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MAX5014CSA Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX5014CSA Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 14 page To reduce power dissipation the high-voltage regulator is disabled when the VDD voltage reaches 12.7V. This greatly reduces power dissipation and improves effi- ciency. If VCC falls below the undervoltage lockout threshold (VCC = 6.6V), the low-voltage regulator is dis- abled, and soft-start is reinitiated. In undervoltage lock- out the MOSFET driver output (NDRV) is held low. If the input voltage range is between 13V and 36V, V+ and VDD may be connected to the line voltage provid- ed that the maximum power dissipation is not exceed- ed. This eliminates the need for a tertiary winding. Undervoltage Lockout (UVLO), Soft-Start, and Shutdown The soft-start feature of the MAX5014/MAX5015 allows the load voltage to ramp up in a controlled manner, thus eliminating output voltage overshoot. While the part is in UVLO, the capacitor connected to the SS_SHDN pin is discharged. Upon coming out of UVLO an internal current source starts charging the capacitor to initiate the soft-start cycle. Use the follow- ing equation to calculate total soft-start time: _______________________________________________________________________________________ 9 Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies MAX5014 VDD V+ SS_SHDN NDRV CS GND VCC OPTO VIN VOUT OPTOCOUPLER CDD CSS CCC 100 Ω RSENSE R1 R2 COUT CIN NT NP NS M1 4.7nF 250VAC TLV431 220 Ω Figure 3. Flyback Converter |
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