MC34063ADR2G Switching Regulator Working Principle, Specifications and Applications
08 January 2024
Ⅱ. Technical parameters of MC34063ADR2G
Ⅲ. How does MC34063ADR2G work?
Ⅳ. MC34063ADR2G symbol, footprint and pin configuration
Ⅴ. What are the advantages and disadvantages of MC34063ADR2G?
Ⅵ. What are the main application fields of MC34063ADR2G?
Ⅶ. MC34063ADR2G common problems and solutions
MC34063ADR2G, as a member of the MC34063A series, is an integrated chip with powerful functions. In this article, we will introduce its alternatives, specifications, advantages and disadvantages, working principle and applications so that you can better understand and apply this chip.
MC34063ADR2G is a monolithic bipolar linear integrated circuit dedicated to the control part of DC to DC converters. The converter operates over a temperature range of 0°C to 70°C. It has a typical switching current of 1.5 A and a switching frequency of up to 100 kHz. Internal circuits include reference voltage sources, oscillators, converters, logic control circuits and switching transistors. Among them, the reference voltage source is a temperature-compensated bandgap reference source. The oscillation frequency of the oscillator is determined by the external timing capacitor on pin three. The switching transistor is turned ON by the reverse input end of the comparator and the logic control circuit connected to the oscillator. , and is turned off by the next pulse synchronized with the oscillator output. MC34063ADR2G can form a power inverter, buck converter and switching boost converter with minimal external components. To ensure safe delivery and allow for quick installation of this component after delivery, we will use tape and reel packaging during shipping.
Alternatives and equivalents:
• It is manufactured by Onsemi.
• Its operating temperature is 0°C to 70°C.
• Its operating voltage is 3V to 40V.
• Its installation method is SMD or SMT.
• Its switching frequency reaches 100 kHz.
• It has eight pins and comes in SOIC package and Tape & Reel (TR) packaging.
• Its topology includes boost, buck and inverting.
• The dimensions of MC34063ADR2G are 5 mm in length, 4 mm in width, and 1.5 mm in height.
• It belongs to the category of switching voltage regulators.
The MC34063ADR2G operates on the principle of a bipolar transistor. It incorporates a temperature-compensated bandgap reference source, a duty cycle-controlled oscillator driver, and a high-current output switch. These components collectively enable the DC-DC converter's control function. Among them, the temperature-compensated bandgap reference source provides a stable reference voltage for the circuit to ensure the accuracy of the output voltage. The oscillator produces periodic pulse signals that regulate the switches' duty cycle, facilitating voltage conversion. The high-current output switches are capable of outputting up to 1.5A to meet the needs of various applications.
Specifically, when the input DC voltage is applied to the primary winding of the switching transformer through the switching tube, the voltage induced in the secondary winding of the switching transformer is rectified and filtered into a DC output voltage. The pulse signal at the base of the switching tube is generated by the timing element, comparator and positive feedback circuit. As the output voltage fluctuates, the positive feedback circuit and comparator adapt the pulse signal, thereby altering the duty cycle of the switching tube and ensuring the stability of the output voltage.
The above pictures are the symbol, footprint and pin configuration of MC34063ADR2G.
1. The advantages of MC34063ADR2G are as follows:
(1) Adjustable output voltage: it is a chip with 2G adjustable output voltage, users can adjust to the desired voltage value according to their needs.
(2) Low standby current: It has the characteristic of low standby current, which can effectively reduce power consumption and prolong battery life.
(3) High operating frequency: The MC34063ADR2G has an operating frequency of up to 100 kHz, which enables fast conversion and reduces circuit size and weight.
(4) Compliance with environmental standards: The MC34063ADR2G is lead-free, halogen-free and RoHS compliant, making it an environmentally friendly chip.
(5) Wide operating voltage range: The device has an extremely wide operating voltage range from 3V to 40V, enabling it to operate flexibly over different input voltage ranges, providing wide applicability for a variety of application scenarios.
(6) Current limit function: It has a current limit function that protects circuits from over-current damage.
