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Texas Instruments TPS40090EVM-002 manual

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Table of contents for the manual

  • Page 1

    User ’s Guide 1    User ’ s G uide[...]

  • Page 2

    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. As such, the goods being provided may not be complete in terms [...]

  • Page 3

    3 DYNAMIC W ARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 0 Vdc to100 Vdc. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the inpu[...]

  • Page 4

    SLUU195 − June 2004 4 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A TPS40090 Multi-Phase Buck Converter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A Systems Powe r Contents 1 Introduction 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 5

    SLUU195 − June 2004 5 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A 2 Features T able 1. TPS40090EVM−002 Performance Summary P ARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input voltage range 10.5 12.0 14.0 V Output voltage set point 1.477 1.508 1.540 V Output current range V IN = 12 V 0 100 120 A[...]

  • Page 6

    SLUU195 − June 2004 6 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A TRANS_EN Figure 2. TPS40090EVM−002 Schematic Part 2 − Driver Circuit and Load T ransient Generator[...]

  • Page 7

    SLUU195 − June 2004 7 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A + + + 1.5V/100A + + + + + Figure 3. TPS40090EVM−002 Schematic Part 3 − Power Stage 4 Component Selection 4.1 Frequency of Operation The clock oscillator frequency for the TPS40090 is programmed with a single resistor from RT ([...]

  • Page 8

    SLUU195 − June 2004 8 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A 4.2 Inductance V alue The output inductor value for each phase can be calculated from the volt-second during off time, shown in equation (2). L + V OUT f I RIPPLE ǒ 1 * V OUT V IN(max) Ǔ where • I RIPPLE is usually chosen to [...]

  • Page 9

    SLUU195 − June 2004 9 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A 0 0.1 0.2 0.5 0.6 0.4 0.3 0 1 0 2 03 04 05 0 6 07 08 09 01 0 0 Duty Cycle − % I RMS_CIN(nom) − Normalized RMS Input − A N PH = 1 N PH = 2 N PH = 3 N PH = 4 N PH = 6 Figure 4. Input Ripple Current RMS V alue Overload Current [...]

  • Page 10

    SLUU195 − June 2004 10 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A where • D is the duty cycle for a single phase • N PH is the number of active phases • K (N PH ) is the intermediate function for calculation In this case, N PH =4 and D min =0.107 which yields k=0.573. The actual output r[...]

  • Page 11

    SLUU195 − June 2004 11 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A 3. T ransient consideration. An additional consideration in the selection of the output inductor and capacitance value can be derived from examining the transient voltage overshoot which can be initiated with a load step from ful[...]

  • Page 12

    SLUU195 − June 2004 12 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A With the chosen inductor described in Inductance V alue , (section 4.2, of this document) the following values are used. • R=19.6 k Ω • C=10 nF • R NTC =100 k Ω • R1=124 k Ω • R2=22.6 k Ω UDG−03136 R L DCR C [...]

  • Page 13

    SLUU195 − June 2004 13 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A 4.8 Compensation Components The TPS40090 uses peak current mode control. T ype II network is used here, which is implemented to provide one zero and two poles. The first pole is placed at the origin to improve DC regulation. The [...]

  • Page 14

    SLUU195 − June 2004 14 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A 5 T est Setup The HP A072 has the following input/output connections: 12-V input J1 (VIN) and J2 (GND), 1.5-V output J9 (VOUT) and J10 (GND). A diagram showing the connection points is shown in Figure 5. A power supply capable o[...]

  • Page 15

    SLUU195 − June 2004 15 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A 6 T est Results and Performance Data 6.1 Efficiency and Power Loss Figure 8 shows the efficiency as the load varies from 10 A to over 100 A. The ef ficiency at full load is about 84.3%. Figure 7 shows the total loss versus the lo[...]

  • Page 16

    SLUU195 − June 2004 16 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A 6.2 Closed-Loop Performance The TPS40090 uses peak current-mode control. Figure 10 shows the bode plots at 100 A of load current, where no droop function is implemented. The crossover frequency is at 89 kHz with phase margin of [...]

  • Page 17

    SLUU195 − June 2004 17 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A 6.4 T ransient Response The on-board load transient circuit enables to check the step load transient response on the same board. Simply by putting a jumper to connect Pin1 and 2 of J3, a 90-A step load is created by three 50-m ?[...]

  • Page 18

    SLUU195 − June 2004 18 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A 6.5 Start up with Pre-Biased Output In synchronous buck converter , the bottom FET discharges the pre-biased output during start-up. T o avoid this, a comparator U9 and surround components are used to pull the SYNC pin of the dr[...]

  • Page 19

    SLUU195 − June 2004 19 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A 7 Layout Considerations The PCB layout plays a critical role in the performance in a high frequency switching power supply design. Following the suggestions listed below will help to improve the performance and expedite the desig[...]

  • Page 20

    SLUU195 − June 2004 20 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A 8 EVM Assembly Drawing and PCB Layout Figure 15. T op Side Component Assembly Figure 16. Bottom Assembly[...]

  • Page 21

    SLUU195 − June 2004 21 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A Figure 17. T op Side Copper Figure 18. Internal 1 (Ground Plane)[...]

  • Page 22

    SLUU195 − June 2004 22 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A Figure 19. Internal 2 (Power Plane) Figure 20. Internal 3[...]

  • Page 23

    SLUU195 − June 2004 23 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A Figure 21. Internal 4 Figure 22. Bottom Layer Copper[...]

  • Page 24

    SLUU195 − June 2004 24 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Dr ivers Steps-Down from 12-V to 1.5-V at 100 A 9 List of Materials The following table lists the TPS40090EVM−002 components corresponding to the schematic shown in Figure 1. T able 2. List of Materials Reference Designator QTY Description Size Manufacturer Part Number C1, [...]

  • Page 25

    SLUU195 − June 2004 25 TPS40090 Multi-Phase Buck Conv erter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A Reference Designator QTY Description Size Manufacturer Part Number R27, R28, R29, R30 4 Resistor , chip, 2.2 Ω , 1/10−W , 1% 805 Std Std R31, R32,R35, R36 4 Resistor , chip, 19.6 k Ω , 1/10−W , 1% 805 Std Std R33, R34, R3[...]

  • Page 26

    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. Customers should obtain the latest relevant information before placing orde[...]