TEA1721DT/N1

NXP  TEA1721DT/N1  芯片, 控制器, 开关电源, 700V, 1270HZ FBRST, 5W, 7SOIC

The is a Switched Mode Power Supply SMPS Controller IC for low power applications up to 5W and operates directly from the rectified universal mains input. The device includes a high voltage power switch 700V and has been optimized for fly-back converter topologies to provide high-efficiency over the entire load range with ultra-low power consumption in the no-load condition. It provides a circuit for start-up directly from the rectified mains voltage without any external bleeder circuits. The converter operates as a regulated voltage source from no-load up to the maximum output current and operates as current source that delivers the maximum current over a broad output voltage range. Using the TEA1721, a low power converter can be built with the minimum number of external components. The controller regulates the output voltage with primary-side sensing which eliminates the need for an additional secondary feedback circuitry and simplifies the design.

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Primary sensing for control of output voltage without optocoupler and secondary feedback circuitry

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Minimizes audible noise in all operation modes

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Jitter function for reduced EMI

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Very low supply current in no-load condition with energy saver mode

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Incorporates high voltage start-up circuit with zero current consumption under switching operation

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Overvoltage protection on feedback control pin with auto-restart

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Undervoltage lock-out protection on IC supply pin

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Over temperature protection

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Soft-start by reduced peak current for zero and low output voltage

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Demagnetization protection for guaranteed discontinuous conduction mode operation

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Open and short-circuit protection of the feedback control pin

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Short-circuit protection of the charger output

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700V High voltage power switch for global mains operation

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<22mW Enables no-load power consumption