control logic

Soft

start

Thermal

Shtdwn

UVLO

PG control

power

control

error

amplifier

gate

drive

HS lim

LS lim

VIN

PG

PGND

AGND

comp

comp

+

_

DCS - Control

TM

direct control

&

compensation

comparator

ramp

SW

EN

*

VOS

FB

(see Detailed Description section).

TPS62160-Q1

www.ti.com

SLVSCK6 – DECEMBER 2014

8 Detailed Description

8.1 Overview

The TPS62160-Q1 synchronous switched mode power converter is 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 directly associated to the output voltage. This control loop takes

information about output voltage changes and feeds it 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 PWM (Pulse Width Modulation) 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 2.25 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. Since DCS-Control™ supports both operation modes within one single building block, the transition

from PWM to Power Save Mode is seamless without effects on the output voltage.

8.2 Functional Block Diagram

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