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ST STEVAL-A6983CV1 User Manual

ST STEVAL-A6983CV1 User Manual

Synchronous step-down switching regulator evaluation board based on a6983c
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Getting started with the STEVAL-A6983CV1 synchronous step-down switching
Introduction
The
STEVAL-A6983CV1
is based on A6983C synchronous step-down regulator which implements peak current mode
architecture in a VQFN package with internal compensation to minimize design complexity and size. The device is able to
deliver up to 3 A DC to the load.
The
STEVAL-A6983CV1
operates over an input voltage range of 6 V to 38 V to provide a regulated 5 V output at 400 KHz
switching frequency.
The board can be easily modified in order to obtain:
•
The preferred switching frequency, modifying the resistor connected to the FSW pin
•
The preferred power up threshold, modifying the resistors partition
•
The required output voltage, changing the feedback resistors partition
It is possible to use the
eDesignSuite
UM3308 - Rev 1 - February 2024
For further information contact your local STMicroelectronics sales office.
regulator evaluation board based on A6983C
software available on the ST website to configure A6983C to satisfy the specification.
Figure 1.
STEVAL-A6983CV1 board
UM3308
User manual
www.st.com

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Summary of Contents for ST STEVAL-A6983CV1

  • Page 1 The required output voltage, changing the feedback resistors partition It is possible to use the eDesignSuite software available on the ST website to configure A6983C to satisfy the specification. Figure 1. STEVAL-A6983CV1 board UM3308 - Rev 1 - February 2024 www.st.com...

  • Page 2: Getting Started

    • 200 kHz to 2.2 MHz programmable switching frequency • Optional spread spectrum for improved EMC • Power good • QFN16 (3 x 3 mm) package Block diagram Figure 2. STEVAL-A6983CV1 functional block diagram UM3308 - Rev 1 page 2/50...

  • Page 3: Connectors And Test Points

    (10%). Otherwise, it is short to the VOUT voltage. Input EMI filter The STEVAL-A6983CV1 is compliant with CISPR16-4-2. The suggested input filters help to reduce EMI. The network consists in a double Pi filter with an inductor (L2), a ferrite bead (L5), MLCC capacitors C18, C19, C20, and C30 an electrolyte capacitor used for a bulk energy storage.

  • Page 4: En Settings

    0.85 V. eDesignSuite The eDesignSuite software tool developed by STMicroelectronics helps you configure ST products for power conversion applications. You can use it to customize your board for a specific application. After entering the main specifications for your design, you can generate an automatic design or follow a sequential process to build a highly customized design.

  • Page 5: How To Use The Board

    UM3308 How to use the board How to use the board STEVAL-A6983CV1 is configurated with the A6983 LCM, which has an adjustable V . The board is set to deliver a 5 V output voltage with F = 400 kHz.

  • Page 6: Pcb Layout

    UM3308 PCB layout. PCB layout. Figure 3. STEVAL-A6983CV1 evaluation board - PCB layout (top layer) UM3308 - Rev 1 page 6/50...

  • Page 7: Figure 4. Steval-A6983Cv1 Evaluation Board - Pcb Layout (Bottom Layer)

    UM3308 PCB layout. Figure 4. STEVAL-A6983CV1 evaluation board - PCB layout (bottom layer) UM3308 - Rev 1 page 7/50...

  • Page 8: Stack Up Layers

    UM3308 Stack up layers Stack up layers Figure 5. STEVAL-A6983CV1 stack up layer UM3308 - Rev 1 page 8/50...

  • Page 9: Application 1 (Vout = 5 V, Fsw = 400 Khz)

    • from 6.5 to 38 V • = 5 V • = 0.4 MHz • = 3 A Schematic: Figure 6. STEVAL-A6983CV1 schematic - application 1 Coilcraft: MSS1048 Coilcraft: XAL6060 15uH VOUT VOUT A6983CQTR 100nF Type = 50V VIN1 VIN2...

  • Page 10: Oscilloscope Ack

    UM3308 Application 1 (VOUT = 5 V, FSW = 400 KHz) Oscilloscope ack Power up from EN • Yellow = EN • Green = inductor current • Blue = V • Violet = V Figure 7. = 6.5 V; V = 5 V;...

  • Page 11: Figure 13. Vin = 24 V

    UM3308 Application 1 (VOUT = 5 V, FSW = 400 KHz) Figure 13. = 24 V; V = 5 V; IOUT = 2.5 A Figure 14. = 38 V; V = 5 V; IOUT = 2.5 A ripple for light load operation = 6.5 V •...

  • Page 12: Figure 23. Vin = 24 V

    UM3308 Application 1 (VOUT = 5 V, FSW = 400 KHz) Figure 20. = 12 V; V = 5 V; IOUT = 0.1 A; V Figure 19. = 12 V; V = 5 V; no load; V OUT, OUT, RIPPLE ~ 35 mV 45 mV RIPPLE...

