UCC38C42D

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UCC38C42D is an integrated circuit that combines a PWM (pulse-width modulation) controller with all the necessary control, protection and drive components, into a single monolithic switching regulator. This chip is part of the UCC38Cx family, a group of fixed frequency single-ended flyback PWM controllers from Texas Instruments that are used to design constant-voltage and constant-current offline electronic power converters. It is one of the most sought after Offline Switcher chips by electronics manufacturers due to its outstanding performance, excellent power efficiency, fast response behavior and overall process optimization.

When applying UCC38C42D offline switchers, a buck or boost converter is needed to regulate the voltage according to the needs of both the output voltage and current. In constant-voltage mode, an external resistor and capacitor are used in the feedback loop to determine how much the output voltage will be regulated. In the constant-current mode, an expert clamp in the feedback loop is used to set the maximum current that the switch can provide. Also, the chip includes short-circuit protection, over-temperature warning and brown-out protection.

UCC38C42D offline switchers also feature a skip cycle operation at light loads for high efficiency and low quiescent current operation. This mode eliminates the unnecessary cycle-by-cycle oscillations of the internal clock, switching off the oscillator so that the chip consumes less current when in standby. Another remarkable feature of the UCC38C42D is the open-loop soft-start capability that prevents inrush currents on power-up and minimizes the input peak current while increasing the output power gradually.

These converters are used in a wide range of consumer electronics products, from AC adapters and USB chargers for smart phones, tablets and laptops to industrial automation, power tools and medical supplies. Since output power is regulated accurately, it is reliable and perfectly safe for a wide range of sensitive electronic devices. Furthermore, UCC38C42D’s operating range is from 90 to 265VAC and its switching frequency is fixed at 100 kHz, making it one of the most versatile and cost effective solutions for advanced offline electronic devices.

In summary, UCC38C42D is a highly efficient and cost effective offline switcher IC that offers outstanding performance and robust protection features. It allows designers to customize the converter’s output voltage and current to meet their specific needs. Additionally, the device’s soft-start capabilities enable the production of stable and accurate power supplies, while its high-frequency switching minimizes the size and total operational cost of the final product.

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