NJM78M12FA
Overview
- Category: Integrated Circuit (IC)
- Use: Voltage Regulator
- Characteristics:
- Fixed output voltage of -12V
- Low dropout voltage
- High ripple rejection
- Thermal shutdown protection
- Package: TO-220F
- Essence: Monolithic integrated circuit
- Packaging/Quantity: Tube packaging, 50 pieces per tube
Specifications
- Input Voltage Range: 14V to 35V
- Output Voltage: -12V
- Output Current: Up to 500mA
- Dropout Voltage: 2V (max)
- Ripple Rejection: 70dB (typ)
- Operating Temperature Range: -40°C to +125°C
Pin Configuration
The NJM78M12FA has a standard three-pin configuration:
- Input Pin (VIN): Connects to the input voltage source.
- Ground Pin (GND): Connected to the ground reference.
- Output Pin (VOUT): Provides the regulated -12V output.
Functional Features
- Voltage Regulation: The NJM78M12FA regulates the input voltage to a fixed -12V output.
- Low Dropout Voltage: It maintains a stable output even when the input voltage is close to the desired output voltage.
- High Ripple Rejection: Filters out high-frequency noise and provides a clean output signal.
- Thermal Shutdown Protection: Automatically shuts down the device in case of excessive temperature to prevent damage.
Advantages and Disadvantages
Advantages: - Easy to use and integrate into electronic circuits. - Stable and reliable voltage regulation. - Compact size and low power consumption. - Suitable for various applications.
Disadvantages: - Limited output current capacity. - Requires external capacitors for stability. - Not suitable for high-power applications.
Working Principles
The NJM78M12FA is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a stable -12V output.
Detailed Application Field Plans
The NJM78M12FA is commonly used in various electronic devices and applications, including: - Power supplies for audio amplifiers - Industrial control systems - Automotive electronics - Battery-powered equipment - Instrumentation and measurement devices
Detailed and Complete Alternative Models
Some alternative models to the NJM78M12FA include: - LM7812: A popular 12V voltage regulator from Texas Instruments. - MC7812: Another widely used 12V regulator from ON Semiconductor. - UA7812: A 12V regulator manufactured by Fairchild Semiconductor.
These alternatives offer similar functionality and can be used as replacements depending on specific requirements.
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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af NJM78M12FA i tekniske løsninger
Sure! Here are 10 common questions and answers related to the application of NJM78M12FA in technical solutions:
Q: What is NJM78M12FA? A: NJM78M12FA is a voltage regulator IC that provides a fixed output voltage of +12V.
Q: What is the input voltage range for NJM78M12FA? A: The input voltage range for NJM78M12FA is typically between 14V and 35V.
Q: What is the maximum output current of NJM78M12FA? A: The maximum output current of NJM78M12FA is 500mA.
Q: Can NJM78M12FA handle higher input voltages than 35V? A: No, NJM78M12FA is not designed to handle input voltages higher than 35V. It may get damaged if exposed to higher voltages.
Q: Is NJM78M12FA suitable for automotive applications? A: Yes, NJM78M12FA can be used in automotive applications as long as the input voltage does not exceed its specified range.
Q: Does NJM78M12FA require any external components for operation? A: Yes, NJM78M12FA requires input and output capacitors for stability and filtering purposes. Refer to the datasheet for recommended values.
Q: Can NJM78M12FA be used in a battery-powered application? A: Yes, NJM78M12FA can be used in battery-powered applications as long as the battery voltage is within its input voltage range.
Q: What is the dropout voltage of NJM78M12FA? A: The dropout voltage of NJM78M12FA is typically around 2V. This means the input voltage must be at least 2V higher than the desired output voltage.
Q: Can NJM78M12FA handle short-circuit conditions? A: Yes, NJM78M12FA has built-in short-circuit protection. It will limit the output current to a safe level in case of a short circuit.
Q: Is NJM78M12FA available in different package options? A: Yes, NJM78M12FA is available in various package options such as TO-220, TO-252, and SOT-89. Choose the package that suits your application requirements.
Please note that these answers are general and may vary depending on the specific datasheet and manufacturer's recommendations for NJM78M12FA. Always refer to the official documentation for accurate information.