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TPS40322RHBT Datasheet(PDF) 21 Page - Texas Instruments |
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TPS40322RHBT Datasheet(HTML) 21 Page - Texas Instruments |
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21 / 47 page  PWM1 0° PWM2 180° SYNC SYNC PWM1 90° PWM2 270° PWM1 PWM2 TPS40322 Master TPS40322 Slave PWM1 PWM2 PHSET PHSET BP6 UDG-11117 TPS40322 www.ti.com SLUSAF8E – JULY 2011 – REVISED JANUARY 2016 Figure 21. Synchronizing Two TPS40322 Devices 7.3.9 Overvoltage and Undervoltage Fault Protection The TPS40322 has output overvoltage protection and undervoltage protection capability. The comparators that regulate the overvoltage and undervoltage conditions use the FBx pin as the output sensing point so the filtering effect of the compensation network connected from COMPx to FBx has an effect on the speed of detection. As the output voltage rises or falls below the nominal value, the error amplifier attempts to force FBx to match its reference voltage. When the error amplifier is no longer able to do this, the FB pin begins to drift and trip the overvoltage threshold (VOVP) or the undervoltage threshold (VUVP) as described in the Electrical Characteristics table. When an undervoltage fault is detected, the TPS40322 enters hiccup mode and resumes normal operation when the fault is cleared. When an overvoltage fault is detected, the TPS40322 turns off the high-side MOSFET and latches on the low- side MOSFET to discharge the output current to the regulation level (within the Power Good window). When operating in dual-channel mode, both channels have identical yet independent protection schemes, which means one channel is not affected when the other channel is in fault mode. When operating in two-phase mode, only the FB1 pin is detected for overvoltage and undervoltage fault. Therefore both channels take action together during a fault. 7.3.10 Input Undervoltage Lockout (UVLO) A dedicated UVLO pin allows the user to program the desired input turn-on threshold voltage. The diagram is shown in Figure 22. The desired input turn-on threshold can be calculated using Equation 6. The input turn off hysteresis can be calculated using Equation 7. Copyright © 2011–2016, Texas Instruments Incorporated Submit Documentation Feedback 21 Product Folder Links: TPS40322 |
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