UCC3813PWTR-3

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UCC3813PWTR-3 is a cost-effective high-side power switch controller capable of driving MOSFETs and switching linear pass element, such as bipolar transistors, in a wide range of application areas. These include motor-controller applications, load current sensing and current limiting, lamp supervision and dimming, auxiliary supply applications, and flyback, forward and synchronous rectification.

The UCC3813PWTR-3 operates from 5.5V to 18V, and can withstand load voltage up to 80V. In addition, the UCC3813PWTR-3 includes a Power OK Output with a low logic threshold and sense resistor biasing, features that make it suitable for automotive and other low voltage applications. It also provides a Power rail down output to detect insufficient input power when using lower input voltages and a detect output to indicate a current limit condition.

Application Field

This device is used for switching MOSFETs and switching linear pass element, such as bipolar transistors, in a wide range of applications. Applications include motor controllers, current sensing, lamp supervision and dimming, auxiliary supply applications, and flyback, forward and synchronous rectification.

The device is designed to operate with 5.5V to 18V, and can withstand load voltage up to 80V. In addition, the UCC3813PWTR-3 includes a Power OK Output with a low logic threshold and sense resistor biasing.

This lets the device have a wide range of uses in the automotive industry, such as for motor control, load current sensing and current limiting, dimming and other applications. The Power rail down output can also be used to detect insufficient input power when using lower input voltages. The device has a detect output to indicate a current limit condition.

Working Principle

The UCC3813PWTR-3 provides a simple, yet robust, motor control circuit for controlling up to three motors. It has two distinct operating states. The first is the running state, and the second is the start-up state.

In the running state, the drive logic block drives the power MOSFET gate, which controls the motor’s direction and speed by switching on or off the drive current. The logic block also monitors the motor’s current and voltage levels, and can shut down power to the motor if it exceeds a preset limit.

In the start-up state, the controller monitors the motor’s power supply voltage, and once it has reached a certain level, the controller draws current from the power supply to drive the motor’s gate. After the motor has been driven at its peak voltage, the controller reduces the voltage across the gate, allowing the motor to spin freely.

The UCC3813PWTR-3 also provides two control signals, an enable signal, and a reset signal. The enable signal enables the logic block to drive the power MOSFET gate, while the reset signal disables the logic block. This allows the logic block to be turned on or off to provide the necessary level of control over the motor.

The UCC3813PWTR-3 also includes a detect output for indicating current limit conditions. The detect output goes low when the device senses that the motor’s current levels have exceeded its preset limit.

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