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Dual Isolated 4A Gate Driver (ADuM3220)

2017-02-25 05:54  
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isolated gate driver schematic This article describes the Dual Isolated 4A Gate Driver (ADuM3220). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: ADuM3220.

The ADuM3220/ADuM32211 are 4 A isolated, dual-channel gate drivers based on the Analog Devices, Inc., iCoupler? technology. Combining high speedCMOSand monolithic transformer technology, these isolation components provide outstanding performance characteristics superior to the alterna-tives, such as the combination of pulse transformers and gate drivers.

The ADuM3220/ADuM3221 provide digital isolation in two independent isolation channels. They have a maximum propaga-tion delay of 60 ns and 5 ns channel-to-channel matching. In comparison to gate drivers employing high voltage level transla-tion methodologies, the ADuM3220/ADuM3221 offer the benefit of true, galvanic isolation between the input and each output, enabling voltage translation across the isolation barrier. The ADuM3220 has shoot-through protection logic, which prevents both outputs from being on at the same time, whereas the ADuM3221 allows both outputs to be on at the same time. They both offer a default output low characteristic as required for gate drive applications. The ADuM3220/ADuM3221 operate with an input supply voltage ranging from 3.0 V to 5.5 V, providing compatibility with lower voltage systems. The outputs of the ADuM3220A/ADuM3221A can be operated at supply voltages from 5 V to 18 V. The ADuM3220/ADuM3221 specify the junction temperature from ?40°C to 125°C.

FEATURES
4 A peak output currentPrecise timing characteristics60 ns maximum isolator and driver propagation delay5 ns maximum channel-to-channel matchingHigh junction temperature operation: 125°C3.3 V to 5 V input logic4.5 V to 18 V output driveUVLOat 2.5 V VDD1 and 4.1 V VDD2Thermal shutdown protection at >150°COutput shoot-through logic protection on ADuM3220Default low outputHigh frequency operation: dc to 1 MHzCMOSinput logic levelsHigh common-mode transient immunity: >25 kV/μsEnhanced system-levelESDperformance perIEC61000-4-xUL 1577 2500 V rms input-to-output withstand voltage (pending)Small footprint and low profileNarrow body, RoHS-compliant, 8-leadSOIC5 mm × 6 mm × 1.6 mm
APPLICATIONS

Isolated synchronous dc/dc converters
MOSFET/IGBT gate drivers

 


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