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TPS61045DRBRG4 Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TPS61045DRBRG4
Description  Digitally Adjustable Boost Converter
Download  26 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61045DRBRG4 Fiches technique(HTML) 10 Page - Texas Instruments

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background image
td1
t(DWN)
td1
t(OFF)
Device Enabled
Device Disabled
High
Low
EN
td1
t(UP)
TPS61045
SLVS440C – JANUARY 2003 – REVISED DECEMBER 2014
www.ti.com
Figure 11. CTRL Timing Diagram
7.3.6 UVLO
An UVLO feature prevents misoperation of the device at input voltages below 1.5 V (typical). 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.
7.3.7 Thermal Shutdown
An internal thermal shutdown is implemented in the TPS61045 device 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.
7.4 Device Functional Modes
The device operates in a pulse frequency modulation (PFM) scheme with constant peak current control. This
control scheme maintains high efficiency over the entire load current range, and with a switching frequency of up
to 1 MHz, the device enables the use of small external components. The converter monitors the output voltage.
When the feedback voltage falls below the reference voltage of 1.233 V (typical), the main switch turns on and
the current ramps up. The main switch turns off when the inductor current reaches the internally set peak current
of 375 mA (typical).
10
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