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NCD5703ADR2G Datasheet(PDF) 6 Page - ON Semiconductor |
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NCD5703ADR2G Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 20 page NCD5703A, NCD5703B, NCD5703C www.onsemi.com 6 Table 1. PIN FUNCTION DESCRIPTION Pin Name No. I/O/x Description VIN 1 I Input signal to control the output. In applications which require galvanic isolation, VIN is generat- ed at the opto output, the pulse transformer secondary or the digital isolator output. VO (VOH/ VOL) signal is in phase with VIN. VIN is internally clamped to GND and has a pull−down resistor of 1 M W to ensure that an output is low in the absence of an input signal. A minimum pulse− width is required at VIN before VO (VOH/VOL) is activated. VREF 2 O 5 V Reference generated within the driver is brought out to this pin for external bypassing and for powering low bias circuits (such as digital isolators). FLT 3 O Fault open drain output (active low) that allows communication to the main controller that the driver has encountered a fault condition and has deactivated the output. Open drain allows easy setting of (inactive) high level and parallel connection of multiple fault signals. Connect to 10k pull−up resistor recommended. Truth Table is provided in the datasheet to indi- cate conditions under which this signal is asserted. Capable of driving optos or digital isolators when isolation is required. DESAT 4 I Input for detecting the desaturation of IGBT due to a fault condition. A capacitor connected to this pin allows a programmable blanking delay every ON cycle before DESAT fault is processed, thus preventing false triggering. VCC 5 x Positive bias supply for the driver. The operating range for this pin is from UVLO to the maxi- mum. A good quality bypassing capacitor is required from this pin to GND and should be placed close to the pins for best results. VO (NCD5703A, NCD5703B) 6 O Driver output that provides the appropriate drive voltage, source and sink current to the IGBT gate. VO is actively pulled low during start−up and under Fault conditions. VOH (NCD5703C) 6 O Driver high output that provides the appropriate drive voltage and source current to the IGBT gate. VOL (NCD5703C) 7 O Driver low output that provides the appropriate drive voltage and sink current to the IGBT gate. VOL is actively pulled low during start−up and under Fault conditions. GND (NCD5703A, NCD5703B) 7 x This pin should connect to the IGBT Emitter with a short trace. All power pin bypass capacitors should be referenced to this pin and kept at a short distance from the pin. GND (NCD5703C) 8 x This pin should connect to the IGBT Emitter with a short trace. All power pin bypass capacitors should be referenced to this pin and kept at a short distance from the pin. VEE (NCD5703B) 8 x A negative voltage with respect to GND can be applied to this pin and that will allow VO to go to a negative voltage during OFF state. A good quality bypassing capacitor is needed from VEE to GND. If a negative voltage is not applied or available, this pin must be connected to GND. CLAMP (NCD5703A) 8 I/O Provides clamping for the IGBT gate during the off period to protect it from parasitic turn−on. To be tied directly to IGBT gate with minimum trace length for best results. |
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