VID1

VID0

LPM

EN

SS

VOS

FBS

SW

SW

PGND

PGND

AGND

PVIN

PVIN

PG

AVIN

Gate drive

Power control

PG Control

UVLO

Thermal

shutdown

Soft

start

Reference voltage

control logic

Control logic

FBS

High-side

limit

Low-side

limit

Comparator

Comparator

Comparator

Direct control

and

compensation

DCS-ControlŒ

+

Ramp

Error

amplifier

Output

discharge

EN

TPS62134A, TPS62134B, TPS62134C, TPS62134D

www.ti.com

SLVSC20D – JANUARY 2015 – REVISED MAY 2015

9 Detailed Description

9.1 Overview

The TPS62134x synchronous switched-mode power converters are based on DCS-Control™ (direct control with

seamless transition into power-save mode), an advanced regulation topology that combines the advantages of

hysteretic, voltage-mode, and current-mode control including an AC loop that is directly associated to the output

voltage. This control loop uses information about output voltage changes and feeds the information directly to a

fast comparator stage. The control loop provides immediate response to dynamic load changes. For 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 PWM (pulse width modulation) mode for medium and heavy load

conditions and a power-save mode (PSM) at light loads. During PWM mode, the devices operate at the nominal

switching frequency in continuous conduction mode (CCM). This frequency is approximately 1 MHz (typical) with

a controlled frequency variation depending on the input voltage. If the load current decreases, the converter

enters PSM to sustain high efficiency down to very light loads. In PSM, the switching frequency decreases

linearly with the load current. Because DCS-Control™ supports both operation modes within one single building

block, the transition from PWM to PSM is seamless without effects on the output voltage.

9.2 Functional Block Diagram

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Product Folder Links: TPS62134A TPS62134B TPS62134C TPS62134D