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TD350 Datasheet(PDF) 8 Page - STMicroelectronics |
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TD350 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 17 page Functional description TD350 8/17 Doc ID 9525 Rev 6 5 Functional description 5.1 Input The input is compatible with optocouplers or pulse transformers. The input is triggered by the signal edge and allows the use of low-sized, low-cost pulse transformer. Input is active low (output is high when input is low) to ease the use of optocoupler. When driven by a pulse transformer, the input pulse (positive and negative) width must be larger than the minimum pulse width tonmin. 5.2 Voltage reference A voltage reference is used to create accurate timing for the two-level turn-off with external resistor and capacitor. 5.3 Desaturation protection Desaturation protection ensures the protection of the IGBT in the event of overcurrent. When the DESAT voltage goes higher that 7 V, the output is driven low (with 2-level turn-off if applicable). The FAULT output is activated. The FAULT state is exited at the next falling edge of IN input. A programmable blanking time is used to allow enough time for IGBT saturation. Blanking time is provided by an internal current source and external capacitor. DESAT input can also be used with an external comparator for overcurrent or over temperature detection. 5.4 Active Miller clamp A Miller clamp allows the control of the Miller current during a high dV/dt situation and can avoid the use of a negative supply voltage. During turn-off, the gate voltage is monitored and the clamp output is activated when gate voltage goes below 2 V (relative to GND). The clamp voltage is VL+3 V max for a Miller current up to 500 mA. The clamp is disabled when the IN input is triggered again. 5.5 Two level turn-off The two-level turn-off is used to increase the reliability of the application. During turn-off, gate voltage can be reduced to a programmable level in order to reduce the IGBT current (in the event of over-current). This action avoids both dangerous overvoltage across the IGBT, and RBSOA problems, especially at short circuit turn-off. Turn-off (Ta) delay is programmable through an external resistor and capacitor for accurate timing. Turn-off delay (Ta) is also used to delay the input signal to prevent distortion of input pulse width. |
Número de pieza similar - TD350_10 |
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Descripción similar - TD350_10 |
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