O

S(PSM)

2

I

O

I

on

O

2

I

ƒ

V

V

V

t

V

L

´

=

-

´

´

O

on

I

V

t

1 s

V

=

m ´

TPS62134x

C2

47 µF

L1

1 µH

SW

VOS

AGND

PGND

FBS

C

(LOAD)

Load

Ground Plane Connection

TPS62134A, TPS62134B, TPS62134C, TPS62134D

SLVSC20D – JANUARY 2015 – REVISED MAY 2015

www.ti.com

9.3.7 Single-Ended Remote Sense (FBS)

The devices allow a single-ended remote sense by connecting the FBS pin at the load. This function overcomes

the parasitic resistance of the PCB traces and achieves an improved output-voltage regulation at the load. Avoid

any noise coupled into the FBS trace. Use a solid ground plane to connect the ground return of the load with the

AGND and PGND pins of the device. Connect the AGND and PGND pins directly to exposed thermal pad of the

device. Figure 3 shows an example.

Figure 3. Remote Sense Connection

9.3.8 Thermal Shutdown

(typical), the device goes into thermal shutdown. Both the high-side and low-side power MOSFETs are turned

soft start.

9.4 Device Functional Modes

9.4.1 PWM Operation and Power Save Mode

The device operates with pulse width modulation (PWM) in medium and heavy load with a fixed on-time circuitry

(2)

The typical PWM switching frequency is 1 MHz. The frequency variation in PWM is controlled and depends on

small duty-cycle applications.

To maintain high efficiency at light loads, the device enters PSM at the boundary to discontinuous conduction

mode (DCM). In PSM, the switching frequency decreases linearly with the load current maintaining high

efficiency. Use Equation 3 to calculate the switching frequency in PSM mode.

(3)

See Figure 12 for the switching frequency variation over load and input voltage.

10

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Product Folder Links: TPS62134A TPS62134B TPS62134C TPS62134D