FAN73832N

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Power management integrated circuits, otherwise known as PMICs, are integrated circuits that specialize in management and optimization of voltage and power delivery to other circuits within an electric system. An important subgroup of the PMIC is the gate drivers, which play an important role in controlling integrated circuit switches — those switches controlling electric power going to the load. One of the most popular and commonly used gate drivers is FAN73832N, manufactured by Fairchild Semiconductor. The working and application fields of this chip are presented in the following paragraphs.

Application Fields

FAN73832N is a monolithic high-speed, high-side and low-side dual synchronous rectifier gate driver. This device is mainly designed for synchronous rectification in isolated power forward converter, especially in telecom and power supply applications. Its advanced process technology provides the device with precise gate output timing and lower prop delay, enabling faster switching speed. Moreover, it offers higher tolerance to power supply voltage than the typical previous generations of gate drivers and can operate stably up to 48V in reverse voltage.

Features

FAN73832N also features a wide variety of specifications that make it advantageous in various circuits. It has a supply current range of 22mA to 95mA and a range of board layout dimensions, making it suitable for both in-line and right-angle power applications. It features a minimum Channel-to-Channel Skew of 120ns, offering reliable tracking of both driver outputs. Moreover, it has a minimum delay time of 8.2ms, which leads to a noticeable decrease in steady-state power dissipation.

Working Principle

The working principle of FAN73832N involves the application of a voltage to the Gate-Source of the MOSFETs, which leads to the opening of the MOSFET and the distribution of power across the converter. The basic theory behind the synchronous rectification process involves the simultaneous use of both high-side and low-side MOSFET switches to improve diode rectification and enable more efficient power conversion. The FAN73832N provides two differential inputs from the converter, one for each high-side and low-side MOSFETs. Each input then triggers the voltage switch of the corresponding MOSFETs, so that the power is delivered to the load in a timely fashion.

The FAN73832N has been successfully used in various telecom, power supply and other applications where compact size and high speed of power distribution is required. Its ability to provide both high-side and low-side differential inputs as well as its high tolerance to reverse voltage make it a reliable choice for gate driving needs. It is also characterized by a low supply current and a minimum channel-to-channel skew time, providing reliable tracking between the two outputs of the MOSFETs.

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