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Std Datasheet(Fiches technique) 2 Page - Texas Instruments

Numéro de pièce Std
Description  TPS62125EVM-044 Evaluation Module
Télécharger  17 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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Std Datasheet(HTML) 2 Page - Texas Instruments

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Introduction
www.ti.com
1
Introduction
The TPS62125 is a 300-mA, synchronous, step-down converter in a 2x2-mm, 8-pin WSON package.
1.1
Background
The TPS62125EVM-044 (PWR044) uses the TPS62125 device and is set to a 3.3-V output. The EVM
operates with full-rated performance with an input voltage between 4 V and 17 V, assuming JP1 is
connected between ON and EN.
The TPS62125 device contains an adjustable enable threshold and adjustable hysteresis feature. Thus,
the input voltage at which the device enables and disables is fully programmable by the user. In the
TPS62125EVM-044, the device is set to turn on at 6 V and turn off at 4 V. This feature can be bypassed
by using jumper JP1, which overrides the programmed threshold voltages.
1.2
Performance Specification
Table 1 provides a summary of the TPS62125EVM-044 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
JP1 connected between EN and ON
4
17
V
Output voltage
PWM Mode of Operation
3.3
V
Output current
0
300
mA
Peak efficiency
93.3%
Soft-start time
Ramp time of the output voltage
330
µs
1.3
Modifications
The printed-circuit board (PCB) for this EVM accommodates additional input and output capacitors, as well
as a feedforward capacitor.
1.3.1
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 is provided for an additional output capacitor. This capacitor is 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.
1.3.2
Feedforward Capacitor
C6 is provided for a feedforward capacitor. This capacitor is not required for proper operation but can be
used to improve the transient response. Typically, using a 22-pF feedforward capacitor reduces or
eliminates any output voltage overshoot that may occur at start-up. C6 is located on the back side of the
PCB.
2
Setup
This section describes how to properly use the TPS62125EVM-044.
2.1
Input/Output Connector Descriptions
2
TPS62125EVM-044 Evaluation Module
SLVU659A – March 2012 – Revised March 2012
Submit Documentation Feedback
Copyright © 2012, Texas Instruments Incorporated


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