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TPS40057PWP Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS40057PWP
Description  WIDE INPUT SYNCHRONOUS BUCK CONTROLLER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS40057PWP Datasheet(HTML) 11 Page - Texas Instruments

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TPS40054
TPS40055
TPS40057
SLUS593B − DECEMBER 2003 − REVISED APRIL 2004
11
www.ti.com
APPLICATION INFORMATION
Once the soft-start is initiated, the UVLO cicruit must see a total count of seven cycles in which the ramp duration
is longer than the clock cycle before an undervoltage condition is declared. (See Figure 4).
UDG−02132
Clock
PWM RAMP
PowerGood
VIN
UVLO Threshold
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2
Figure 4. Undervoltage Lockout Operation
The tolerance on the UVLO set point also affects the maximum duty cycle achievable. If the UVLO starts the
device at 10% below the nominal start up voltage, the maximum duty cycle is reduced approximately 10% at
the nominal start up voltage.
The impedance of the input voltage can cause the input voltage, at the controller, to sag when the converter
starts to operate and draw current from the input source. Therefore, there is voltage hysteresis that prevents
nuisance shutdowns at the UVLO point. With RT chosen to select the operating frequency and RKFF chosen
to select the start−up voltage, the approximate amount of hysteresis voltage is shown in Figure 5.
10
0.2
0
15
20
25
30
35
40
0.6
0.4
0.8
1.2
1.0
VUVLO − Undevoltage Lockout Threshold − V
UNDERVOLTAGE LOCKOUT THRESHOLD
vs
HYSTERESIS
Figure 5.


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