Texas Instruments TPS40090EVM-002 Using Manual Download Page 1 | Manualshive

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User’s Guide

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User’s Guide

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Summary of Contents for TPS40090EVM-002

Page 1: ...User s Guide 1 User s Guide ...

Page 2: ...e handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ...

Page 3: ...ertainty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 50 C The EVM is designed to operate properly with certain components above 50 C as long as the input and output ranges are maintained These components include but are not limited to linear regulators switching transistors pass transi...

Page 4: ...ut current can exceed 100 A The TPS40090 provides fixed frequency peak current mode control with forced phase current balancing Phase currents are sensed by the voltage drop across the DC resistance DCR of inductors Other features include a single voltage operation true differential output voltage sense user programmable current limit capacitor programmable soft start and a power good indicator De...

Page 5: ... A 160 mVPK Load transient response voltage change IOUT falling from 100 A to 10 A 200 mVPK Load transient response recovery IOUT rising from 10 A to 100 A 10 s Load transient response recovery time IOUT falling from 100 A to 10 A 15 µs Loop bandwidth IOUT 100 A IOUT 10 A 89 kHz Phase margin IOUT 100 A 40 Input ripple voltage 80 200 mVPK Output ripple voltage 15 25 mVPK Output rise time ms Operati...

Page 6: ...195 June 2004 6 TPS40090 Multi Phase Buck Converter and TPS2834 Drivers 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 Transient Generator ...

Page 7: ...ignal ground Equation 1 from the datasheet allows selection of the RT resistor in kΩ for a given switching frequency in kHz RT R12 KPH ǒ39 2 103 f 1 024 PH 7Ǔ kW where KPH is the coefficient that depends on the number of active phases fPH is the single phase frequency in kHz for 2 phase and 3 phase configurations KPH 1 333 for 4 phase KPH 1 0 is a single phase frequency kHz The RT resistor value i...

Page 8: ...value could be smaller than that in a single phase operation But from conduction loss point of view the inductor value tends to be big to reduce the ripple current thus losses 4 3 Input Capacitor Selection The bulk input capacitor selection is based on the input voltage ripple requirements Due to the interleaving of multi phase the input RMS current is reduced The input ripple current RMS value ov...

Page 9: ...the voltage ripple to a specified value if all the current is supplied by the onboard capacitor For a typical ripple voltage of 150 mV the maximum ESR is calculated in 5 as ESR D V D I 150 mV 3 18 A 47 mW Two 68 µF 20 V Oscon capacitors 20SVP68M from Sanyo are placed on the input side of the board The ESR is 40 mΩ for each capacitor 4 4 Output Ripple Cancellation and Capacitor Selection Due to the...

Page 10: ...ation Selection of the output capacitor is based on many application variables including function cost size and availability There are three ways to calculate the output capacitance 1 The minimum allowable output capacitance is determined by the amount of inductor ripple current and the allowable output ripple as given in equation 8 COUT min IRIPPLE 8 f VRIPPLE 3 41 A 8 420 kHz 10 mV 101 mF In thi...

Page 11: ...on for most of the cycle The conduction loss is dominant Low RDS on FET s are preferred Also due to the dV dt turn on of the rectifier FET s and cross conduction choose a rectifier FET with Qgs Qgd When the switch node is falling the Qgd can pull the gate of the lower FET below GND which upsets the driver Two Si7880DP from Siliconix are in parallel for the rectifier FET The RDS on of this FET is 3...

Page 12: ...it with Copper Temperature Compensation 4 7 Overcurrent Limit Protection The overcurrent function monitors the voltage level separately on each current sense input and compares it to the voltage on ILIM pin set by the divider from the controller s reference If the threshold of VILIM 2 7 is exceeded the PWM cycle on the respected phase is terminated Voltage level on the ILIM pin is determined by 11...

Page 13: ...lemented to provide one zero and two poles The first pole is placed at the origin to improve DC regulation The ESR zero of the power stage is fESRZ 1 2p RC COUT 354 kHz The zero is placed near 3 96 kHz to produce a reasonable time constant fZ 1 2p R11 C11 The second pole is placed at ESR zero 354 kHz fP1 1 2p R11 ǒǒC11 C12Ǔ ǒC11 C12Ǔ Ǔ The resulting values selected for this design are R11 40 2 kΩ ...

Page 14: ...e 5 A power supply capable of supplying 18 A should be connected to VIN and GND through a pair of 10 AWG wires The 1 5 V load should be connected respectively to J9 and J10 through pairs of 0 AWG wires Wire lengths should be minimized to reduce losses in the wires A 5 inch fan with 200 cfm air flow is recommended to operate this board at full load TPS40090EVM 002 Board J1 J2 J9 J10 Oscilloscope CH...

