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MB39C602 Datasheet(PDF) 12 Page - Cypress Semiconductor |
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MB39C602 Datasheet(HTML) 12 Page - Cypress Semiconductor |
12 / 40 page Document Number: 002-08397 Rev. *A Page 12 of 40 MB39C602 4. Power-Up Sequencing When the voltage is input to VBULK, the electric charge is charged to capacitance of the VCG pin (CVCG) through starting resistor (Rst). So, the voltage of the VCG pin rises. The voltage of the DRN pin rises by source follower when the voltage of the VCG pin reaches the threshold voltage of the external HVMOSFET. The DRN pin is connected with the VDD pin through the internal VDD Switch, and VDD capacitor (CVDD) is charged from the DRN pin. When the voltage at the VDD pin reaches the threshold voltage of UVLO, the VDD Switch is turned off, and the internal Bias circuit operates, and the switching is started. After the switching begins, the voltage at the VDD pin is supplied from Auxiliary Winding through the external diode (DBIAS). The voltage of an Auxiliary Winding is decided by rolling number ratio of Auxiliary Winding and Secondary Winding, and the voltage of Secondary Winding. Therefore, the voltage at the VDD pin is not supplied, until the voltage of Auxiliary Winding rises more than the voltage at the VDD pin. In this period, it is necessary to set the capacitor of the VDD pin to prevent the voltage of the VDD pin from falling below the threshold voltage of UVLO. The external Schottky diode (D1) is required between the DRN pin and VDD pin. This diode is used to prevent the current that flows through the body diode of the VDD Switch. Current Passing When Starting 10V/8V VCG Shunt Enable PWM 14V 2V UVLO DRN 6 VCG 5 Fault 8 VDD VDD Switch HS Drive Driver GND 7 PWM Control D1 DBIAS CVDD Rst CVCG VBULK VDD Start-up Current VDD Operating and LPM Current HV-MOSFET Primary Winding Auxiliary Winding Ist |
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