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User's Guide

SLVU484– June 2011

TPS4335xEVM Evaluation Module

1 Introduction

The Texas Instruments TPS4335xEVM evaluation module (EVM) helps designers evaluate the operation

and performance of the TPS4335x family of Switch Mode Power Supplies – Multiple-output voltage

regulator.

The EVM contains one DC / DC converter / controller (see Table 1).

Table 1. Device and Package Configurations

CONVERTER IC PACKAGE

TPS43350QDAPQ1

U1 DAP-38

TPS43351QDAPQ1

2 Setup

This section describes the jumpers and connectors on the EVM as well and how to properly connect, set

up and use the TPS4335xEVM.

2.1 Input/Output Connector Description

J1 – Input is the protected power input terminal for the converter with a voltage range from 4V-40V. The

terminal block provides a power (Vbat) and ground (GND) connection to allow the user to attach the EVM

to a cable harness. The power path provides a series Schottky diode for reverse battery protection.

J2 – VOUTA is the output terminal for the TPS4335x buck controller A. The terminal block provides a

power (VOUTA) and ground (GND) connection.

J3 – VOUTB is the output terminal for the TPS4335x buck controller B. The terminal block provides a

power (VOUTB) and ground (GND) connection.

JP5 – ENA is the jumper used to enable buck controller A. The controller will be enabled when the ENA is

high and disabled when low.

Figure 1. ENA Jumper Settings

JP6 – ENB is the jumper used to enable buck controller B. The controller will be enabled when the ENB is

high and disabled when low.

SLVU484–June 2011 TPS4335xEVM Evaluation Module

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Summary of content (11 pages)

PAGE 1
User's Guide SLVU484 – June 2011 TPS4335xEVM Evaluation Module 1 Introduction The Texas Instruments TPS4335xEVM evaluation module (EVM) helps designers evaluate the operation and performance of the TPS4335x family of Switch Mode Power Supplies – Multiple-output voltage regulator. The EVM contains one DC / DC converter / controller (see Table 1). Table 1.
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Setup www.ti.com 0 ENB 1 ENB 1 0 enabled disabled Figure 2. ENB Jumper Settings JP2 – SYNC is the external clock input for switching frequency synchronization of the buck converters and to enable Low Power Mode (LPM). The external clock source can be attached to the center pin of JP4. A high logic level on this pin ensures forced continuous mode operation of the buck controllers and inhibits transition to low power mode.
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Setup www.ti.com Test Points DLYAB GND (x4) PGA PGB PHA PHB SSA SSB VBAT VIN VOUTA VOUTB 2.
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Board Layout www.ti.com If jitter is observed on the phase signal of the regulator, then noise may be entering the feedback interface and a capacitive filter may be required. The EVM provides a 47pF-capacitor across the low-side feedback resistors. Typically 47pF to 100pF is sufficient to filter any noise issues. 3 Board Layout Figure 6, Figure 7, Figure 8, and Figure 9 show the board layout for the TPS4335xEVM PWB. Figure 10 displays the schematic.
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Board Layout www.ti.com Figure 6. Top Assembly Layer Figure 7.
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Board Layout www.ti.com Figure 8. Bottom Assembly Layer Figure 9.
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Schematic and Bill of Materials www.ti.com Table 3. Bill of Materials COMMENT DESCRIPTION TI Bug DESIGNATOR FOOTPRINT QTY *1 TI Bug New 1 G,100uF,63V,Al-El,EEE-FK1J101P Capacitor, Aluminum, SM, ±20%, vvV, C1, C7 ELKO-AL-G 2 2220,10uF,100V,ceramic Capacitor, Ceramic, vvV, [temp], [tol] C2, C19 CAP_2220 2 0603,0.
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Schematic and Bill of Materials www.ti.com Table 3. Bill of Materials (continued) COMMENT DESCRIPTION DESIGNATOR FOOTPRINT QTY PHB Glass Beaded Test Point TP11 TEST POINT 0.052 1 SSB Glass Beaded Test Point TP12 TEST POINT 0.052 1 DLYAB Glass Beaded Test Point TP13 TEST POINT 0.
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Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.