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PMIC - AC DC Converters, Offline Switchers

PMICs, or Power Management Integrated Circuit, are integrated circuits that are used for managing the power of a system or device, such as a computer or a mobile phone. This type of integrated circuit is typically composed of one or more converters, control and monitoring circuits and voltage regulators.

One type of PMIC is the AC-DC converter, which is used for transforming alternating current to direct current. Commonly used for power supplies for electronic systems and other electronic devices, it can be used for powering multiple electronic systems from a single AC line voltage. The AC-DC converter typically consists of a transformer, rectifier, filter and regulator stages.

The transformer is used to step down the line voltage to the desired output voltage level, while the rectifier converts the AC voltage to DC. The filter circuit is composed of capacitors, inductors and/or resistors, and it provides a more steady voltage output. The regulator is used to maintain the output voltage at the desired level.

Another type of PMIC is the offline switcher, which is used for off-line applications, such as when a power supply is connected to the mains power. The offline switcher is typically composed of a control circuit, main switch, transformer, rectifier, filter, and an output voltage regulator. In an offline switcher, the control circuit is used to detect the momentary interruption or “trips” from the mains power. Upon detection, the main switch will open, and the transformer and rectifier will convert the mains AC voltage to DC voltage. Then, the filter circuit will smooth out the voltage, and the output voltage regulator will maintain the output voltage.

The TOP259LG integrated circuit is a universal off-line switcher for use in non-dimming AC/DC applications. This integrated circuit features an isolated current mode controller with a power switch that is designed to comply with the electromagnetic compatibility standard EN61000-6-2. This integrated circuit also features a switching frequency of up to 250kHz, soft-start and current limiting, over-temperature protection, electromagnetic compatibility, and an over-voltage protection feature. The TOP259LG also comes with an embedded thermistor feature, which is designed to provide improved system reliability and system protection.

The TOP259LG is ideal for off-line application such as PC power supplies, adapter and other non-dimming AC/DC applications. This integrated circuit provides superior performance, power dissipation and noise immunity, making it an ideal choice for power supplies and other off-line applications.

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