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TPS62097RWKT Datasheet(PDF) 7 Page - Texas Instruments

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No. de pieza TPS62097RWKT
Descripción Electrónicos  TPS62097 2-A High Efficiency Step-Down Converter with iDCS-Control, Forced PWM Mode and Selective Switching Frequency
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS62097RWKT Datasheet(HTML) 7 Page - Texas Instruments

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background image
VOS
FB
PGND
Output Discharge
Logic
165Ω
R2
(1)
R1
(1)
Direct Control
and
Compensation
t
Timer
ON
Comparator
Ramp
Error Amplifier
iDCS - Control
MOSFET Driver
Control Logic
High-side
Current Sense
Hiccup
Counter
SW
PVIN
EN
Bandgap
Undervoltage Lockout
Thermal Shutdown
EN
PG
V
FB
V
REF
V
REF
375k
(2)
Note:
(1) R1, R2 are implemented in the fixed output voltage versions only.
(2) When the device is enabled, the 375 k
resistor is disconnected.
SS/TR
Voltage
Clamp
V
IN
V
REF
MODE
On time
Selection
V
IN
AVIN
AGND
Low-side
Current Sense
TPS62097
www.ti.com
SLVSCD6 – DECEMBER 2015
8 Detailed Description
8.1 Overview
The TPS62097 synchronous step-down converter is based on the iDCS-Control (Industrial Direct Control with
Seamless transition into Power Save Mode) topology. The control topology not only keeps the advantages of
DCS-Control, but also provides other features:
Forced PWM mode over the whole load range
Selectable PWM switching frequency
1% output voltage accuracy
Output voltage sequencing and tracking
The iDCS-Control topology operates in PWM (Pulse Width Modulation) mode for medium to heavy load
conditions and in Power Save Mode (PSM) at light load conditions. Or it forces the device in fixed frequency
PWM mode only operation for the whole load range.
In PWM mode, the device operates with a predictive On-time switching pulse. A quasi-fixed switching frequency
over the input and output voltage range is achieved by using an input and output voltage feed forward to set the
on-time, as shown in Table 1. The converter enters Power Save Mode, reducing the switching frequency and
minimizing current consumption, to achieve high efficiency over the entire load current range. Since iDCS-Control
supports both operation modes within a single building block, the transition from PWM mode to Power Save
Mode is seamless and without effects on the output voltage.
8.2 Functional Block Diagram
Copyright © 2015, Texas Instruments Incorporated
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