  • Page 13: Figure 25. Vin = 24 V

    UM3308 Application 1 (VOUT = 5 V, FSW = 400 KHz) Figure 25. = 24 V; V = 5 V; IOUT = 0.2 A; V Figure 26. = 24 V; V = 5 V; IOUT = 0.4 A; V OUT, OUT, ~ 30 mV ~ 10 mV...

  • Page 14: Figure 31. Vin = 8.5 V

    UM3308 Application 1 (VOUT = 5 V, FSW = 400 KHz) Figure 31. = 8.5 V; V = 5 V; V = 5.168 V; Figure 32. = 12 V; V = 5 V; V = 5.168 V; OUT, MAX OUT, MAX = 4.853 V = 4.887 V OUT, MIN...

  • Page 15: Performance Curves

    UM3308 Application 1 (VOUT = 5 V, FSW = 400 KHz) Performance curves Figure 35. Efficiency measures Figure 36. Efficiency measures log scale Figure 37. Power losses Figure 38. Load regulation UM3308 - Rev 1 page 15/50...

  • Page 16: Thermal Acquisitions

    UM3308 Application 1 (VOUT = 5 V, FSW = 400 KHz) Thermal acquisitions The measures have been acquired with: 1. T = 25 °C 2. I = 3 A The measures have been acquired leaving the device with the reported V and IOUT for more than 5 minutes.

  • Page 17: Application 2 (Vout = 5 V, Fsw = 400 Khz, Low Ac Ripple)

    • from 6.5 to 38 V • = 5 V • = 0.4 MHz • = 3 A Schematic: Figure 43. STEVAL-A6983CV1 schematic - application 2 Coilcraft: MSS1048 Coilcraft: XAL6060 15uH VOUT VOUT 10TPE220ML A6983CQTR 100nF Type = 50V VIN1...

  • Page 18: Oscilloscope Ack

    UM3308 Application 2 (VOUT = 5 V, FSW = 400 KHz, low AC ripple) Oscilloscope ack Power up from EN • Yellow = EN • Green = inductor current • Blue = V • Violet = V Figure 44. = 6.5 V; V = 5 V;...

  • Page 19: Figure 50. Vin = 24 V; Vout

    UM3308 Application 2 (VOUT = 5 V, FSW = 400 KHz, low AC ripple) Figure 50. = 24 V; V = 5 V; IOUT = 2.5 A Figure 51. = 38 V; V = 5 V; IOUT = 2.5 A ripple for light load operation = 6.5 V •...

  • Page 20: Figure 56. Vin = 12 V; Vout

    UM3308 Application 2 (VOUT = 5 V, FSW = 400 KHz, low AC ripple) Figure 57. = 12 V; V = 5 V; IOUT = 0.1 A; V Figure 56. = 12 V; V = 5 V; no load; V OUT, OUT, RIPPLE ~ 25 mV...

  • Page 21: Figure 10. In = 38 V

    UM3308 Application 2 (VOUT = 5 V, FSW = 400 KHz, low AC ripple) Figure 62. = 24 V; V = 5 V; IOUT = 0.2 A; V Figure 63. = 24 V; V = 5 V; IOUT = 0.45 A; V OUT, OUT, ~ 25 mV...

  • Page 22: Figure 8. Vin = 12 V

    UM3308 Application 2 (VOUT = 5 V, FSW = 400 KHz, low AC ripple) Figure 68. = 8.5 V; V = 5 V; V = 5.168 V; Figure 69. = 12 V; V = 5 V; V = 5.168 V; OUT, MAX OUT, MAX = 4.853 V...

  • Page 23: Performance Curves

    UM3308 Application 2 (VOUT = 5 V, FSW = 400 KHz, low AC ripple) Performance curves Figure 72. Efficiency measures Figure 73. Efficiency measures log scale Figure 74. Power losses Figure 75. Load regulation UM3308 - Rev 1 page 23/50...

  • Page 24: Application 3 (Vout = 3.3 V, Fsw = 400 Khz)

    • from 6.5 to 38 V • = 3.3 V • = 0.4 MHz • = 3 A Schematic: Figure 76. STEVAL-A6983CV1 schematic - application 3 Coilcraft: MSS1048 Coilcraft: XAL6060 8.2uH VOUT VOUT A6983CQTR 100nF Type = 50V VIN1 VIN2...

  • Page 25: Oscilloscope Ack

    UM3308 Application 3 (VOUT = 3.3 V, FSW = 400 KHz) Oscilloscope ack Power up from EN • Violet = EN • Yellow = SW • Blue = V • Green = I_SW Figure 77. = 6.5 V; V = 5 V; IOUT = 3.0 A Figure 78.

