within its specified limits.
Q: Is an external heat sink required for NJM7908FA? A: It depends on the power dissipation and ambient temperature. If the power dissipation is high or the ambient temperature is high, an external heat sink may be necessary to keep the IC within its safe operating temperature range.
Q: Can NJM7908FA be used in parallel to increase the output current? A: No, NJM7908FA should not be used in parallel to increase the output current. It is recommended to use a higher current-rated voltage regulator IC for such applications.
Q: What are the typical applications of NJM7908FA? A: NJM7908FA is commonly used in various electronic devices and circuits where a regulated negative voltage of -8V is required, such as audio amplifiers, power supplies, and instrumentation.
Q: Are there any alternative voltage regulator ICs similar to NJM7908FA? A: Yes, there are other voltage regulator ICs available in the market that provide a fixed -8V output, such as LM7908 and MC7908. These alternatives can be considered based on specific requirements and availability.
Please note that these answers are general and may vary depending on the specific datasheet and application guidelines provided by the manufacturer of NJM7908FA.