SI82398AD-IS

Isolators have long been the go-to form of electrical isolation, offering a wide range of applications from HVAC, process automation, instrumentation and industrial control to communications, medical equipment, military radio equipment, and even in aircraft.

The SI82398AD-IS is a RoHS-compliant, bidirectional, galvanically isolated, low-side gate driver from Silicon Labs. It provides ±60V of isolation, and has 2x 8V/25mA output stages. This device has a typical propagation delay of 10ns and a common-mode transient immunity of 10kV/μs.

Application Field

The SI82398AD-IS is primarily used in situations where high voltage sensing/control and isolation is required. It is applicable in a wide variety of industrial and automotive applications, such as motor control, LV switchgear, HVAC, power supply, battery management systems, and most recently in fast-charging solutions. It is also suitable for applications in the building automation, medical and military industries.

Working Principle

The SI82398AD-IS operates on a galvanically isolated full bridge structure, combining an H-bridge half bridge with a half bridge driver and balun transformer. The driver is capable of delivering up to 60V of isolation, and features two 8V/25mA outputs that switch in opposite directions. The device has an input that is typically 5V but can also operate on a low supply voltage of 2.5V. When an input voltage is applied, the device senses the change and initiates a logic level shift, which is then inverted by the driver. The transformed signal comprises of two positive and two negative outputs, which are then used to control the external circuitry. This enables the user to control the system while keeping a safe distance from the high voltage component.

The SI82398AD-IS also features a wide common-mode transient immunity of 10kV/μs, which allows the user to implement a high-voltage system without compromising noise margins. In addition, the device features a propagation delay of only 10ns, making it suitable for fast-switching applications. The device is rated for operation temperature ranges of -55°C to +125°C, making it suitable for automotive, industrial and even military conditions.

The SI82398AD-IS is a great fit for applications requiring galvanic isolation and high-voltage sensing/control. It offers the user a wide range of benefits, such as high-voltage isolation, fast-switching, reliable operation and a wide common-mode transient immunity.