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TPS40061PWPR Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TPS40061PWPR
Description  WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER
Download  37 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40061PWPR Fiches technique(HTML) 9 Page - Texas Instruments

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VUVLO - Undervoltage Lockout Threshold - V
UNDERVOLTAGE LOCKOUT
vs
HYSTERESIS
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
TPS40060
TPS40061
www.ti.com
SLUS543F – DECEMBER 2002 – REVISED JUNE 2013
where:
•
VIN is the desired start-up (UVLO) input voltage
•
RT is the timing resistor in kΩ
(3)
The variable UVLO function utilizes a 3-bit full adder to prevent spurious shut-downs or turn-ons due to spikes or
fast line transients. When the adder reaches a total of seven counts in which the ramp duration is shorter the
clock cycle a powergood signal is asserted, a soft-start initiated, and the upper and lower MOSFETs are turned
off.
Once the soft-start is initiated, the UVLO circuit 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).
Figure 4. Undervoltage Lockout Operation
Figure 5.
Copyright © 2002–2013, Texas Instruments Incorporated
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