Texas Instruments TPS40051 manual EVM Assembly Drawing and PCB Layout

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SLUU161 – April, 2003

6.3Output Ripple and Transient Response

Figure 6 shows the typical output voltage ripple with IOUT=15 A to be less than 20 mVpp.

The transient response is shown in Figure 7 as the load is stepped from 5 A to 15 A. The voltage deviation is less than 60 mV.

OUTPUT VOLTAGE RIPPLE

TRANSIENT RESPONSE

IOUT = 15 A

VOUT = 50 mV/div

VRIPPLE (10 mV/div)

 

IOUT 5 A/div

t – Time – 1 ∝ s/div

t – Time – 200 ∝ s/div

Figure 6

Figure 7

7 EVM Assembly Drawing and PCB Layout

Figure 8. Top Side Component Assembly

12TPS40051-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 SchematicComponent Selection TPS40051 Device SelectionFrequency of Operation + R2 + f 17.82 10 *6 * 23 kUvlo Circuitry Inductance ValueInput capacitor selection Output Capacitor Selection Mosfet selectionShort Circuit Protection Snubber Component SelectionCompensation Components Test Setup DC Input SourceOutput Load Oscilloscope Probe Test JacksEfficiency and Power Loss Test Results / Performance DataClosed 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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