UCC27221PWPR

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Gate drivers, as a special class of power ICs, are widely used to facilitate the control of the switching of the different voltage levels in a system. An important device often applied among these is UCC27221PWPR. This part is a general-purpose pulse-width-modulator (PWM) gate driver which integrates logic functions to drive high-current power FETs controlled by a PWM input signal.

The UCC27221PWPR gate driver features low on-resistance outputs for low-capacitance switching favorable for high-speed switching. The gate driver is designed to accept a wide range of input operating voltages from 2.5 V to 20 V. The maximum output load current is 3A, making this part suitable for high-side and low-side MOSFETs applications. It has a typical propagation delay of just 53 ns, ensuring the device responds to the input PWM signal without fail.

The UCC27221PWPR offers both low side and high side outputs. It operates with PWM inputs up to 25 MHz. This allows the device to respond quickly to changes in the PWM input, making this an ideal solution for driving high frequency power switches. Furthermore, the high side output can be configured to be pulsed mode or enable mode. This provides control over which MOSFETs are activated in a particular configuration.

The UCC27221PWPR has several features to ensure its safety and reliability. The over-temperature protection enables the device to protect itself from excessive temperatures. The built-in gates also provide protection against short-circuit and over-current conditions. The PWM voltage limiter prevents the PWM input signal from exceeding the rated voltage. The over-voltage protection provides shutdown if the output voltage exceeds the allowed limit.

The UCC27221PWPR employs an advanced current-sensing topology, which includes a power-switch, shunt regulator and control circuitry. The device draws current from the power-switch and adjusts the voltage of the internal shunt regulator automatically to provide the necessary operating current. The shunt regulator maintains a constant output voltage even when the input voltage is varying. This allows the device to provide the necessary current without under- or over-driving the switching FETs.

The UCC27221PWPR is a highly multi-functional gate driver suitable for a variety of different applications such as switching motor drives, DC/DC converters, LED drivers, solar inverters, and many others. Its wide operating voltage range and low on-resistance make it an ideal candidate for high-speed switching. Furthermore, its robust protection features make it ideal for driving high-power loads reliably and safely.

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