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GR1500JT17-263 Datasheet(PDF) 7 Page - GeneSiC Semiconductor, Inc. |
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GR1500JT17-263 Datasheet(HTML) 7 Page - GeneSiC Semiconductor, Inc. |
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7 / 9 page  GR1500JT17-263 Apr 2016 Latest version of this datasheet at: http://www.genesicsemi.com/commercial-sic/sic-junction-transistors/ Pg 7 of 8 B: Proportional Gate Current Driving For applications in which the GR1500JT17-263 will operate over a wide range of drain current conditions, it may be beneficial to drive the device using a proportional gate drive topology to optimize gate drive power consumption. A proportional gate driver relies on instantaneous drain current ID feedback to vary the steady state gate current IG,steady supplied to the GR1500JT17-263 Voltage Controlled Proportional Driver The voltage controlled proportional driver relies on a gate drive IC to detect the GR1500JT17-263 drain-source voltage VDS during on-state to sense ID. The gate drive IC will then increase or decrease IG,steady in response to ID. This allows IG,steady, and thus the gate drive power consumption, to be reduced while ID is relatively low or for IG,steady to increase when is ID higher. A high voltage diode connected between the drain and sense protects the IC from high-voltage when the driver and GR1500JT17-263 are in off-state. A simplified version of this topology is shown in Figure 14, additional information will be available in the future at http://www.genesicsemi.com/commercial-sic/sic-junction- transistors/ Figure 14: Simplified Voltage Controlled Proportional Driver Current Controlled Proportional Driver The current controlled proportional driver relies on a low-loss transformer in the drain or source path to provide feedback ID of the GR1500JT17-263 during on-state to supply IG,steady into the device gate. IG,steady will then increase or decrease in response to ID at a fixed forced current gain which is set be the turns ratio of the transformer, h force = ID / IG = N2 / N1 . GR1500JT17-263 is initially turned-on using a gate current pulse supplied into an RC drive circuit to allow ID current to begin flowing. This topology allows IG,steady, and thus the gate drive power consumption, to be reduced while ID is relatively low or for IG,steady to increase when is ID higher. A simplified version of this topology is shown in Figure 15, additional information will be available in the future at http://www.genesicsemi.com/commercial-sic/sic-junction-transistors/. Figure 15: Simplified Current Controlled Proportional Driver |
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