Taggsladder 2 Posted September 30, 2015 Share Posted September 30, 2015 Hello I am working on a curcuit that need to switch two loads max 200mA. One load gets feed ground and the other load gets feed positive. VCC will be in a span of 6-30VDC. The curciut works as intended when VCC is 6VDC, but at the max span VCC 30VDC all (Q1, Q2, Q4) transistors and the FET breaks when the pin from the MCU goes HIGH. This will happen even if the connector is unconnected. Q1, Q2 http://www.farnell.com/datasheets/699988.pdf Q4 http://www.farnell.com/datasheets/1885683.pdf From what stupid me can read from the datasheet Q1 and Q2 should be able to handle 45V between collector-emitter. But I think that I can understand why Q4 fails becouse it can handle 20V max between gate-source. Am I right? Thanks Best regards, Andreas Quote Link to post Share on other sites
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