Page 15: ...over 100 A The efficiency at full load is about 84 3 Figure 7 shows the total loss versus the load current which is approximately 28 3W at 100 A 0 65 20 75 70 80 85 90 40 60 80 100 120 IOUT Output Current A Percent Efficiency OVERALL EFFICIENCY vs OUTPUT CURRENT Figure 8 VIN 12 V fSW 420 kHz 0 20 30 40 5 15 25 35 10 0 20 40 60 80 100 120 IOUT Output Current A P LOSS Power Loss W TOTAL POWER LOSS v...

Page 16: ...rossover frequency is at 89 kHz with phase margin of 40 100 0 40 1 k 10 k 100 k 1 M 80 60 40 20 20 180 45 135 90 0 45 135 180 90 GAIN AND PHASE vs OSCILLATOR FREQUENCY PHASE GAIN fOSC Oscillator Frequency kHz Gain dB Phase 5 VIN 12 V VOUT 1 5 V IOUT 10 A Figure 10 Bode Plot 6 3 Output Ripple and Noise Figure 11 shows typical output noise where VIN 12 V and IOUT 100A The output ripple is less than ...

Page 17: ...ect Pin1 and 2 of J3 a 90 A step load is created by three 50 mΩ resistors placed on the board The slew rates of the transient are 200 A µs for the load step down and 160 A µs for the load step up The transient response is shown in Figure 6 as the load is stepped from 10 to 100 A The output deviation is approximately 200 mV and the settling time is within 15 µs Load Step 90 A t Time 20 µs div Somet...

Page 18: ...is function can be enabled by shorting J11 on the board Figure 8 shows the start up waveform with pre biased output with J11 short and open respectively In Figure 12 there are two glitches of SYNC waveform The first one is cause by P5V from TPS40090 When TPS40090 is enabled P5V comes up first SYNC is connected to P5V through a divider The second one happens when the driver is ready and turns on th...

Page 19: ...tors after the junction where all the inductors are connected Place the external drivers right next to the FETs and use at least 25 mil trace for gate drive signal to improve noise immunity Place some ceramic capacitors in the input of each channel to filter the current spikes Place the NTC resistor right next to its related inductor for better thermal coupling 2 oz or thicker copper is recommende...

Page 20: ...June 2004 20 TPS40090 Multi Phase Buck Converter and TPS2834 Drivers Steps Down from 12 V to 1 5 V at 100 A 8 EVM Assembly Drawing and PCB Layout Figure 15 Top Side Component Assembly Figure 16 Bottom Assembly ...

Page 21: ...SLUU195 June 2004 21 TPS40090 Multi Phase Buck Converter and TPS2834 Drivers Steps Down from 12 V to 1 5 V at 100 A Figure 17 Top Side Copper Figure 18 Internal 1 Ground Plane ...

Page 22: ...SLUU195 June 2004 22 TPS40090 Multi Phase Buck Converter and TPS2834 Drivers 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 Converter 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: ...220 µF 2 5 V 15 mΩ 20 7343 D Sanyo 2R5TPE220M C48 C49 C52 C53 4 Capacitor Ceramic 10 µF 6 3 V X5R 1206 TDK C3216X5R0J106M D1 D2 D3 D4 D6 5 Diode dual schottky 200 mA 30 V SOT 23 Vishay Liteon BAT54C D7 D8 D9 D10 4 Diode zener 6 2 V 350 mW SOT 23 Diodes Inc BZX84C6V2 J1 J2 J9 J10 1 Lug Solderless 2 8 AWG 1 4 Copper 524600 ILSCO J4 J5 J6 J7 J8 5 Connector shielded test jack vertical 0 0125 DIA Johns...

Page 25: ... point black 1 mm 0 038 Farnell 240 333 LOAD TRANSIENT CIRCUIT Q17 1 MOSFET N channel 12 V 29 A 3 0 mΩ PWRPAK S0 8 Si7858DP Q18 0 MOSFET N channel 12 V 29 A 3 0 mΩ PWRPAK S0 8 Si7858DP R18 R19 R21 3 Resistor chip 0 050 Ω 1 W 0 5 2512 Vishay WSL 2512 R050 0 5 R86 R20 R22 0 Resistor chip 0 050 Ω 1 W 0 5 2512 Vishay WSL 2512 R050 0 5 R86 R23 R24 2 Resistor chip 10 Ω 1 16 W 1 603 Std Std R25 1 Resisto...

Page 26: ...tute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the third party or a license from TI under the patents or other intellectual property of TI Reproduction of information in TI data books or data sheets is permissible only if reproduction is...

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