UCC28610DR

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The Texas Instruments UCC28610DR is a synchronous offline buck switching regulator with overvoltage, overcurrent, and short circuit protection features. This IC is designed to be used in an isolated AC-DC switching power converter to produce a voltage suitable for digital and analog circuits. It is suitable for both NOV and PFC applications, with a switching frequency up to 500kHz and a wide input voltage range of 85VAC up to 375VAC.

The UCC28610DR is a low-noise, low-EMI single-stage, synchronous buck switching regulator for off-line applications, such as AC adapters and offline LED drivers. It has an integrated high-voltage switch and offers feedback accuracy of ±3%, programmable soft-start, and integrated control circuitry for overvoltage, overcurrent, and short circuit protection. The device can be used to optimize the power efficiency, reduce EMI signature, and improve product reliability through the use of advanced control techniques.

The UCC28610DR works based on the Buck topology. It takes the input AC voltage, rectifies it to a fixed DC voltage, which is then fed to a switch-mode power supply (SMPS) regulation circuit. This SMPS regulation circuit controls the output voltage by switching the power MOSFETs on and off at a specific frequency. This enables the UCC28610DR to produce a regulated voltage output at the desired level. The output voltage is monitored and controlled by a voltage feedback loop.

The UCC28610DR includes a built-in Adaptive Frequency Control (AFC) feature. This feature enables the device to switch at a higher frequency when the output power is low and switch at a lower frequency when the output power is high. This helps reduce EMI from the output stage and also increases overall efficiency. The AFC also helps reduce the published maximum power dissipation of the device.

The UCC28610DR also incorporates a programmable soft-start feature. This feature initializes the output voltage slowly and prevents high surge currents at start up. It also reduces the startup time and enables the system to smoothly transition from the startup to regulation state.

The UCC28610DR also features several protection mechanisms designed to protect the power MOSFETs and the output voltage. The input voltage overvoltage, output voltage overvoltage, adaptive overcurrent protection (AOCP), and single-stage overcurrent protection (OCP) features protect the device from faults and potentially damaging conditions. The AOCP monitors the output power and alters the current limit threshold when the output power is low. The OCP disables the output FETs when the current reaches a certain threshold.

The UCC28610DR is suitable for a wide range of AC-DC applications, such as NOVA and PFC switch mode power supplies. It is able to provide excellent performance and reliability in applications requiring high power density, wide input voltage range, high efficiency, and low noise. Due to its integrated control circuitry, advanced protection features, and Adaptive Frequency Control feature, the UCC28610DR is the right choice for many off-line applications.

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