Allicdata Part #: | MC78L12ACPOS-ND |
Manufacturer Part#: |
MC78L12ACP |
Price: | $ 0.00 |
Product Category: | Integrated Circuits (ICs) |
Manufacturer: | ON Semiconductor |
Short Description: | IC REG LINEAR 12V 100MA TO92-3 |
More Detail: | Linear Voltage Regulator IC Positive Fixed 1 Outpu... |
DataSheet: | MC78L12ACP Datasheet/PDF |
Quantity: | 1000 |
Series: | -- |
Packaging: | Bulk |
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): | -- |
Current - Output: | 100mA |
Current - Quiescent (Iq): | 6.5mA |
PSRR: | 42dB (120Hz) |
Control Features: | -- |
Protection Features: | Over Temperature, Short Circuit |
Operating Temperature: | 0°C ~ 125°C |
Mounting Type: | Through Hole |
Package / Case: | TO-226-3, TO-92-3 (TO-226AA) |
Supplier Device Package: | TO-92-3 |
Base Part Number: | MC78L12 |
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The MC78L12ACP is a voltage regulator integrated circuit (IC) in the linear voltage regulator series of PMIC (power management IC) products. This particular model handles three-terminal negative regular voltage, has a maximum output current rating of 100mA and a customary output voltage rating of 12V.
The MC78L12ACP is considered to be an ideal solution for applications that require fixed-voltage negative output. Industries such as telecom, networking, system control, clock control and HVAC, to name a few, are prime beneficiaries of the MC78L12ACP.
Like other products in the linear voltage regulator series, the MC78L12ACP functions by monitoring the differential voltage (Vdf) between the input voltage (Vin) and the output voltage (Vout). If the output voltage deviates from its set level, the MC78L12ACP will increase or decrease Vin by adjusting the base current of the internal pass transistors, maintaining a constant output.
The bottom line is that, thanks to the MC78L12ACP, regulating the input voltage to the output voltage is done extremely quickly and accurately.
Although not all components used in the MC78L12ACP function the same way, the diagram below is a general description of the typical operating principle.
The control circuit is composed of operational amplifiers A1 and A2, which perform the comparator-like role. A1 compares Vin with the output reference voltage, which is set using the voltage divider network - a resistor connected to the output voltage (Vout) and a potentiometer. A2 functions to terminate the passing transistors when the operating thermal conditions reach above the rating.
The output voltage is controlled by the two pass transistors Q1 and Q2. They control the input voltage (Vin) and the input current Iin passing to the load. The current flowing from the power supply S supplies the base current (Ib) to the pass transistor Q1, Q2, which controls the input current (Iin) flowing to the load, thus determining the output voltage (Vout).
The voltage output is adjustable with the help of the voltage divider network as mentioned above, while the MC78L12ACP maintains a constant output voltage - thanks to its voltage control loop, which is a closed loop formed by Vdf, amplifier A1, and transistors Q1, Q2.
In conclusion, the MC78L12ACP is a three-terminal voltage regulator that operates on a linear voltage regulator principle, and it provides a reliable, cost-effective and accurate way for users to regulate their input and output voltages according to their application requirements.
The specific data is subject to PDF, and the above content is for reference
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