TOTEM－POLE_DRIVER_WITH_BOOTSTRAPPING

Published:2009/7/6 4:23:00 Author:May | From:SeekIC

When driving MOSPOWER in a totem-pole output conftguration, it is necessary to have the gate voltage 10 to 15 V positive with respect to the source in order to handle load currents near the MOSPOWER maximum ratings. The D169 lends itself to bootstrapping because of its high-voltage ratings. In the circuit shown, the voltage on the 2000-pF bootstrap capacitors is applied via diode OR gates to the V+ terminal. Therefore, regardless of which output is high, 30 V is present at V +.Maximum switching frequency is determined by the input capacitance of the MOSPOWER transistors used.



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