(7) High performance: MC34063ADR2G has a high-precision temperature compensation bandgap reference source to ensure the stability of the output voltage. At the same time, the design of its duty cycle control oscillator driver and high-current output switch enables the chip to achieve reliable control.
2. The disadvantages of the MC34063ADR2G include the following:
(1) Long conversion time: The device has a long conversion time, so it may not be the best choice for applications that require fast conversion.
(2) Poor load following: In some applications, its output voltage may be unstable when the load current changes.
(3) Insufficiently high operating stability: In high-pressure and high-temperature environments, the operating stability of the MC34063ADR2G may be affected.
It adopts advanced manufacturing technology and has high performance and reliability. Therefore, it is widely used in various fields, such as LED drives, household water pumps, smart grids, smart grids, switching power supplies, surface treatment equipment, battery protection, and various precision measurement detectors, etc.
Problem One: Inaccurate Output Voltage
The output voltage of MC34063ADR2G may be affected by external components or circuit design and become inaccurate. We can adjust the parameters of external components, such as the resistance value of the feedback resistor, according to the circuit requirements to ensure that the output voltage is accurate. At the same time, we should check whether there are any problems with the circuit design, such as power path, grounding, etc.
Problem Two: Protection Mechanism Failure
The protection mechanism of MC34063ADR2G may fail due to various reasons. We should check whether the related components of the protection mechanism such as over-current protection resistor and over-voltage protection components are working properly. At the same time, we should check whether the software algorithm of the protection mechanism is correctly implemented.
Problem Three: Unstable Power Supply
The device has high requirements on power supply, usually requires a stable and good power environment. Due to power fluctuation, bad power filter, etc., the circuit may work abnormally. To ensure proper operation of the MC34063ADR2G, we need to use a stable power supply and perform power filtering when needed.
Problem Four: Overheat Protection
The MC34063ADR2G is a chip with overheat protection, which automatically shuts down when the chip temperature is too high. In order to ensure the normal operation of the chip, we should check the heat dissipation of the circuit and add heat dissipation measures such as heat sinks or fans if necessary. At the same time, we also need to check whether the circuit has overcurrent or short circuit and other abnormalities.
Problem Five: Abnormal Power-down Protection Function
MC34063ADR2G has a power-down protection function, which will automatically shut down when the input voltage is too low or too high. We should check whether the power supply voltage is within the normal range and ensure the stability of the power supply voltage. At the same time, we should check whether there is any abnormal condition in the circuit, such as short circuit or open circuit.
Problem Six: Insufficient Driving Ability
In some occasions, MC34063ADR2G can not meet the higher load requirements due to its own poor driving performance. We can choose appropriate driving components for different needs, such as the use of electronic tubes, driver wafers, etc., in order to improve its driving performance. At the same time, we should pay attention to the design of the lines, such as power supply lines, grounding, etc.
Problem Seven: Difficulty In Starting
MC34063ADR2G will have starting difficulty in some occasions. There are two reasons for this, one is the failure of other devices, and the other is a problem in the circuit design. We have to check other components in the circuit, especially those related to starting. In addition, we have to pay attention to the design of the circuit, such as the power supply line, grounding and so on.
Frequently Asked Questions
1. What is the function of the MC34063?
The MC34063 was designed to be incorporated in buck, boost, or voltage-inverter converter applications. All these functions are contained in an 8-pin DIP or SOIC package. The reference voltage is set at 1.25 V and is used to set the output voltage of the converter.
2. What is the purpose of the MC34063ADR2G IC?
The MC34063ADR2G is a versatile voltage regulator IC designed to regulate and control the output voltage of electronic circuits. It can be used in various configurations, including step-up, step-down, and inverting modes.
3. What is a voltage regulator do?
A voltage regulator is a circuit that creates and maintains a fixed output voltage, irrespective of changes to the input voltage or load conditions. Voltage regulators (VRs) keep the voltages from a power supply within a range that is compatible with the other electrical components.
4. What are the typical applications for the MC34063ADR2G in inverting mode?
In inverting mode, the MC34063ADR2G can be used to generate a negative output voltage. This is often employed in applications where a negative voltage supply is required.
