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TPS40322 Datasheet(PDF) 21 Page - Texas Instruments

Part No. TPS40322
Description  Dual Output or Two-Phase Synchronous Buck Controller
Download  47 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40322 Datasheet(HTML) 21 Page - Texas Instruments

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PWM1
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
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