Gebruiksaanwijzing /service van het product TPS40090EVM-002 van de fabrikant Texas Instruments
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User ’s Guide 1 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 Vdc to100 Vdc. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.
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 .
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.
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 Lo.
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.
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).
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.
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.
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 th.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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