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TPS63027YFFR Fiches technique(PDF) 7 Page - Texas Instruments

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No de pièce TPS63027YFFR
Description  High Current, High Efficiency Single Inductor Buck-Boost Converter
Download  23 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS63027YFFR Fiches technique(HTML) 7 Page - Texas Instruments

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PGND
PGND
VIN
VOUT
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-
VREF
PGND
PGND
FB
VOUT
L2
L1
VIN
VINA
PFM/PWM
EN
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Current
Sensor
Gate
Control
Modulator
Oscillator
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Temperature
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EN
Copyright
2016, Texas Instruments Incorporated
©
7
TPS63027
www.ti.com
SLVSDK8 – DECEMBER 2016
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Copyright © 2016, Texas Instruments Incorporated
9 Detailed Description
9.1 Overview
The TPS63027 use 4 internal N-channel MOSFETs to maintain synchronous power conversion at all possible
operating conditions. This enables the device to keep high efficiency over the complete input voltage and output
power range. To regulate the output voltage at all possible input voltage conditions, the device automatically
switches from buck operation to boost operation and back as required by the configuration. It always uses one
active switch, one rectifying switch, one switch is held on, and one switch held off. Therefore, it operates as a
buck converter when the input voltage is higher than the output voltage, and as a boost converter when the input
voltage is lower than the output voltage. There is no mode of operation in which all 4 switches are switching at
the same time. Keeping one switch on and one switch off eliminates their switching losses. The RMS current
through the switches and the inductor is kept at a minimum, to minimize switching and conduction losses.
Controlling the switches this way allows the converter to always keep higher efficiency.
The device provides a seamless transition from buck to boost or from boost to buck operation.
9.2 Functional Block Diagram
9.3 Feature Description
9.3.1 Undervoltage Lockout (UVLO)
To avoid mis-operation of the device at low input voltages, an undervoltage lockout is included. UVLO shuts
down the device at low input voltages to ensure proper operation. See eletrical characteristics table for the
dedicated values.


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