SI82394CD4-IS

Rise / Fall Time (Typ):	12ns, 12ns (Max)
Approvals:	CQC, CSA, UR, VDE
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply:	12.8 V ~ 24 V
Voltage - Forward (Vf) (Typ):	--
Current - Peak Output:	4A
Current - Output High, Low:	2A, 4A
Series:	Automotive, AEC-Q100
Pulse Width Distortion (Max):	5.6ns
Propagation Delay tpLH / tpHL (Max):	135ns, 95ns
Common Mode Transient Immunity (Min):	35kV/µs
Voltage - Isolation:	5000Vrms
Number of Channels:	2
Technology:	Capacitive Coupling
Part Status:	Active
Packaging:	Tube

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Background and Overview

Isolators - Gate Drivers are used to interface between low-voltage, low-power logic devices (e.g. microprocessors) and high-voltage circuits (e.g. gate drives, power-flow stages, and protection subsystems). The SI82394CD4-IS is a four-channel, three-state isolated gate driver designed to provide high-side and low-side gate drive signals to four N-channel or P-channel power transistors. This isolated gate driver features integrated current-limiting protection to prevent system damage due to over-current and short-circuit faults. This article will discuss the application field and working principle of the SI82394CD4-IS.

Application Field

The SI82394CD4-IS is an ideal solution for industrial and commercial applications such as motor control, lighting control, HVAC/R, and automotive applications. This isolated gate driver offers high-side and low-side gate drive signals that can drive N-channel or P-channel MOSFETs or IGBTs with a maximum voltage of 55V and a maximum current of 8A. Additionally, the device offers an adjustable output current limit that helps to reduce the share of current that the gate driver must carry during short-circuit faults.The SI82394CD4-IS is also designed with a very low power dissipation, allowing it to be used in small form factor applications. The operating range is from 4.5V to 55V and it features under-voltage lockout for both logic and power supplies. The device also features output enable, fault flag, and thermal shutdown, as well as an integrated charge-pump driver and pull-down discharge circuit.

Working Principle

The working principle of the SI82394CD4-IS is based on a hybrid circuit featuring both level shift and isolation techniques. This innovative approach combines the reliability of an opto-isolator with the speed of a level shift circuit, allowing the device to switch faster than other similar devices. The device obtains its isolated supply voltage from the system power supply, rather than from a coil or transformer.The device consists of four MOSFET-type drivers, each with an internal supply voltage rail. The control logic is provided by an enabled signal and output enable pin, which can control up to four output channels. The signal is provided by an external device, such as a microprocessor or DSP. The output enable signal provides a logical high level to activate the gate drive signals. When the output enable signal is not present, the output is put in a high-impedance state.The final output of the SI82394CD4-IS is its gate-drive signal, which includes both high and low side gate drive signals. The high-side gate drive signal is used to turn on an N-channel MOSFET, as well as an IGBT of P-channel type. The low-side gate drive is used to turn off the same type of devices.

Conclusion

The SI82394CD4-IS is a four-channel, three-state isolated gate driver designed to provide high-side and low-side gate drive signals to four N-channel or P-channel power transistors. This isolated gate driver is commonly used in industrial and commercial applications such as motor control, lighting control, HVAC/R, and automotive applications. The working principle is based on a hybrid circuit featuring both level shift and isolation techniques, combining the reliability of an opto-isolator with the speed of a level shift circuit. The SI82394CD4-IS features an adjustable output current limit for over-current and short-circuit protection, as well as an output enable, fault flag, and thermal shutdown.

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