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AN-6073 Datasheet(PDF) 10 Page - Fairchild Semiconductor |
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AN-6073 Datasheet(HTML) 10 Page - Fairchild Semiconductor |
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10 / 13 page  AN-6073 APPLICATION NOTE © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.0 • 9/26/08 10 Typical Application Circuit Application Output Power Input Voltage Range Output Voltage/Maximum Current LCD Monitor Power Supply 44W Universal Input (90-264VAC) 12V/2A 5V/4A Features High-Voltage Startup Built-in 5ms Soft-Start Function Built-in VIN Pin Pull-High (> 4.7V) Recovery Function for Second-Side Output OVP Brownout Protection with Hysteresis Low Standby Mode Power Consumption (Input Wattage <0.3W at No-Load Condition) Key Design Notes Resistors R12 and R13 work as a startup resistor to provide necessary current for IC startup. After startup, there is no power loss on these resistors. The recommended values for R12 and R13 are 130KΩ(1/4W) and 51KΩ(1/4W). Because the VIN pin is connected through a resistive divider R3 and R16 to the rectified AC input line voltage, it can also be used for brownout protection. If the VIN voltage is less than 0.7V, the PWM output is shut off. As the VIN voltage reaches 0.92V, the PWM output is turned on again. The hysteresis window for ON/OFF is 0.22V. The recommended values for R3+R15, R16, and C16 are 10MΩ (5MΩ+5MΩ), 100KΩ, and 2.2µF. Using these values in the test board, the power supply is turned off at 66V (maximum load) and recovered at 70V. The secondary-side over-voltage protection (OVP) is achieved by pulling the VIN pin high. ZD1, ZD2, R29, R30, R31, R32, C15, and U3 form a secondary-side over-voltage protection (OVP) circuit. When each output reaches OVP, photocoupler U3 pulls the VIN pin high. The OVP voltages of the 12V-output and 5V-output are 15V and 6.8V, respectively. Figure 23. Schematic |
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