UCC28950PWR Integrated Circuits (ICs)

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The UCC28950PWR is a multi-channel, idle-mode PWM controller specifically designed in an advanced BCDMOS process to enable high performance and high efficiency synchronous DC/DC buck converter applications. It improves system reliability and accuracy by accurately monitoring and controlling voltage, current, and temperature in the system.

The UCC28950PWR belongs to the PMIC (Power Management IC) family, more specifically to the Voltage Regulators category, and finally to its subset, the DC DC Switching Controllers.

The UCC28950PWR is built using a 0.35um BCDMOS process, patented PrimAccurate™ modulation, comprehensive fault protection and real-time current sensing with in-package local power resistors. This is used in combination with the on-chip LDOs and advanced FET drivers to deliver high performance and high efficiency for synchronous buck converter designs.

The UCC28950PWR is primarily targeted for applications requiring high current delivery, high efficiency and high reliability including Point-of-Load (POL) boards, adjustable current sources, redundant output power solutions, and server DC/DC converters.

When it comes to features, the UCC28950PWR is able to provide system stability, real-time voltage, current and temperature protection, optimized switch-mode PWM performance, and support for application-level diagnostics and monitoring through I2C interface.

The primary working principle of the UCC28950PWR is Synchronous Buck PWM Control. Synchronous buck PWM control maps load current directly to the power stage gate drive, regulating the load with virtually no loss. The buck converter implemented with a UCC28950PWR uses external power MOSFETs to switch a current from the input to the output, which generates a controllable output voltage.

This process works as follows. A clock signal is used to synchronize the PWM, and based on the duty cycle, the output voltage can be adjusted. A power MOSFET switch is opened and closed, sending current from the input source to the output. The duty cycle of the pulse width can be used to control the output voltage. If the duty cycle is low, the output voltage will be low, and if the duty cycle is high, the voltage will also be high.

The UCC28950PWR supports adjustable-frequency operation, making it suitable for many fast-switching applications. The regulation loop is able to compensate for fast-changing loads with the use of an error amplifier, while system protection features control output voltage and current when necessary. If an uncontrolled or short-circuited output occurs, the output will automatically be disabled and the system will enter a safe operating mode.

The UCC28950PWR comes with many voltage-sampling modules that monitor and adjust the output voltage as needed. Using the sampling modules, the controller can detect and respond to changes in the input and output. A temperature sensor is also included to protect the MOSFETs and other system components from thermal dangers.

Finally, the UCC28950PWR includes current sensing with in-package resistors and independent current limit settings. This ensures a highly efficient current delivery, which improves system reliability and accuracy. The current sense amplifier can also be used to determine the power dissipation.

In conclusion, the UCC28950PWR is a powerful and efficient multi-channel 0.35um BCDMOS process PWM controller designed for high-performance synchronous DC/DC buck converter applications. It provides system stability and high efficiency for fast-switching applications, and comes with temperature monitoring, adjustable frequencies, and current sensing modules. These features help to increase system reliability and accuracy.

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