SI8273GB-IS1

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Isolators are components which allow for the coupling of electrical signals between two isolated circuits. They are primarily used in applications where galvanic isolation from a higher voltage circuit is required. Gate drivers, in particular, are components which isolates the high-voltage side from the low-voltage side and provide a high-current output which aids in the switching of power transistors.

The SI8273GB-IS1 is a high-voltage single-channel 2-wire isolated gate driver, designed to provide efficient and accurate control of gate-turn-on/off sequences. This device is capable of delivering up to 10 A peak current as well as 30V-breakdown voltage ratings and up to 5kVrms reinforced isolation. The SI8273GB-IS1 is suitable for both bridge topologies and direct-power MOSFETs applications.

Applications

The SI8273GB-IS1 gate driver can be used in wide range of industrial applications, such as motor control, high-power lighting and power supplies. It is specifically designed for driving bridge topologies, including switched-mode power supplies (SMPS), automotive, automotive inverters, ac-dc & dc-dc converters, LED lighting and other applications which require higher voltage isolation.

In addition to this, the SI8273GB-IS1 is also suitable for direct-power MOSFETs applications, meaning it is capable of driving MOSFETs such as Si49 with no other external components. This makes the device a highly stable and reliable solution for advanced motor control and power supply designs.

Working Principle

The SI8273GB-IS1 driver utilizes galvanic isolation techniques to physically separate the high-voltage side from the low-voltage side. This is done by using an electrical transformer to provide power insulation between the two sides. The high-voltage side is electrically isolated from the low-voltage side, providing up to 5kVrms reinforced isolation performance.

On the low-voltage side, the gate driver contains a logic input which is used to control the gate-turn-on/off sequence. This is then sent to the primary of the isolation transformer, which converts the signal to an electrical form and sends it to the secondary winding of the transformer.

On the high-voltage side, the electrical signal is amplified by a power switching FET, which is used to provide a high-current output which aids in the switching of power transistors. The SI8273GB-IS1 also includes an enable/disable input, providing additional flexibility to the user.

Conclusion

The SI8273GB-IS1 is a high-voltage single-channel 2-wire isolated gate driver designed for driving bridge topologies and direct-power MOSFETs applications. This device is capable of delivering up to 10 A peak current as well as up to 5kVrms reinforced isolation. It is suited for a variety of applications, including motor control, high-power lighting, power supplie, SMPS, automotive, automotive inverters, ac-dc & dc-dc converters and LED lighting.

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