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NJM7909FA
Product Overview
- Category: Integrated Circuit (IC)
- Use: Voltage Regulator
- Characteristics:
- Low dropout voltage
- High ripple rejection
- Short circuit protection
- Thermal shutdown protection
- Package: TO-220F
- Essence: Negative Voltage Regulator
- Packaging/Quantity: Tube, 50 pieces per tube
Specifications
- Input Voltage Range: -35V to -10V
- Output Voltage: -9V
- Output Current: 1A
- Dropout Voltage: 2V (typical)
- Ripple Rejection Ratio: 60dB (typical)
- Operating Temperature Range: -40°C to +125°C
Detailed Pin Configuration
The NJM7909FA has a standard three-pin configuration:
- Input Pin (Pin 1): Connects to the input voltage source.
- Ground Pin (Pin 2): Connected to the ground or common reference point.
- Output Pin (Pin 3): Provides the regulated output voltage.
Functional Features
- Negative Voltage Regulation: The NJM7909FA regulates the input voltage to a stable -9V output voltage.
- Low Dropout Voltage: The IC maintains regulation even when the input voltage is close to the output voltage.
- High Ripple Rejection: Filters out noise and ripple present in the input voltage.
- Short Circuit Protection: Safeguards the IC from damage in case of a short circuit.
- Thermal Shutdown Protection: Prevents overheating by shutting down the IC when the temperature exceeds a certain threshold.
Advantages and Disadvantages
Advantages: - Stable and accurate negative voltage regulation. - Wide operating temperature range. - Built-in protection features enhance reliability. - Compact TO-220F package allows for easy integration.
Disadvantages: - Dropout voltage may cause power dissipation and efficiency loss. - Limited output current capability (1A).
Working Principles
The NJM7909FA is a linear voltage regulator that uses a negative feedback mechanism to maintain a constant -9V output voltage. It consists of a series pass transistor, error amplifier, and voltage reference. The error amplifier compares the output voltage with a fixed reference voltage and adjusts the series pass transistor accordingly to regulate the output voltage.
Detailed Application Field Plans
The NJM7909FA is commonly used in various applications requiring a stable -9V power supply. Some typical application fields include:
- Audio Equipment: Provides a regulated negative voltage for audio amplifiers and preamplifiers.
- Industrial Control Systems: Used in control circuits, sensors, and actuators that require a negative voltage source.
- Automotive Electronics: Provides a reliable negative voltage for automotive systems such as car radios and navigation systems.
- Test and Measurement Instruments: Used in laboratory equipment and test setups that require a negative voltage reference.
Detailed and Complete Alternative Models
- LM7909: Similar negative voltage regulator IC manufactured by Texas Instruments.
- MC79L09: Negative voltage regulator IC produced by ON Semiconductor.
- KA7909: Another alternative from Fairchild Semiconductor.
These alternative models offer similar functionality and can be used as substitutes for the NJM7909FA in various applications.
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Liệt kê 10 câu hỏi và câu trả lời thường gặp liên quan đến ứng dụng NJM7909FA trong giải pháp kỹ thuật
Sure! Here are 10 common questions and answers related to the application of NJM7909FA in technical solutions:
Q: What is NJM7909FA? A: NJM7909FA is a voltage regulator IC that provides a fixed output voltage of -9V.
Q: What is the input voltage range for NJM7909FA? A: The input voltage range for NJM7909FA is typically between -11V and -35V.
Q: What is the maximum output current of NJM7909FA? A: The maximum output current of NJM7909FA is 1A.
Q: Can NJM7909FA be used to regulate positive voltages? A: No, NJM7909FA is specifically designed to regulate negative voltages only.
Q: How does NJM7909FA handle thermal protection? A: NJM7909FA has built-in thermal shutdown protection that prevents the IC from overheating.
Q: Can NJM7909FA be used in automotive applications? A: Yes, NJM7909FA is suitable for automotive applications as it can operate within the required temperature range.
Q: What is the typical dropout voltage of NJM7909FA? A: The typical dropout voltage of NJM7909FA is around 2V.
Q: Is an external capacitor required for stability with NJM7909FA? A: Yes, an external capacitor is necessary for stability. A 0.33μF ceramic capacitor is recommended.
Q: Can NJM7909FA be used in high-frequency applications? A: NJM7909FA is not suitable for high-frequency applications due to its limited bandwidth.
Q: What are some common applications of NJM7909FA? A: NJM7909FA is commonly used in audio amplifiers, power supplies, and other circuits that require a regulated -9V voltage source.
Please note that these answers are general and may vary depending on the specific datasheet and application requirements.