UCC3889N

Duty Cycle:	--
Base Part Number:	UCC3889
Mounting Type:	Through Hole
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	--
Fault Protection:	Short Circuit
Frequency - Switching:	--
Series:	--
Voltage - Supply (Vcc/Vdd):	6.3 V ~ 9.3 V
Voltage - Start Up:	8.4V
Topology:	Flyback
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	Non-Isolated
Part Status:	Active
Packaging:	Tube

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UCC3889N Application Field and Working PrincipleUCC3889N is a unique integrated MOSFET driver with a bootstrap circuit technology. This device comes as a bridge driver primarily intended for universal ac/dc converters and offline switchers. It integrates a high-side and low-side power MOSFET driver and a soft-start circuit located on the same monolithic chip. The device features an adjustable operating frequency from 60 to 500 kHz and a controlled start-up voltage allowing a smooth system start and providing a low-EMI start-up sequence.The UCC3889N is part of Texas Instrument’s Power Management (PMIC) family, which covers a wide range of AC/DC converters, ranging from stand-alone converters for telecom and networking applications to AC/DC conversion arrays for use in automotive applications. UCC3889N particularly stands out from the others due to its features such as:• Robust, programmable MOSFET drivers in a single monolithic package• AC/DC and DC/DC switching up to 500 kHz• Soft-start circuit with current limit• Dual gate outputs with programmable slew rate • Low-EMI design• Low supply-current consumption• Low total-gate-charge consumptionThe UCC3889N is an ideal choice for applications that require high-level safety and reliability, such as personal computers, laptop adapters, mobile phones, and digital photocopiers. It functions through an efficient design to reduce the total gate charge consumption, thereby allowing for a low overall power consumption and improved device start-up.The UCC3889N functions based on a patented soft-start circuit and a dual gate driver architecture. Specifically, the soft-start circuit is composed of two parts: a dedicated soft-start capacitor connected to the driver’s input terminal and a voltage adjuster that ensures a controlled start-up of the output MOSFET. The dual gate driver features a high-side driver and a low-side driver, allowing a start-up sequence to be instantiated in both the high and low sides of the load simultaneously for reduced current consumption. Furthermore, the device also includes a programmable switching frequency and adjustable operating voltage.The UCC3889N is an important component in offline switchers, due to its integrated soft-start circuit and dual gate driver architecture. The full integration of these components into a single device allows for a compact, low-cost, and simple design. Furthermore, the soft-start circuit and dual gate driver architecture enables a controlled start-up sequence, reducing current consumption and improving reliability. The UCC3889N is a versatile device that can be used in a variety of applications such as AC/DC conversion and DC/DC conversion arrays. Since it is a full-featured monolithic component, it is easily scalable and customizable with the use of external components. Furthermore, the device provides improved reliability, due to its soft-start circuit and dual gate driver architecture. The UCC3889N is also extremely efficient in terms of total gate charge consumption, allowing for a low overall power consumption and improved device start-up. In summary, the UCC3889N is an ideal component for AC/DC converters and offline switchers, due to its unique features such as a soft-start circuit with current limit, dual gate outputs with programmable slew rate, low-EMI design, and low total-gate-charge consumption. It allows for a reliable and efficient system design, with reduced component count and cost. This makes it an ideal choice for applications that require consistent performance and power efficiency.

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