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Wiring Connections:
- Input Pin (Pin 1): Connects to the negative input voltage source. Ensure the voltage is within the specified input range (-7V to -35V DC).
- Output Pin (Pin 3): Provides the regulated -5V output. Connect this pin to the part of your circuit that requires a stable negative voltage.
- Ground Pin (Pin 2): Connects to the circuit ground. This pin serves as the reference point for the output voltage.
Power:
- Input Voltage Range: -7V to -35V DC
- Output Voltage: -5V DC
- Current Capacity: Up to 1.5A, suitable for a range of applications requiring moderate current
- Power Dissipation: Depends on the difference between input and output voltage and the current being drawn.
Input and Output:
- Input: The regulator takes a negative voltage input within the range of -7V to -35V. The input voltage must be higher (more negative) than the output voltage by at least the dropout voltage.
- Output: Provides a stable -5V output. This output can be used to power other components or circuits needing a negative voltage supply.
Physical Characteristics:
- Package: TO-220, a common package type for regulators, with three pins for easy mounting and connection.
- Dimensions: The TO-220 package measures around 10.16mm x 4.8mm x 14.2mm (length x width x height).
- Heat Sink: It’s advisable to use a heat sink for the regulator if operating close to its maximum current rating to ensure effective thermal management.
Technical Specifications:
- Output Voltage Tolerance: ±4%
- Dropout Voltage: 2V at 1A load
- Ripple Rejection Ratio: around 50dB, which helps in reducing the effect of AC ripple on the output voltage
- Line Regulation: ±0.05% per V change in input voltage
- Load Regulation: ±0.1% for a 1A load
Additional Features:
- Robust Design: Designed to operate reliably in various conditions and environments, providing stable output even under fluctuating input conditions.
- Low Noise: Provides a low noise output, beneficial for sensitive analog and digital circuits.
- Versatile Applications: Suitable for use in power supplies, signal conditioning, and any application requiring a stable negative voltage.
How to Use:
- Preparation:
- Step 1: Ensure you have the appropriate input voltage within the range of -7V to -35V DC.
- Step 2: Gather the necessary components, including the L7905CV regulator, connecting wires, and a suitable heat sink if needed.
- Wiring the Regulator:
- Step 1: Connect the input pin (Pin 1) to the negative voltage source. Ensure the input voltage is higher than -5V by at least 2V.
- Step 2: Connect the ground pin (Pin 2) to the common ground of your circuit.
- Step 3: Connect the output pin (Pin 3) to the part of your circuit that requires -5V DC.
- Testing:
- Step 1: Power on the input source and measure the output voltage using a multimeter to ensure it is -5V DC.
- Step 2: Verify that the output is stable and the regulator is not overheating. Attach a heat sink if necessary to manage heat dissipation.
- Application Integration:
- Step 1: Mount the regulator securely in your circuit. Ensure good ventilation around the regulator for heat dissipation.
- Step 2: Connect the regulated -5V output to your circuit as required.
- Step 3: Monitor the regulator during initial use to ensure it is functioning correctly and maintaining a stable -5V output.
- Maintenance and Care:
- Step 1: Periodically check the connections and output voltage to ensure continued proper operation.
- Step 2: Ensure the regulator is not exposed to conditions that exceed its rated specifications, such as excessive temperature or voltage.
The L7905CV Negative Voltage Regulator is a reliable component for providing a stable -5V DC output from a higher negative voltage source. Its features, including thermal protection and short-circuit protection, ensure safe and consistent performance. Proper wiring and understanding of its specifications will help you effectively use this regulator in your electronic projects.
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