Background

www.ti.com

1

Background

The TPS55340 DC/DC converter is in typical applications a step-up boost converter, however this EVM

uses it in a SEPIC topology. Rated input voltage and output current range for the evaluation module are

given in Table 1. This evaluation module demonstrates the performance of the TPS55340 in an example

application and can accommodate evaluation of other SEPIC applications supported by the TPS55340.

This design shows a small printed-circuit-board area that can be achieved when designing with the

TPS55340 regulator. However, appropriate sizing of the inductor and diode for the desired application can

further reduce the board area. The switching frequency is externally set at a nominal 500kHz. The 40V,

5A, low-side MOSFET is incorporated inside the TPS55340 package along with the gate drive circuitry.

The low drain-to-source on-resistance of the MOSFET allows the TPS55340 to achieve high efficiencies.

The compensation components are external to the integrated circuit (IC). In this example application the

absolute maximum input voltage for the TPS55340EVM-147 is 26V.

Table 1. Input Voltage and Output Current Summary

EVM

Input Voltage Range

Maximum Output Current

TPS55340EVM-147

V

I

2

Performance Specification Summary

Table 2 provides a summary of the TPS55340EVM-147 performance specifications. Specifications are

given for an input voltage of V

specified. The ambient temperature is 25°C for all measurements, unless otherwise noted.

Table 2. Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

6

12

18

V

Output voltage set point

12

V

Line regulation

±0.1%

Operating frequency

500

kHz

Output current range

.001

1

A

1.5

2.6

A

1.9

3.4

A

Load regulation

±0.1%

Voltage change

–480

mV

Recovery time

1

ms

Load transient response

Voltage change

480

mV

Recovery time

1

ms

Loop bandwidth

6.3

kHz

Phase margin

59.3

°

Loop bandwidth

13.2

kHz

Phase margin

66.5

°

Output ripple voltage

60

mVpp

Output ripple voltage

40

mVpp

Maximum efficiency

92.1%

Maximum efficiency

92.1%

(1)

The over current limit is dependent on the input voltage and based on peak current limit of the TPS55340.

2

TPS55340EVM-147, 6V to 18V Input, 12V Output SEPIC Evaluation Module

SLVU742 – June 2012

Submit Documentation Feedback

Copyright © 2012, Texas Instruments Incorporated