MC33063ADE4

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The MC33063ADE4 is an integrated, current-mode, pulse-width modulation (PWM) voltage regulator from ON Semiconductor, capable of controlling both positive and negative voltages. The device can source and sink up to 1.5 A of continuous output current. It is available in an 8-pin SOIC package, and is suitable for a range of applications including high-current, high-side and low-side switches, and power supplies.

The regulator can accept input voltage to operate, and is able to maintain a fixed output voltage even if the input voltage level changes. It features an over-temperature protection and over-current protection, which can help ensure a safe, reliable performance in a variety of applications. It also has a low power consumption rating, making it ideal for a host of battery-operated applications.

The MC33063ADE4 is an ideal solution for a number of application areas, such as automotive, telecommunications, and consumer markets. Its multi-mode control structure and internal gain setting circuitry make it well-suited for use as a DC-DC switching regulator. It can be used to control current in AC and DC motors, light-emitting diodes (LEDs), relays, and relay/DC motor circuits.

The MC33063ADE4 works through the application of current-mode PWM control, with active current-balancing in each switching cycle. The switching cycles are synchronised by an externally-applied pulse. The pulse width is modulated by the internal error amplifier to maintain the voltage level at its output. High frequency switching techniques enable the regulator to output a constant current and provide a limited energy buffer.

Therefore, the maximum output voltage is set by an external resistor and the regulation voltage is maintained by the internal error amplifier. The regulation point, ripple rejection, and current limit can be adjusted for each application by changing the external resistor value. The MC33063ADE4 can also be used as a synchronised switching regulator in multiple-output applications to minimise the size of the synchronisation transformer and to better meet design objectives.

Finally, the MC33063ADE4 features a junction temperature sensor that gives the device an added advantage of automatically increasing the duty cycle when the device’s junction temperature rises. This feature helps ensure that the device continues to operate safely even at higher temperatures.

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