UC3638QG3

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The UC3638QG3 is a high-performance, PWM-controlled, forward-assisted, peak-current-mode, buck-converter controller. It is designed to regulate current in wide-range DC motors, such as DC brushless motors, DC brushed-motors, and DC spindle motors. This device is part of the PMIC - Motor Drivers, Controllers family of motor control solutions from Texas Instruments. It is characterized by high performance and efficiency and a wide input voltage range.

The UC3638QG3 offers exceptional performance in terms of simplicity and flexibility. It supports both a natural PWM as well as a peak-current-mode regulation. The device includes a built-in boost drive circuit to provide high-current drive pulses to the motor. The integrated Hall-effect interface allows for current sensing and is compatible with standard Hall effect sensors. The device also features an integral soft start circuit to ease start-up current, and programmable over-current protection.

The UC3638QG3 device requires only a few external components to provide robust operation. It can operate at switch frequencies up to 500 kHz, making it ideal for high-power applications. The device is available in an 8-lead VSSOP package with a maximum junction temperature of 165 °C, making it suitable for most industrial applications. The UC3638QG3 is also AEC-Q100 qualified for automotive applications.

The UC3638QG3 device works by generating a PWM signal from an internal oscillator. This PWM signal is then used to control the output voltage of the device. The internal PWM circuit is set up to use either a natural frequency or a peak-current-mode regulation. The built-in boost drive circuit provides a high-current pulse to drive the motor when necessary. The current to the motor is sensed with the integrated Hall effect interface, which is compatible with standard Hall effect sensors.

The UC3638QG3 features an integral soft start circuit to reduce start-up current and programmable over-current protection. The device can operate at switch frequencies up to 500 kHz, and the available package (8-lead VSSOP) allows for easy prototyping. Additionally, the device offers a wide input voltage range of 6.5 V to 28 V, making it suitable for a variety of applications. The low power consumption of the device also makes it ideal for low-power applications.

In conclusion, the UC3638QG3 is the ideal device for controlling current in wide-range DC motors, such as DC brushless motors, DC brushed-motors, and DC spindle motors. It offers exceptional performance in terms of simplicity and flexibility, and its wide input voltage range and integrated Hall effect interface make it ideal for a variety of applications. Additionally, the UC3638QG3 is AEC-Q100 qualified for automotive applications.

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