ADUM3221ARZ

Series:	iCoupler®
Packaging:	Tube
Part Status:	Active
Technology:	Magnetic Coupling
Number of Channels:	2
Voltage - Isolation:	2500Vrms
Common Mode Transient Immunity (Min):	25kV/µs
Propagation Delay tpLH / tpHL (Max):	60ns, 60ns
Pulse Width Distortion (Max):	--
Rise / Fall Time (Typ):	20ns, 20ns
Current - Output High, Low:	--
Current - Peak Output:	4A
Voltage - Forward (Vf) (Typ):	--
Voltage - Supply:	4.5 V ~ 18 V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Approvals:	CSA, UR, VDE
Base Part Number:	ADUM3221

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The ADUM3221ARZ is an isolated half-bridge gate driver with a 3.3V galvanic isolated input. It is capable of driving two high side/low side N-channel power MOSFETs or IGBTs with a controlled switching frequency from 2kHz to 16kHz. This chip is particularly suitable for applications such as photovoltaic inverter and motor drive, which use high isolation voltage.Application FieldThe ADUM3221ARZ can be used in a wide range of applications from low voltage drives, industrial, HVAC motor, motor drives to photovoltaic inverter applications. The driver is designed to operate within the 3.3V range and can be used in applications requiring isolation up to 1500Vrms. It can drive two high side or two low side N-Channel MOSFETs or IGBTs with a controlled switching frequency range from 2kHz to 16kHz.The driver is compatible with the following protocols: PWM, Sine-bridge, Resonant or Linear-Load. Due to its versatility, the ADUM1221ARZ can be used in a variety of high voltage applications, such as switched-mode power supplies, solenoid control, and variable speed motor drives. The driver is also capable of providing a current sensing feature using a power MOSFET or IGBT as a current sense resistor, allowing direct current control of motor speed for industrial applications.Working PrincipleThe working principle of the ADUM3221ARZ is based on two two-channel gate drivers – one for the high-side MOSFETs or IGBTs and one for the low-side devices. The two channels are galvanically isolated with an isolation voltage up to 1500V for the load circuit, ensuring the safety of the system.The signal input is coupled capacitively through the 3.3V supply, and a regulated voltage source at 3.3V is provided for gate-source voltage of the MOSFET. A regulated PWM or Sine-bridge input is required for the high-side and low-side drivers to control the current in the load circuit. The ADUM3221ARZ can employ a tuned oscillator to set the switching frequency, or by external components in a low frequency environment. This chip is also capable of providing an adjustable maximum on time to reduce switching losses and reduce current ringing.ConclusionThe ADUM3221ARZ is ideal for applications with high current, high isolation, high power density and fast switching. It enables engineers to build reliable, easy-to-operate systems for switched-mode power supplies, industrial motor speed control, HVAC motor control, solenoid control and photovoltaic inverter applications. The underlying working principle of the driver allows it to be used with a wide range of protocols for a variety of high voltage applications.

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