UCC28710D

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The UCC28710D is a high-efficiency, high-isolation, quasi-resonant flyback controller designed to reduce system cost, size and complexity. It is widely used in the application field to generate the power needed for various AC/DC switching power supplies, offline switchers, and switch-mode supplies.

The UCC28710D uses Peak Current Mode Control techniques with Advanced Burst Mode features and can be optimized to address various system requirements while also reducing or eliminating EMI filtering components. Peak current mode control ensures a stable and reliable operation with programmable current and cycle-by-cycle current limiting. The on-chip Advanced Burst Mode provides cycle-by-cycle maximum duty cycle control and reduces power dissipation, improving the efficiency of the system and allowing the UCC28710D to operate with operating frequencies up to 700 kHz.

The UCC28710D can handle wide input voltage ranges, up to 300 V, and system output power requirements up to 25 W. The device features an on-chip startup regulator that simplifies the design and reduces external components. The UCC28710D also has an accurate temperature compensation and thermal shutdown protection.

It can achieve very high efficiency without compromising transient response and product safety. The UCC28710D is compliant with safety regulations and does not require external EMI chokes, allowing for a smaller and simpler design. The UCC28710D is suitable for offline applications up to 25 W with an operating frequency ranging from 40 kHz to 700 kHz.

The working principle of the UCC28710D consists of two stages: in the first stage, it senses the current on the primary side of the transformer, and in the second stage it calculates the necessary peak current signal based on the sensed current, which is then used to calculate the correct duty cycle and control the switch.

The peak current signal controls the switch, which is used to generate the short pulses needed to charge and discharge the transformer\'s primary winding. Once the energy stored in the transformer is released, it flows into the secondary side of the transformer, and the voltage is rectified and transformed by the rectifier and the output filter capacitor to provide the output constant voltage. This process is repeated, producing a continuous output.

In conclusion, the UCC28710D is ideal for AC/DC switching power supplies and offline switchers up to 25 W. It is a high-efficiency, high-isolation, quasi-resonant flyback controller which uses Peak Current Mode Control techniques with Advanced Burst Mode features to reduce system cost and size. The on-chip startup regulator and temperature compensation make the UCC28710D suitable for operations up to 300 V and frequencies up to 700 kHz. Moreover, the UCC28710D does not require external EMI chokes, allowing for a smaller and simpler design.

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