Texas Instruments TPS40051 User Manual
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Texas Instruments TPS40051 User Manual

Texas Instruments TPS40051 User Manual

Based design converts 12-v bus to 1.8 v at 15 a (slup195)
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User's Guide
TPS40051-Based Design Converts
12-V Bus to 1.8 V at 15 A (SLUP195)
User's Guide
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Summary of Contents for Texas Instruments TPS40051

  • Page 1 User’s Guide TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) User’s Guide...

  • Page 2: Evm Important Notice

    Texas 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 EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
  • Page 3 EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Copyright to 14 V Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 2003, Texas Instruments Incorporated...

  • Page 4: Table Of Contents

    1.8 V. The current requirements can range from below 1 A to over 15 A. For high-efficiency and small circuit size the TPS40051 wide-input synchronous buck controller can be used to provide the necessary control and drive functions to implement these converters. The TPS40051EVM–001 operates at 300 kHz and delivers 1.8 V at 15 A with efficiency over 90% for much of the load range, and a full...

  • Page 5: Schematic

    SLUU161 – April, 2003 Schematic Figure 1. TPS40051EVM–001 (SLUP195) Schematic TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195)

  • Page 6: Component Selection

    Frequency of Operation The clock oscillator frequency for the TPS40051 is programmed with a single resistor from RT (pin 2) to signal ground. The following equation (1) from the datasheet allows selection of RT in k frequency in kHz.
  • Page 7 0.25 V 10 V 300 kHz + 15 + 6.4 A TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) SLUU161 – April, 2003 range, to the module to drop when under calculation. . R4 can be calculated from equation .
  • Page 8 A schottky diode, D2, is placed across Q2 in this high current design to carry some of the high circulating current during short circuit conditions. TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) + 83 mF...
  • Page 9 Short Circuit Protection The TPS40051 implements short circuit protection by comparing the voltage across the topside MOSFET while it is ON to a voltage developed across R voltages are negative with respect to V DS(on) (max) + R9 + 1.12...

  • Page 10: Test Setup

    V IN 10 V to 14 V – TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) V IN Test Points TP1 = V IN (+) TP2 = V IN (–) –...

  • Page 11: Test Results And Performance Data

    Phase Gain 10 k f OSC – Oscillator Frequency – kHz Figure 5. TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) SLUU161 – April, 2003 LOAD I OUT – Output Current – A Figure 4 100 k...

  • Page 12: Output Voltage Ripple

    Figure 6 EVM Assembly Drawing and PCB Layout Figure 8. Top Side Component Assembly TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) =15 A to be less than 20 mVpp. TRANSIENT RESPONSE V OUT = 50 mV/div I OUT 5 A/div t –...
  • Page 13 SLUU161 – April, 2003 Figure 9. Top Side Copper Figure 10. Internal Layer 1 Copper TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195)
  • Page 14 SLUU161 – April, 2003 Figure 11. Internal Layer 2 Copper Figure 12. Bottom Layer Copper TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195)

  • Page 15: List Of Materials

    1812 1812 7343 (D) SOT23 0.80 x 0.35 0.512 x 0.512 Coiltronics LFPAK LFPAK PWP16 TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) SLUU161 – April, 2003 PART NUMBER Vishay VJ0805Y471KXAAT C4532X5R1C226MT C4532X5R0J476MT Sanyo 4TPD470M Vishay...

  • Page 16: References

    SLUU161 – April, 2003 References 1. Data Sheet, TPS40051 Wide-Input Synchronous Buck Controller, Texas Instruments Literature Number SLUS540. 2. Technical Brief, PowerPAD Thermally Enhanced Package, Texas Instruments Literature Number SLMA002 TPS40051-Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195)

  • Page 17: 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.

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