+

-

V

FB

GND

FB

VOUT

L

VIN

EN

Current

Sensor

Gate

Control

Modulator

Device

Control

VIN

VOUT

RI

VOUT

TPS61260, TPS61261

www.ti.com

SLVSA99B – MAY 2011 – REVISED NOVEMBER 2014

8 Detailed Description

8.1 Overview

The TPS6126x is based on a quasi-fixed frequency, pulse-width-modulation (PWM) controller using synchronous

rectification to obtain maximum efficiency. At low load currents, the converter enters Power Save Mode to ensure

high efficiency over a wide load current range. The TPS6126x is based on a current mode topology. The inductor

current is regulated by a fast current regulator loop which is controlled by either a voltage control loop or a

reference current. The controller also uses input and output voltage feedforward. Changes of the input and

output voltages are monitored and immediately change the duty cycle in the modulator to achieve a fast

response to those errors. In addition, the average output current can be programmed as well. An external resistor

is used to program the average output current.

8.2 Functional Block Diagrams

Figure 15. TPS61260

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Product Folder Links: TPS61260 TPS61261