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TPS62065QDSGRQ1 Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce TPS62065QDSGRQ1
Description  TPS6206x-Q1 3-MHz 2-A Step-Down Converter in 2 SON Package
Download  29 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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Zero-Pole
Amp.
Integrator
Error Amp.
PFM Comparator
PWM
Comp.
VREF
Control
Stage
Gate Driver
Anti
Shoot-Through
Current
Limit Comparator
Current
Limit Comparator
VREF
FB
SW
EN
AVIN
Softstart
VOUT RAMP
CONTROL
Thermal
Shutdown
Reference
0.6V VREF
Undervoltage
Lockout 1.8V
Limit
High Side
Limit
Low Side
Sawtooth
Generator
FB
AGND
Internal
FB
Network
(1)
PVIN
PGND
3MHz
Clock
R
Discharge
VREF
FB
PG
MODE/
PG Comparator
(1)
MODE
(1)
PG
TPS62065-Q1, TPS62067-Q1
SLVSCM3 – JANUARY 2015
www.ti.com
10 Detailed Description
10.1 Overview
The TPS62065-Q1 and TPS62067-Q1 step-down converter operates with 3-MHz (typical) fixed-frequency pulse-
width modulation (PWM) at moderate to heavy load currents. At light load currents the converter can
automatically enter power save mode and then operate in pulse-frequency mode (PFM).
During PWM operation the converter uses an unique fast-response voltage-mode controller scheme with input-
voltage feed-forward to achieve good line and load regulation which allows the use of small ceramic input and
output capacitors. At the beginning of each clock cycle initiated by the clock signal, the high-side MOSFET switch
is turned on. The current flows from the input capacitor through the high-side MOSFET switch through the
inductor to the output capacitor and load. During this phase, the current ramps up until the PWM comparator trips
and the control logic turns off the switch. The current-limit comparator also turns off the switch in case the
current-limit of the high-side MOSFET switch is exceeded. After a dead time preventing shoot-through current,
the low-side MOSFET rectifier is turned on and the inductor current ramps down. The current flows now from the
inductor to the output capacitor and to the load. The current returns back to the inductor through the low-side
MOSFET rectifier.
The next cycle is initiated by the clock signal again turning off the low-side MOSFET rectifier and turning on the
high-side MOSFET switch.
10.2 Functional Block Diagram
(1)
Function depends on device option.
8
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Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: TPS62065-Q1 TPS62067-Q1


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