TOP258GN

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TOP258GN is an offline switch controller that is capable of regulating an integrated switch. An offline switch is a type of power supply that can either be connected to the input power directly or alternately connected through an AC/DC converter circuit. TOP258GN can be used to provide regulated voltage outputs for many AC/DC applications including power inverters and buck converters.

TOP258GN is highly integrated and consists of an operational amplifier that provides enhanced performance, such as overload protection, over-voltage protection, primary side current sense and voltage sense. It also contains a 500V MOSFET driver to reduce the power dissipation.

The application field of TOP258GN includes uninterruptible power supply (UPS) systems, AC/DC motor drives, air conditioning systems and solar power inverters.

The working principle of TOP258GN is divided into two parts:

The first part is the start-up stage. At the start-up stage, the device employs a current source to source a large current for the primary switch to reach a steady state. When the current is detected by the current sense, the output will be connected to the primary switch to provide a low on-resistance.

The second part is the regulation stage. After the start-up stage, TOP258GN uses the output voltage regulation loop to regulate the output voltage. This is possible due to the combined actions of the voltage fed-forward, the gating signal shaping, the duty cycle signal shaping and the dead-time control.

TOP258GN can provide up to 300kHz switching frequency and up to 12V output. It has a high efficiency of up to 96% and a low ripple and noise of up to 40mVpp. It has internal over-voltage protection (OVP) and over-current protection (OCP).

In summary, TOP258GN is an offline switch controller that is highly integrated and capable of regulating an integrated switch. It has a wide range of applications including motor drives and solar power inverters. It is efficient and offers low ripple and noise as well as protection features such as OVP and OCP.

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