Texas Instruments TPS40051 manual Test Setup, DC Input Source, Output Load, Fan

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SLUU161 – April, 2003

5 Test Setup

Figure 2 illustrates the basic test setup needed to evaluate the TPS40051EVM–001.

5.1DC Input Source

The input voltage source should be capable of supplying between 10 VDC and 14 VDC and rated for at least 4 A of current. For best results the input leads should be made with a wire of 18AWG or larger.

5.2Output Load

The output load can be either an electronic load or a resistive load configured to draw between 0 A and 15 A. The output leads should be made with a wire of 16AWG or larger diameter wire. Monitor the output voltage on the PCB by connecting a voltmeter to TP9 and TP10 to prevent voltage drops through PCB traces and the output terminal block which can lead to substantial measurement errors.

5.3Oscilloscope Probe Test Jacks

An oscilloscope probe test jack (TP8) has been included to allow monitoring the ourput voltage ripple.

5.4Fan

There is no cover to prevent the user from probing the internal circuit nodes. There are components that can get hot to the touch (above 60° C) in normal operation. A small fan delivering more than 15 cfm should be used when operating at and near full load.

VIN

 

VIN Test Points

 

 

10 V to 14 V

TP1 = VIN(+)

 

 

–

+

TP2 = VIN(–)

 

 

 

 

 

 

 

 

 

Fan

 

 

–

+

VOUT Test Points

 

 

TP9 = VOUT(+)

 

 

 

 

TP10 = VOUT(–)

 

 

VLOAD

 

 

 

 

1.8 V / 15 A

 

Figure 2. Test Setup

10TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195)

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Contents User’s Guide EVM Important Notice Dynamic Warnings and Restrictions Features IntroductionSchematic TPS40051EVM-001 SLUP195 SchematicFrequency of Operation Component SelectionTPS40051 Device Selection + R2 + f 17.82 10 *6 * 23 kInductance Value Uvlo CircuitryInput capacitor selection Output Capacitor Selection Mosfet selectionSnubber Component Selection Short Circuit ProtectionCompensation Components Output Load Test SetupDC Input Source Oscilloscope Probe Test JacksTest Results / Performance Data Efficiency and Power LossClosed Loop Performance EVM Assembly Drawing and PCB Layout Output Ripple and Transient ResponseTop Side Copper Internal Layer 2 Copper List of Materials TPS40051EVM-001 SLUP195 List of MaterialsReferences Important Notice

TPS40051 specifications

Texas Instruments TPS40051 is a highly integrated, synchronous step-down (buck) switching regulator designed to deliver power efficiently and effectively to various applications. This device is particularly well-suited for powering FPGAs, DSPs, microcontrollers, and other digital devices that require a stable voltage supply with high efficiency.

One of the main features of the TPS40051 is its ability to operate from a wide input voltage range of 4.5V to 17V. This flexibility makes it suitable for a variety of power sources, including battery-operated systems and traditional AC/DC power supplies. The output voltage can be adjusted from 0.8V to 85% of the input voltage, making it adaptable to different load requirements and application scenarios.

The TPS40051 employs a constant frequency, voltage mode control scheme, which results in improved transient response and stability. The device operates with a fixed switching frequency that can be set between 100kHz and 1MHz, allowing designers to optimize their designs for efficiency or minimize electromagnetic interference (EMI). The low RDS(on) of the integrated MOSFETs reduces conduction losses, contributing to the overall high efficiency of the solution, often exceeding 90%.

In terms of protection features, the TPS40051 includes overcurrent protection, thermal shutdown, and under-voltage lockout, which enhance the reliability of the system. These features allow the device to maintain safe operating conditions in various scenarios, protecting both the regulator and the load.

Another significant characteristic of the TPS40051 is its ability to operate in a Power Good mode. This feature provides feedback to the system regarding the status of the output voltage, allowing for better system monitoring and control. Additionally, it has an adjustable soft-start feature, which helps prevent inrush current during power-up, further protecting sensitive loads.

The TPS40051’s compact package options and its integration of features make it a flexible choice for designers looking to implement efficient power management solutions. Whether used in industrial, automotive, or consumer electronics applications, the TPS40051’s robust performance and adaptability make it an excellent choice for modern power supply designs.
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