LNK6405D

The LNK6405D is a 600 V, 4- Switch, Low Side and High Side Gate Driver with integrated isolation feature. This device is designed to interface directly with the popular Gate Turn Off (GTO) type power switches. It features a high slew rate and fast propagation delay to minimize switching losses in the power stage. The LNK6405D is designed for use in offline AC/DC converters, and offline DC-DC converters. This chip contains an integrated isolated supply input, allowing it to be used as a driver for both low and high side GTOs.

PMIC - AC DC Converters, Offline Switchers

LNK6405D Application Field and Working Principle

The LNK6405D is a critical component in offline AC/DC and DC/DC converters such as switch mode power supplies and telecom power supplies. It is used to control the switching action of GTOs in the power stages of these converters. This chip is designed to interface directly with the popular Gate Turn Off (GTO) type power switches, and has a high slew rate and fast propagation delay of 1 ns to minimize switching losses in the power stage.

The LNK6405D consists of an Input/ Output interface, an isolation circuit, a power on/off control, an enable circuit and several different components like resistors and capacitors. The Input/Output interface is designed for interfacing with the Gate Turn Off (GTO) type power switches, and contains both the gate drive input terminals, as well as the output terminals. The isolation circuit provides 5 kV of isolation between the input of the device and its output, providing both isolation and noise immunity in signal integrity applications. The power-on/off control is used for controlling the power up and power down of the device and contains both an enable signal and a shutdown signal. The Enable circuit controls the enable/disable signal which is used to enable/disable the chip at any time. Finally, the other components such as resistors and capacitors are used to protect the device from input negative voltage and ensure signal integrity.

Applying the principle of IGBT controlled AC/DC converters, the LNK6405D is utilized in the power stage as a gate driver for both low and high-side GTOs. The device is configured to provide both slewing rate and inrush current control. This allows it to be used as a driver for both low and high side GTOs in offline AC/DC converters, and offline DC/DC converters. The high speed of the device ensures that it can drive the GTOs quickly and accurately, allowing for quick and efficient switching in the power stages. Additionally, the integrated isolation feature helps improve system reliability and signal integrity.

In conclusion, the LNK6405D is an important component in the design of offline AC/DC and DC/DC converters, and is used to control the switching of GTOs in the power stages of these converters. It features a high slew rate and fast propagation delay to minimize switching losses in the power stage, and its integrated isolation feature helps ensure signal integrity.