Analysis the complex tradeoff among Eon-VCEsat-SCSOA and EMI noise through the single chip evaluation method

As a compensation for the superior V CEsat , Carrier Stored Trench gate Bipolar Transistor (CSTBT™) has the more complex tradeoff among E on -V CEsat -SCSOA and EMI noise compared to IGBT. EMI noise evaluation is known to need special facilities such as a shield room and antenna detector, which deteriorates an evaluation efficiency and consistency. We found that EMI noise can be indirectly but simply and accurately evaluated by using the surge current under small current turn-on of single-chip IGBTs without any EMI shield facilities. By using this method, maintaining the CSTBT's better tradeoff among E on -V CEsat -SCSOA, we have succeeded to reduce the EMI noise by decreasing Carrier Stored Layer doping concentration and/or gate-collector capacitance while adjusting channel density.