UCC3895NG4

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The UCC3895NG4 is an integrated circuit (IC) from Texas Instruments (TI) and it is commonly used in power management applications like offline switchers and AC/DC converters. The chip is an off-line switching regulator containing all of the necessary components for the implementation of isolated applications using flyback and half-bridge isolating topologies.

The UCC3895NG4 is a PWM current-mode controller in a low profile surface-mount package with an improved pinout. The maximum output power of the chip is up to 94 W and features overvoltage, line undervoltage lockout, frequency foldback, cycle-by-cycle current limiting and thermal shut-down protection.

The operating frequency range is from 100 kHz to 400 kHz. The line undervoltage lockout, or UVLO, is selectable with 10 V, 15 V and 18 V ranges. The chip also provides an adjustable soft-start, a self-biased supply as well as configurable dead time control, or DEFTM.

The working principle of the UCC3895NG4 IC is quite simple. When enabled by an external control signal, the chip turns on its internal DMOS switch. The internal switch then converts AC mains voltage to the required DC voltage for the desired load. The switching is done by changing the open and close times of the internal switch. These times are set by the on-chip oscillator and error detection circuit. The oscillator sets the frequency of the switching, while the error detection circuit adjusts the duty cycle of the internal switch in order to achieve the desired output voltage.

The UCC3895NG4 is mainly used in applications such as variable speed drives, AC/DC power supplies, isolated DC/DC converters, PC and other keypad-type power supplies, low power consumer electronics and power adapters. It is an ideal chip when smaller size and greater power supplies are needed.

Due to its high power conversion efficiency and minimum noise, UCC3895NG4 ICs are now widely used in applications such as constant voltage, constant current and low power variable speed drives. The unit features the aforementioned overvoltage, line undervoltage lockout, frequency foldback, cycle-by-cycle current limiting and thermal shut-down protection for greater safety in a wide range of applications.

In summary, the UCC3895NG4 is an ideal device for low power AC/DC offline converters and switchers. It has integrated features like adjustable overvoltage and line unervoltage lockout, frequency foldback, adjustable DEFTM, and cycle-by-cycle current limiting. With the small package size and high power conversion efficiency, it is an excellent choice for applications needing both small size and higher power levels.

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