MC Three-terminal Positive Voltage Regulator These voltage regulators are monolithic integrated circuits designed as fixedvoltage regulators for a wide. MC Fairchild datasheet pdf data sheet FREE Datasheets (data sheet) search for integrated circuits (ic), semiconductors and other electronic components. Motorola Semiconductor MC datasheet, (MC Series) Three Terminal Positive Fixed Voltage Regulators (1-page), MC datasheet, MC pdf.
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These regulators employ internal current limiting, thermal shutdown, and safe-area compensation. With adequate heatsinking they can deliver output currents in excess of 1.
Although designed primarily as a fixed voltage mc78812, these devices can be used with external components to obtain adjustable voltages and currents. Output Current in Excess of 1. No External Components Required?
Internal Thermal Overload Protection? Internal Short Circuit Current Limiting? Output Transistor Safe-Area Compensation?
The input voltage must remain typically 2. XX, These two digits of the type number indicate nominal voltage.
Values of less than 0. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Nc7812 Conditions may affect device reliability. Machine Model Method V.
Representative Schematic Diagram http: Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. In many low current applications, compensation capacitors are not required. However, it is recommended that mc712 regulator input be bypassed with a capacitor if the regulator is connected datasjeet the power supply filter with long wire lengths, or if the output load capacitance is large.
An input bypass capacitor should be selected to provide good high-frequency characteristics to insure stable operation under all load conditions.
MC Datasheet(PDF) – Fairchild Semiconductor
The bypass capacitor should be mounted with the shortest possible leads directly across the regulators input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead.
In order to minimize dissipation the MCC is chosen in this application. Resistor R determines the current as follows: For example, a 1.
MC Datasheet PDF –
The minimum voltage obtainable with this arrangement is 2. Current Regulator Figure 9. The circuit of Figure 10 can be modified to provide supply protection against short circuits by adding a short circuit sense resistor, RSC, and an additional PNP transistor.
The current sensing PNP must be able to handle the short circuit current of datashert three-terminal regulator. Therefore, a four-ampere plastic power transistor is specified. The MJ provides current to 5. Resistor R in conjunction with the VBE of the PNP determines when the pass transistor begins conducting; this circuit is not short circuit proof. Current Boost Regulator Figure Short Circuit Protection http: The measurement dwtasheet made under conditions of low dissipation or by using pulse techniques such that the average chip temperature is not significantly affected.
Load Regulation – The change in output voltage for a change in load current at constant chip temperature. Maximum Power Dissipation – The maximum total device dissipation for which the regulator will operate within specifications. Output Noise Voltage – The rms ac voltage at the output, with constant load and no input ripple, measured over a specified frequency range.
Long Term Stability – Output voltage stability under accelerated life test conditions with the maximum rated voltage listed in the devices’ electrical characteristics and maximum power dissipation. NCV prefix is for automotive and other applications datasgeet site and change control. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
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