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17 October 2018

CISSOID & GPT partner on SiC

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THEMIS

Gate Driver Controller for power switch

CHT-THEMIS is the controller block of the Power Transistor Driver solution CHTTHEMIS and CHT-ATLAS. The chipset is specifically designed to drive wide-bandgap power transistors, in particular Gallium Nitride (GaN) and Silicon Carbide (SiC) devices including normally-On and normallyOff JFETs, MOSFETs and BJTs. It is also used with standard silicon MOSFETs and IGBTs in standard temperature applications (e.g. 125°C) where it brings an increase in reliability and lifetime by an order of magnitude compared to traditional solutions. CHT-THEMIS can drive up to 5 CHTATLAS chips for very high power applications that require up to ±20A to the gate of the power device. It implements a state machine that manages the control and the fault signals, it embeds a voltage reference as well as a 5V linear voltage regulator which is used to supply CHT-ATLAS. This 5V power supply can also be used to power up other external circuits, such as the isolated transceiver CHT-RHEA for complete isolated gate-drive implementations. The circuit features an adjustable under-voltage lockout (UVLO) function with hysteresis as well as a de-saturation detection circuit. It also includes a pulse generation pre-driver to accommodate for Normally Off SiC JFET. CHT-THEMIS also features an active Miller clamping (AMC) function and predriver for an external transistor. 

Typical performances:

  • Temperature range: -55°C to 225°C
  • Supply Voltage: 5 to 30V
  • Adjustable Under-voltage lockout (UVLO)
  • De-saturation detection circuit
  • Active Miller clamping (AMC) support
  • Available Package: Ceramic SOIC28

 

Application

  • Intelligent Power Modules (IPM)
  • Power conversion, power generation and actuator controls in aeronautics
  • Solar inverters
  • Motor drives, battery chargers and
  • DC-DC converters in EV / HEV
  • Power conversion and motor drive in railway
  • Switched mode power supplies (SMPS)
  • Wind turbine power converters

An evaluation kit EVK-THEMIS-ATLAS implementing a high-temperature power transistor driver and controller based on CHT-THEMIS and CHT-ATLAS is available at Cissoid.


 

Ordering information

Product name Ordering reference Package Marking
THEMIS CHT-TIT9570C-CSOIC28-T Ceramic SOIC28  CHT-TIT9570C