MC34063LBBGEVB

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MC34063LBB GEVB (General Electric Voltage Board) is a renowned off-line, DC/DC or AC/DC SMPS (Switch Mode Power Supplies) integrated circuit from Texas Instruments, which contains all the necessary components to construct a high-performance power conversion system. This versatile single-channel SMPS solution is well suited for numerous applications, such as LED lighting, industrial machinery, and consumer electronics.

The board comprises of a wide range of components, including an MC34063LBB DC/DC controller integrated circuit, an energy pot, an input filter, an opto-isolator, a rectifier, and a voltage regulator. This allows for easy prototyping and evaluation of the entire DC/DC solution, overcoming the need for breadboarding and optimizing the system without any external components or connections. This board contains a 12V voltage regulator that enables the user to drive the DC/DC current and also includes a 100K variable resistor to adjust the output voltage of the DC/DC converter.

The MC34063LBB SMPS solution has an I/O circuit that can accept AC or DC inputs, allowing for greater flexibility when designing a wide range of power conversion systems. The device contains a voltage loop feedback pin (Vref) that allows for precise control of the output voltage, resulting in a stable output power supply with excellent transient response. The solution also incorporates a frequency control loop (FCL) to enable the user to rapidly adjust the operating frequency of the power supply.

The MC34063LBB solution has a wide input voltage range of 4.5V to 24V and supports an output power range of 5V to 24V, with a peak current of up to 5A and a peak voltage of up to 40V. The solution features a low-current stand-by mode (< 1µA) for reduced power consumption when the device is not in use. The low quiescent current makes it ideal for battery-operated applications where power consumption needs to be kept low.

The board can be used in a wide range of applications, from automotive to IoT, and features both thermal protection and over-voltage protection. It also supports a wide range of temperature range, from -40°C to +125°C, making it suitable for use in a range of extreme environmental conditions, such as those found in outside electronics applications. The board also provides a few Pre-Bias Output pins, which allow for testing and determining the performance of the SMPS solution under different scenarios.

The working principle of the MC34063LBB solution is simple and straightforward. The device integrates a MOSFET driver, an oscillator, a controllable switching voltage regulator, and a current limiter into one integrated circuit. The device has two operating modes: Discontinuous Conduction Mode (DCM) and Continuous Conduction Mode (CCM). In DCM, the output voltage is regulated by a voltage feedback loop, and in CCM, the output current is regulated by a current-feedback loop.

When operating in DCM, the MC34063LBB solution uses a MOSFET switch to control the output voltage. During each switching cycle, the switch is driven high by the oscillator and the output voltage is held constant while the current is supplied to the load. Once the voltage reaches its target value, the switch is driven low to disconnect the load from the power supply. The time-dependent control of the switching voltage ensures a stable output voltage and eliminates voltage ripples in the power conversion system.

When operating in CCM, the MOSFET switch is also driven by the oscillator, however, the current is now regulated instead of the voltage. The device monitors the output current and adjusts the on-time of the switch to maintain the target current. The system compensates for a decrease in load current by increasing the on-time of the switch and vice-versa for an increase in load current.

The MC34063LBB SMPS solution provides a neat and simple solution for designing efficient power conversion systems. As it integrates all the necessary components onto a single board, it is easy to prototype and evaluate, while eliminating the need for any external components or connections. The variable resistor on the board also allows the user to adjust the output voltage of the converters with ease, and its wide input voltage range, extended temperature range, and excellent performance make it a suitable choice for a variety of applications.

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