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TPS51513RHBT Datasheet(PDF) 16 Page - Texas Instruments

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Part No. TPS51513RHBT
Description  SINGLE PHASE, D-CAP SYNCHRONOUS BUCK CONTROLLER
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS51513RHBT Datasheet(HTML) 16 Page - Texas Instruments

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ISLEW
29
R
SLEW1
VREF
32
GND
1
R
SLEW2
OPEN
UDG-09080a
UDG-09080b
ISLEW
29
R
SLEW1
OPEN
VREF
32
GND
1
R
SLEW2
TPS51513
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
www.ti.com
PG is negative active; PGOOD is positive active.
Both signals go inactive as soon as the EN pin is pulled low or an undervoltage condition on V5IN is detected.
Both signals are masked during DAC transitions to prevent false triggering during voltage slewing.
Output Overvoltage Protection (OVP):
An OVP condition is detected when VCORE reaches the high PG threshold. When this threshold is reached, the
converter sets PGOOD and PG signals inactive, performs the soft-stop sequence, and latches OFF. The
converter remains in this state until the device is reset by cycling either V5IN or EN.
However, because of the dynamic nature of actively power managed systems, the +200 mV OVP threshold is
blanked during voltage transitions. In order to protect the processor 100% of the time, there is a second OVP
level fixed at 1.55-V nominal which is always active. When a fixed OVP condition is detected, PGOOD and PG
are set inactive and DRVL is driven HI. The converter remains in this state until either V5IN or EN are cycled.
Output Undervoltage Protection (UVP)
Output undervoltage protection works in conjunction with the current protection described below. If VCORE drops
below the low PGOOD threshold for 80ms, then the converter enters soft-stop mode and latches OFF at the
completion of soft stop.
Current Protection
Two types of current protection are provided in the TPS51513:
Overcurrent Protection (OCP)
Negative OCP
Overcurrent Protection
The TPS51513 uses a “valley” current limiting circuit. As a result, the OCP set point is the OCP DC limit minus
half of the ripple current. Current limiting occurs on a pulse-by-pulse basis. If the sensed current value is above
the OCP setting, the converter holds off the next ON pulse until the current ramp drops below the OCP limit.
Eight OCP settings are provided in two ranges. The ranges are selected by the termination of the RSLEW resistor
as in Figure 8.
The OCP range is selected by the connection of the RSLEW resistor. Connect RSLEW to VREF to select the high
OCP range as shown in Figure 8. Connect RSLEW to GND to select the low OCP range as shown in Figure 9
Figure 8. Connection to Select High Range
Figure 9. Connection to Select Low Range
Overcurrent Protection
Overcurrent Protection
16
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Product Folder Link(s) :TPS51513


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