Allicdata Part #: | LM78M12CTFS-ND |
Manufacturer Part#: |
LM78M12CT |
Price: | $ 0.00 |
Product Category: | Integrated Circuits (ICs) |
Manufacturer: | ON Semiconductor |
Short Description: | IC REG LINEAR 12V 500MA TO220-3 |
More Detail: | Linear Voltage Regulator IC Positive Fixed 1 Outpu... |
DataSheet: | LM78M12CT Datasheet/PDF |
Quantity: | 1000 |
1 +: | 0.00000 |
Series: | -- |
Packaging: | Tube |
Part Status: | Obsolete |
Output Configuration: | Positive |
Output Type: | Fixed |
Number of Regulators: | 1 |
Voltage - Input (Max): | 35V |
Voltage - Output (Min/Fixed): | 12V |
Voltage - Output (Max): | -- |
Voltage Dropout (Max): | 2V @ 500mA (Typ) |
Current - Output: | 500mA |
Current - Quiescent (Iq): | 6mA |
PSRR: | 80dB (120Hz) |
Control Features: | -- |
Protection Features: | Over Temperature, Short Circuit |
Operating Temperature: | 0°C ~ 125°C |
Mounting Type: | Through Hole |
Package / Case: | TO-220-3 |
Supplier Device Package: | TO-220-3 |
Base Part Number: | LM78M12 |
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The LM78M12CT integrated circuit is a three terminal fixed output voltage, negative voltage regulator. It has a current limit of 1.6A and a full thermal shutdown feature. Designed for a wide range of applications that require a regulated negative supply including computers, communication equipment, and automotive systems.
Features
- Input Voltage: -3V to -20V
- Output Voltage: Preset at -12V
- Ripple Rejection: 55dB
- Current Limit: 1.6A
- Short Circuit Protection: Thermal Shutdown
- Package: TO251-3L
Applications
- 15V and 20V Input Applications
- Computers
- Communication Equipment
- Automotive Systems
Working Principle
The LM78M12CT is a three terminal voltage regulator, specifically designed to provide a preset output voltage in accordance with the input voltage. It has a temperature compensation reference input whose output voltage is proportional to the temperature, and an output voltage feedback terminal. A temperature sensing element is also provided for temperature compensation. The output voltage of the LM78M12CT is given by:
VOUT = VREF - (VFB - VREF) × (VIN/(R3+R5)
Where VREF is the reference voltage, VFB is the output voltage feedback voltage, and VIN is the input voltage. R3 and R5 are the temperature compensation resistors.
The LM78M12CT features current limit and thermal shutdown protection. The current limit is set by the on-chip current limit circuitry and is a function of the difference between the input voltage and the output voltage. The thermal shutdown feature is provided to protect the device from overtemperature conditions.
Conclusion
The LM78M12CT is a three terminal fixed output voltage, negative voltage regulator for a variety of applications including computers, communication equipment and automotive systems. It features current limit and thermal shutdown protection, and is designed for 15V and 20V input applications. The output voltage of the LM78M12CT is given by an equation that uses reference voltage, output voltage feedback voltage and input voltage as parameters.
The specific data is subject to PDF, and the above content is for reference
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