UCC3961D

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UCC3961D is a type of DC-DC switching controller, which belongs to the category of Voltage Regulators in the field of Power Management Integrated Circuits (PMICs). It is a fixed-frequency switching controller with low-ripple force-induced sleep mode. UCC3961D consists of a low-ripple linear regulator, an oscillator, a fixed frequency PWM controller, a pulse strecher and a power MOS driver.

The linear regulator builds a reference voltage of 2.5V, as the regulation of output voltage, and provides the voltage with relatively low noise. The oscillator is a free-running digital circuit, generating a fixed frequency clock which is used as the switching rate of the power MOS switch. The PWM controller is based on this digital frequency, integrating a voltage feedback comparison circuit and a dead-time-adjustable PWM generator. The pulse strecher extends the off-time of the switch, allowing it to work in the soft-start and integral-cycle-by-cycle current-limiting modes. A MOS driver is a high-voltage, high-current capacity circuit, networked right before the power MOS switch, enabling the reliable operation of the power MOS switch under harsh conditions.

UCC3961D is featured with accurate, high-precision control of output voltage, wide-range voltage regulation, superior power conversion efficiency, protection against input and output overvoltage, and various fault conditions. With its built-in hysteretic current loop, it is able to provide accurate feedback control even with a highly-regulated input voltage. It also operates with input voltages ranging from 4.5V to 32V, enabling the power switch drives discrete MOSFETs or NFETs.

UCC3961D can be used for a wide range of applications including buck converters, forward converters, flyback converters, or other DC-DC converters. In buck converters, UCC3961D supports input voltage above and below the output voltage, while offering maximum output current up to 6A and wide-range protection function. It is also able to process high switching frequency, supporting up to 2MHz, but expecting the external components to work properly and without interference. In flyback converters, UCC3961D eliminates the need for opto-couplers and expensive inductors, and supports multiple outputs with maximum output current of 6A.

UCC3961D offers several advanced functions such as via external pin options and on-chip programming registers. For example, the PROG_SYNC pin is a dual-function pin allowing switching frequency synchronization between two devices, while the SS pin switch is used to select soft-start and input voltage-tracking in a single-ended forward converter. Moreover, it is able to be programmed to support a variety of control modes like low-noise, low-ripple sleep mode, frequency doubled mode and single channel high-voltage isolation mode.

In conclusion, UCC3961D is designed to provide the most advanced features and serve as the most integrated, cost-effective and best-performance solution for power conversion management. From its highly regulated output voltage to its basic fault protection, UCC3961D has been praised for its versatility, performance, and cost-effectiveness, making it a popular choice among all types of switch-mode power conversion applications.

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