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TPS61045DRBR Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TPS61045DRBR
Description  DIGITALLY ADJUSTABLE LCD BOOST CONVERTER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS61045DRBR Fiches technique(HTML) 10 Page - Texas Instruments

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td1
t(DWN)
td1
t(OFF)
Device Enabled
Device Disabled
High
Low
EN
td1
t(UP)
TPS61045
SLVS440A – JANUARY 2003 – REVISED SEPTEMBER 2003
DETAILED DESCRIPTION (continued)
Table 1. Timing Table
DAC OUTPUT DO
TIME
LOGIC LEVEL
Increase one step
t(UP) = 1 µs to 60 µs
Low
Decrease one step
t(DWN) = 140 µs to 240 µs
Low
Shutdown
t(OFF) ≥ 560 µs
Low
Delay between steps
td1 = 1 µs
High
Figure 16. CTRL Timing Diagram
UNDERVOLTAGE LOCKOUT
An undervoltage lockout feature prevents misoperation of the device at input voltages below 1.5 V (typ). As long
as the input voltage is below the undervoltage threshold the device remains off, with the input switch (Q1) and
the main switch (Q2) open.
THERMAL SHUTDOWN
An internal thermal shutdown is implemented in the TPS61045 that shuts down the device if the typical junction
temperature of 160
°C is exceeded. If the device is in thermal shutdown mode, the input switch (Q1) and the main
switch (Q2) are open.
10


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