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ZXGD3101T8TA Datasheet(PDF) 5 Page - Diodes Incorporated |
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ZXGD3101T8TA Datasheet(HTML) 5 Page - Diodes Incorporated |
5 / 14 page ZXGD3101T8 Issue 4 - January 2009 5 www.zetex.com © Diodes Incorporated 2009 www.diodes.com Operation Normal Operation The operation of the device is described step-by-step with reference to the timing diagram below. 1. The detector monitors the MOSFET Drain-Source voltage. 2. When, due to transformer action, the MOSFET body diode is forced to conduct there is approximately -0.6V on the Drain pin. 3. The detector outputs a positive voltage with respect to ground, this voltage is then fed to the MOSFET driver stage and current is sourced out of the GATEH pin. 4. The current out of the GATEH pin is sourced into the synchronous MOSFET Gate to turn the device on. 5. The GATEH output voltage is now proportional to the Drain-Source voltage drop across the MOSFET due to the current flowing through the MOSFET. 6. MOSFET conduction continues until the drain current reaches zero. 7. At zero current the detector output voltage is zero and the synchronous MOSFET Gate voltage is pulled low by the GATEL, turning the device off. D r ain cu r r e n t ze r o Body D iode C onduction 1 2 3 4 5 6 7 M OSF ET D r ain Voltage M OSF ET Gate Voltage M OSF ET Gate C urrent |
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