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TPS62150ARGTT Datasheet(PDF) 8 Page - Texas Instruments

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No. de pieza TPS62150ARGTT
Descripción Electrónicos  3-V to 17-V, 1-A Step-Down Converter in 3-mm3-mm QFN Package
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS62150ARGTT Datasheet(HTML) 8 Page - Texas Instruments

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background image
control logic
Soft
start
Thermal
Shtdwn
UVLO
PG control
power
control
error
amplifier
gate
drive
HS lim
LS lim
PVIN
PVIN
AVIN
PG
PGND
PGND
AGND
comp
comp
+
_
timer tON
DCS - Control
TM
direct control
&
compensation
comparator
ramp
SW
SW
SW
EN
*
SS/TR
DEF
*
FSW
*
VOS
FB
Copyright © 2016, Texas Instruments Incorporated
8
TPS62150, TPS62150A, TPS62151, TPS62152, TPS62153
SLVSAL5D – NOVEMBER 2011 – REVISED SEPTEMBER 2016
www.ti.com
Product Folder Links: TPS62150 TPS62150A TPS62151 TPS62152 TPS62153
Submit Documentation Feedback
Copyright © 2011–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The TPS6215x synchronous switched-mode power converter is based on DCS-Control topology, an advanced
regulation topology that combines the advantages of hysteretic, voltage-mode, and current-mode control,
including an ac loop directly associated with the output voltage. This control loop takes information about output
voltage changes and feeds that information directly to a fast comparator stage. It sets the switching frequency,
which is constant for steady-state operating conditions, and provides immediate response to dynamic load
changes. To get accurate dc load regulation, a voltage feedback loop is used. The internally compensated
regulation network achieves fast and stable operation with small external components and low-ESR capacitors.
The DCS-Control topology supports pulse-width modulation (PWM) mode for medium and heavy load conditions
and a power-save mode at light loads. During PWM, it operates at its nominal switching frequency in continuous-
conduction mode. This frequency is typically about 2.5 MHz or 1.25 MHz, with a controlled frequency variation
depending on the input voltage. If the load current decreases, the converter enters power-save mode to sustain
high efficiency down to very light loads. In power-save mode, the switching frequency decreases linearly with the
load current. Because DCS-Control topology supports both operation modes within a single building block, the
transition from PWM to power-save mode is seamless without effects on the output voltage.
Fixed-output voltage versions provide the smallest solution size and lowest current consumption, requiring only
three external components. An internal current limit supports nominal output currents of up to 1 A.
The TPS6215x offers both excellent dc voltage and superior load transient regulation, combined with very low
output voltage ripple, minimizing interference with RF circuits.
8.2 Functional Block Diagrams
* This pin is connected to a pull down resistor internally (see Feature Description section)
Figure 5. TPS62150 (Adjustable Output Voltage)


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