Datasheet

Introduction

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1.2 Performance Specification

Table 1 provides a summary of the TPS62175EVM-098 performance specifications. All specifications are

given for an ambient temperature of 25°C.

Table 1. Performance Specification Summary

Specification Test Conditions Min Typ Max Unit

Input Voltage 4.75 28 V

Output Voltage DC setpoint; does not include voltage ripple 3.27 3.33 3.39 V

Output Current SLEEP = HIGH (OFF) 0 500 mA

Peak Efficiency VIN = 4.75 V 92.2%

Soft-Start Time Ramp Time of VOUT 330 µs

Soft-Start Delay Time Time from HIGH EN to Start of VOUT Ramp 1 ms

1.3 Modifications

The printed-circuit board (PCB) for this EVM is designed to accommodate both the fixed and adjustable

voltage versions of this integrated circuit (IC). Additional input and output capacitors can also be added.

Finally, the loop response of the IC can be measured.

1.3.1 Fixed Output Voltage Operation

U1 can be replaced with the fixed-voltage version of the IC for evaluation. For fixed-voltage version

operation, replace R2 with a 0-Ω resistor and remove R1.

1.3.2 Input and Output Capacitors

C3 is provided for an additional input capacitor. This capacitor is not required for proper operation but can

be used to reduce the input voltage ripple.

C4 and C6 are provided for additional output capacitors. These capacitors are not required for proper

operation but can be used to reduce the output voltage ripple and to improve the load transient response.

The total output capacitance must remain within the recommended range in the data sheet for proper

operation.

1.3.3 Loop Response Measurement

The loop response of the TPS62175EVM-098 can be measured with two simple changes to the circuitry.

First, install a 10-Ω resistor across the pads in the middle of the back of the PCB. The pads are spaced to

allow installation of 0805- or 0603-sized resistors. Second, cut the short section of trace between the via

on the VOS pin and the output capacitor C2. This change is shown in Figure 1. With these changes, an ac

signal (10-mV, peak-to-peak amplitude recommended) can be injected into the control loop across the

added resistor.

TPS62175EVM-098 Evaluation Module SLVU743–September 2012

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