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User’s Guide

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TPS40055-Based Design Converts
12-V Bus to 1.8 V at 15 A (HPA070)

User’s Guide

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Summary of Contents for HPA070

Page 1: ...User s Guide 1 TPS40055 Based Design Converts 12 V Bus to 1 8 V at 15 A HPA070 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: ...s to implement these converters The TPS40055EVM 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 load efficiency of 88 The TPS40055 synchronous buck controller offers a variety of user programmable functions such as operating frequency soft start time voltage feed forward high side current limit and external loop compensation This con...

Page 5: ...SLUU186 March 2004 5 TPS40055 Based Design Converts 12 V Bus to 1 8 V at 15 A HPA070 3 Schematic Figure 1 TPS40055EVM 001 HPA070 Schematic ...

Page 6: ...portional to switching frequency drive voltage and the gate charge needed to enhance the N channel MOSFETs Effective heat removal allows the use of ultra small packaging while maintaining high component reliability The technical brief PowerPAD Thermally Enhanced Package 2 contains more information on the PowerPAD package 4 2 Frequency of Operation The clock oscillator frequency for the TPS40055 is...

Page 7: ...e VPD 8V and R4 is found to be 247 kΩ and a standard value of 243kΩ is selected Testing shows the startup voltage to be 9 2 V and the shutdown voltage to be 8 5 V 4 4 Inductance Value The output inductor L1 value used in the circuit of Figure 2 was selected from equation 4 L VOUT f IRIPPLE 1 VOUT VIN min in which IRIPPLE is usually chosen to be in the range between 10 and 40 of IOUT With IRIPPLE 2...

Page 8: ... load current Vf allowed transient voltage rise Vi initial voltage For compactness while maintaining transient response capability two 470 µF POSCAP capacitors C16 C17 are fitted in parallel The total ESR of these capacitors is approximately 5 mΩ An additional 47 µF 6 3 V ceramic capacitor C15 is placed in parallel with the POSCAPs to help suppress high frequency noise generated by the fast curren...

Page 9: ...capacitor C7 placed in parallel with R9 to filter the signal 4 9 Snubber Component Selection Initially the junction of Q1 Q2 and L1 was ringing at a frequency near 100 MHz with a peak voltage near 30 V This was due to the extremely fast switching speed of the MOSFETs and the lack of any cross conduction C13 was added to shunt the high frequency ringing to ground and the peak voltage is now below 2...

Page 10: ...a wire of 16AWG or larger diameter wire Monitor the output voltage on the PCB by connecting a voltmeter to TP9 and TP10 to prevent voltage drops through PCB traces and the output terminal block which can lead to substantial measurement errors 5 3 Oscilloscope Probe Test Jacks An oscilloscope probe test jack TP8 has been included to allow monitoring the ourput voltage ripple 5 4 Fan There is no cov...

Page 11: ...90 as the load ranges from 3 A to 12 A Figure 3 0 88 78 2 86 80 90 94 4 6 8 10 12 14 16 82 84 92 IOUT Output Current A Efficiency EFFICIENCY vs LOAD Figure 4 0 0 2 4 1 2 3 4 6 8 10 12 14 16 5 6 7 IOUT Output Current A P DISS Power Dissipation W POWER DISSIPATION vs LOAD 6 2 Closed Loop Performance 100 100 k 10 k 1 k 20 30 10 20 30 50 10 0 40 100 0 80 20 120 160 40 60 140 f Frequency kHz Gain dB Ph...

Page 12: ...IOUT 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 The voltage deviation is less than 60 mV Figure 6 t Time 1 µs div IOUT 15 A VRIPPLE 10 mV div OUTPUT VOLTAGE RIPPLE Figure 7 t Time 200 µs div VOUT 50 mV div IOUT 5 A div TRANSIENT RESPONSE 7 EVM Assembly Drawing and PCB Layout Figure 8 Top Side Component Assembly ...

Page 13: ...SLUU186 March 2004 13 TPS40055 Based Design Converts 12 V Bus to 1 8 V at 15 A HPA070 Figure 9 Top Side Copper Figure 10 Internal Layer 1 Copper ...

Page 14: ...SLUU186 March 2004 14 TPS40055 Based Design Converts 12 V Bus to 1 8 V at 15 A HPA070 Figure 11 Internal Layer 2 Copper Figure 12 Bottom Layer Copper ...

Page 15: ... D1 1 Diode switching 10 mA 85 V 350 mW SOT23 Vishay Liteon BAS16 D2 1 Diode schottky 3 A 40 V SMC IR 30BQ040 J1 J2 2 Terminal block 4 pin 15 A 5 1 mm 0 80 x 0 35 OST ED2227 L1 1 1 Inductor SMT 1 7 µH 22 3 A 1 8 mΩ 0 512 x 0 512 Coiltronics HC1 1R7 Q1 1 1 MOSFET N channel VDS 30 V RDS 6 mΩ ID 30 A LFPAK Hitachi HAT2168H Q2 1 1 MOSFET N channel VDS 30 V RDS 4 2 mΩ ID 40 A LFPAK Hitachi HAT2167H R1 ...

Page 16: ...2004 16 TPS40055 Based Design Converts 12 V Bus to 1 8 V at 15 A HPA070 9 References 1 Data Sheet TPS40055 Wide Input Synchronous Buck Controller SLUS593 2 Technical Brief PowerPAD Thermally Enhanced Package SLMA002 ...

Page 17: ...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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