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AN2002 Datasheet(PDF) 6 Page - STMicroelectronics |
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AN2002 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 8 page AN2002 Using the Demoboard for the TD350 Advanced IGBT Driver 6/8 3 Application example no. 1 This first application example demonstrates the typical configuration in which TD350 can be used in low and medium power applications. In this configuration, the TD350 is able to drive IGBTs with current ratings up to about 50A. The schematic showing how to connect the demoboard to the optocoupler, power supply and IGBT module is presented on Figure 5. The demoboard doesn’t require any modification in order to be used in this configuration. However, it should be noted that C5 and C7 (decoupling capacitors for negative supply) are not needed in this example and they could be removed to optimize application cost and PCB space. The main characteristics of this example are: l Single Supply: with the benefit of the Active Miller Clamp feature, negative supply isn’t needed to avoid mistriggering of the IGBT at turn-off l Active Miller Clamp: the feature is implemented on the demoboard by connecting TD350 CLAMP pin to the IGBT gate with R9=0R resistor l 2-Step Turn-Off: at turn-off the gate-to-source voltage will be lowered to 10V during approximately 1.5µs to reduce over-voltage stress on the IGBT in case of over-current event l DESAT not used: to simplify the design DESAT pin is connected to GND to inhibit the function. To implement the desaturation protection, see Section 2.5. Figure 5: TD350 demoboard used in basic application 7 2 4 5 1 3 6 8 In1 Lvoff VL Gnd Fault Gnd VH In2 2 4 1 3 Desat Out Gnd Clamp TD350 demoboard 16V 47pF* (*): optional parts |
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