UCC27517ADBVT

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UCC27517ADBVT application field and working principle

The UCC27517ADBVT is a member of Texas Instruments’ UCC27x17x family of high-speed, high-voltage gate drivers for switch-mode power supplies and industrial applications.

The UCC27517ADBVT specifically is a high-voltage gate driver which provides high-current and high-frequency switching capability with a peak output drive current of 5 A and a peak frequency of up to 2 MHz. The UCC27517ADBVT is typically used to drive power MOSFETs, IGBTs, and power bipolar transistors in both standard and low-side output circuit configurations.

Gate Drivers are ubiquitous devices in the world of power electronics and are used to control and switch on/off power MOSFETs, IGBTs, power bipolar transistors and other power devices. Generally speaking, gate drivers provide the required current at the desired frequency to ensure adequate switching of the power devices. In many cases, gate drivers can also provide additional features such as under-voltage, over-voltage, over-temperature protection and reverse current protection.

The operation and functionality of gate drivers, such as the UCC27517ADBVT, can be broken down into two distinct categories: the input stage and the output stage. The input stage is responsible for providing the control logic signals that dictate the operation of the power device. These signals are typically low-voltage (3.3V or 5V), high-speed (up to 100 kHz) digital logic signals and can originate from a variety of sources. These inputs are generally referred to as ‘enable’, ‘disable’, or ‘shutdown’ signals.

The output stage of the driver is responsible for providing the required mechanical drive current and electrical breakdown protection for the power device. In order to provide this current, the driver must be able to provide a wide range of output voltage/current combinations. Generally, the range is characterized by an upper rail voltage and a lower rail voltage. For the UCC27517ADBVT, these rail voltages are 30V and – 12 V, respectively. Using these two voltages as reference, the output stage has the capability to supply 1.7 A +1.7 A – for each of the two output channels.

In order to provide the required current, the output stage must also be able to provide various output frequency combinations. These frequency combinations are typically in three ranges. For the UCC27517ADBVT, these frequency ranges consist of a low range (up to 250 kHz), a mid-range (up to 1 MHz), and a high range (up to 2 MHz).

The selected frequency combination is determined by the input logic signal and will determine the amount of current supplied to the power device. The current supplied to the power device can be controlled by the input logic signal in order to reduce the current drawn by the power device and thereby reduce the power dissipation of the driver.

In summary, the UCC27517ADBVT is a high-voltage, high-performance gate driver used to drive power MOSFETs, IGBTs, and power bipolar transistors in both standard and low-side output circuit configurations. The UCC27517ADBVT provides a peak output drive current of 5 A and a peak frequency of up to 2 MHz. Additionally, the UCC27517ADBVT provides various output voltage/current combinations and frequency combinations to provide the required current and protection for the power device.

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