Instruction/ maintenance manual of the product HPA070 Texas Instruments
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User ’s Guide 1 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) User ’ s G uide.
2 EVM IMPORT ANT NOTICE T exas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EV ALUA TION PURPOSES ONL Y and is not considered by TI to be fit for commercial use.
3 DYNAMIC W ARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 0 V DC to 14 V DC . Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.
SLUU186 − March 2004 4 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) Mark D ennis System Pow er Contents 1 Introduction 4 . . . . . . . . . . . . . . . . . . . .
SLUU186 − March 2004 5 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 3 Schematic + + Figure 1. TPS40055EVM−001 (HP A070) Schematic.
SLUU186 − March 2004 6 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 4 Component Selection 4.1 TPS40055 Device Selection Th e TPS4005x family of parts offers a range of output current configurations including source only (TPS40054), source/sink (TPS40055), or source/sink with V OUT prebias (TPS40057).
SLUU186 − March 2004 7 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 4.3 UVLO Circuitry The user programmable UVLO built into the TPS4005x provides hysteresis for transients shorter than a total count of seven cycles.
SLUU186 − March 2004 8 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 4.6 Output Capacitor Selection Selection of the output capacitor is based on many application variables, including function, cost, size, and availability .
SLUU186 − March 2004 9 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 4.8 Short Circuit Protection The TPS40055 implements short circuit protection by comparing the voltage across the topside MOSFET while it is ON to a voltage developed across R LIM due to an internal current source of 10 µ A inside pin 16.
SLUU186 − March 2004 10 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 5 T est Setup Figure 2 illustrates the basic test setup needed to evaluate the TPS40055EVM−001. 5.1 DC Input Source The input voltage source should be capable of supplying between 10 V DC and 14 V DC and rated for at least 4 A of current.
SLUU186 − March 2004 11 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 6 T est Results / Performance Data 6.1 Efficiency and Power Loss Figure 3 shows the efficiency as the load is varied from 1 A to over 15 A. The typical ef ficiency remains over 90% as the load ranges from 3 A to 12 A.
SLUU186 − March 2004 12 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 6.3 Output Ripple and T ransient Response Figure 6 shows the typical output voltage ripple with I OUT =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.
SLUU186 − March 2004 13 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) Figure 9. T op Side Copper Figure 10. Internal Layer 1 Copper.
SLUU186 − March 2004 14 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) Figure 1 1. Internal Layer 2 Copper Figure 12. Bottom Layer Copper.
SLUU186 − March 2004 15 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 8 List of Materials T able 1 lists the parts values of the evaluation board.
SLUU186 − March 2004 16 TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HP A070) 9 References 1. Data Sheet, TPS40055 Wide-Input Synchronous Buck Controller (SLUS593).
IMPORT ANT NOTICE T exas 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.
An important point after buying a device Texas Instruments HPA070 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Texas Instruments HPA070 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Texas Instruments HPA070 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Texas Instruments HPA070 you will learn all the available features of the product, as well as information on its operation. The information that you get Texas Instruments HPA070 will certainly help you make a decision on the purchase.
If you already are a holder of Texas Instruments HPA070, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Texas Instruments HPA070.
However, one of the most important roles played by the user manual is to help in solving problems with Texas Instruments HPA070. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Texas Instruments HPA070 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
