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TPS54821 датащи(PDF) 13 Page - Texas Instruments

номер детали TPS54821
подробное описание детали  TPS54821 4.5 V to 17 V Input, 8 A Synchronous Step Down Converter With Hiccup
PDF  42 Pages
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производитель  TI2 [Texas Instruments]
домашняя страница  https://www.ti.com
Logo TI2 - Texas Instruments

TPS54821 датащи(HTML) 13 Page - Texas Instruments

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ENFALLING
STOP
ENFALLING
p
h
R1 V
R2 =
V
V
R1 I
I
1
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÷
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÷
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ENFALLING
START
STOP
ENRISING
ENFALLING
p
h
ENRISING
V
V
V
V
R1 =
V
I
I
V
EN
ip
ih
VIN
TPS54821
R 1
R 2
EN
ip
ih
PVIN
TPS54821
R 1
R 2
EN
ip
ih
VIN
TPS54821
R 1
R 2
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TPS54821
www.ti.com
SLVSB14B – OCTOBER 2011 – REVISED FEBRUARY 2016
Product Folder Links: TPS54821
Submit Documentation Feedback
Copyright © 2011–2016, Texas Instruments Incorporated
Device Functional Modes (continued)
The EN pin has a small pull-up current Ip which sets the default state of the pin to enable when no external
components are connected. The pull-up current is also used to control the voltage hysteresis for the UVLO
function since it increases by Ih once the EN pin crosses the enable threshold. The UVLO thresholds can be
calculated using Equation 2 and Equation 3.
Figure 17. Adjustable VIN Undervoltage Lock Out
Figure 18. Adjustable PVIN Undervoltage Lock Out, VIN
≥ 4.5V
Figure 19. Adjustable VIN and PVIN Undervoltage Lock Out
(2)
(3)
Where Ih = 3.3 μA, Ip = 1.15 μA, VENRISING = 1.21 V, VENFALLING = 1.17 V



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