Texas InstrumentsメーカーHPA070の使用説明書/サービス説明書
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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).
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