UCC38083D

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The UCC38083D is a part of TI\'s Dual-Mode PWM IC family, designed for offline AC/DC flyback converters. It is a single-chip device that includes a primary-controlled power switch, maximum power point tracking (MPPT) with maximum peak inductor current control, an LDO controller, soft start control, protection functions, and integrated housekeeping functions.

The UCC38083D\'s primary application is to reduce the size of existing AC/DC flyback designs with the use of an integrated primary-side-regulating converter, while providing the same high performance. The device also works to simplify the design; catering to safety, functionality, and system performance requirements.

The UCC38083D\'s maximum power point tracking (MPPT) and maximum peak inductor current control (MPIC) help make AC/DC flyback converters cost-efficient. MPPT and MPIC work by optimizing the output power of the converter, by accurately controlling the output current and regulating the output voltage, instead of using an optocoupler for voltage feedback.

In a UCC38083D converter, the MPPT and MPIC operate in two phases: the first one is the highest power point tracking (HPPT) mode, and the second one is the maximum peak current mode (MPIC). In the HPPT mode, the device monitors the input voltage to make sure the power is always held within the highest efficiency range. The MPIC mode is used to control the current during the other phases of operation, to ensure that the power supply maintains the highest efficiencies at different loads and line voltages.

The UCC38083D also offers comprehensive protection functions such as open load protection, over load protection (OLP), short circuit protection (SCP), short voltage protection (SVP), over voltage protection (OVP), reverse current protection, and over temperature protection (OTP). With its fault logger, OLP, SCP, and OVP can also be used to trigger an alarm or SMBus event to inform system repsonses.

The UCC38083D integrates several features that simplify the design process for AC/DC flyback converters. The integrated LDO controller simplifies the design by eliminating the need for external components such as optocouplers, and allowing a single step start-up. The device also features a programmable soft start control and a low power sleep mode for added energy efficiency. The integrated housekeeping functions of the device provide protection against high and low line voltage, as well as transient events.

The UCC38083D is an ideal choice for designers who need a simple and effective solution for an AC/DC flyback converter. With its integrated dual mode control, maximum power point tracking and maximum peak inductor current control, it helps ensure maximum efficiency and consistent performance. The integrated protection and housekeeping functions help simplify design and ensure the highest level of safety and reliability, while the integrated LDO controller eliminates the need for external components, making it easier and cost-effective to use.

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