  • Page 26: Figure 28. In = 38 V

    UM3308 Application 3 (VOUT = 3.3 V, FSW = 400 KHz) Figure 83. = 24 V; V = 5 V; IOUT = 3.0 A Figure 84. = 38 V; V = 5 V; IOUT = 3.0 A ripple for light load operation = 6.5 V •...

  • Page 27: Figure 12. In = 12 V

    UM3308 Application 3 (VOUT = 3.3 V, FSW = 400 KHz) Figure 90. = 12 V; V = 3.3 V; IOUT = 0.1 A; V OUT, Figure 89. = 12 V; V = 3.3 V; no load; V OUT, RIPPLE ~ 20 mV RIPPLE 25 mV...

  • Page 28: Figure 30. In = 38 V

    UM3308 Application 3 (VOUT = 3.3 V, FSW = 400 KHz) Figure 95. = 24 V; V = 3.3 V; IOUT = 0.2 A; V Figure 96. = 24 V; V = 3.3 V; IOUT = 0.35 A; V OUT, OUT, ~ 15 mV ~ 10 mV...

  • Page 29: Figure 53. Vin = 6.5 V; Vout

    UM3308 Application 3 (VOUT = 3.3 V, FSW = 400 KHz) Figure 101. = 6.5 V; V = 3.3 V; V = 3.41 V; Figure 102. = 12 V; V = 3.3 V; V = 3.409 V; OUT, MAX OUT, MAX = 3.224 V = 3.223 V OUT, MIN...

  • Page 30: Performance Curves

    UM3308 Application 3 (VOUT = 3.3 V, FSW = 400 KHz) Performance curves Figure 105. Efficiency measures Figure 106. Efficiency measures log scale Figure 107. Power losses Figure 108. Load regulation UM3308 - Rev 1 page 30/50...

  • Page 31: Thermal Acquisitions

    UM3308 Application 3 (VOUT = 3.3 V, FSW = 400 KHz) Thermal acquisitions The measures have been acquired with: 1. TAMB = 25 °C 2. I = 3 A The measures have been acquired leaving the device with the reported V and IOUT for more than 5 minutes.

  • Page 32: Application

    • from 6.5 to 38 V • = 3.3 V • = 0.4 MHz • = 3 A Schematic: Figure 113. STEVAL-A6983CV1 schematic - application 4 Coilcraft: MSS1048 Coilcraft: XAL6060 8.2uH VOUT VOUT A6983CQTR 100nF Type = 50V VIN1 VIN2...

  • Page 33: Oscilloscope Ack

    UM3308 Application 4 (VOUT = 3.3 V, FSW = 400 KHz, low AC ripple) Oscilloscope ack Power up from EN • Violet = EN • Yellow = SW • Blue = V • Green = I_SW Figure 114. = 6.5 V; V = 5 V;...
  • Page 34 UM3308 Application 4 (VOUT = 3.3 V, FSW = 400 KHz, low AC ripple) Figure 120. = 24 V; V = 5 V; IOUT = 3.0 A Figure 121. = 38 V; V = 5 V; IOUT = 3.0 A ripple for light load operation = 6.5 V •...
  • Page 35 UM3308 Application 4 (VOUT = 3.3 V, FSW = 400 KHz, low AC ripple) Figure 127. = 12 V; V = 3.3 V; IOUT = 0.1 A; V OUT, Figure 126. = 12 V; V = 3.3 V; no load; V OUT, RIPPLE ~ 15 mV RIPPLE...
  • Page 36 UM3308 Application 4 (VOUT = 3.3 V, FSW = 400 KHz, low AC ripple) Figure 132. = 24 V; V = 3.3 V; IOUT = 0.2 A; V Figure 133. = 24 V; V = 3.3 V; IOUT = 0.35 A; V OUT, OUT, ~ 12 mV...
  • Page 37 UM3308 Application 4 (VOUT = 3.3 V, FSW = 400 KHz, low AC ripple) Figure 138. = 6.5 V; V = 3.3 V; V = 3.41 V; Figure 139. = 12 V; V = 3.3 V; V = 3.41 V; OUT, MAX OUT, MAX = 3.23 V...

  • Page 38: Performance Curves

    UM3308 Application 4 (VOUT = 3.3 V, FSW = 400 KHz, low AC ripple) Performance curves Figure 142. Efficiency measures Figure 143. Efficiency measures log scale Figure 144. Power losses Figure 145. Load regulation UM3308 - Rev 1 page 38/50...

  • Page 39: Schematic Diagrams

    Schematic diagrams Figure 146. STEVAL-A6983CV1 schematic diagrams Coilcraft: MSS1048 Coilcraft: XAL6060 15uH VOUT VOUT A6983CQTR 100nF Type = 50V VIN1 VIN2 VINLDO BOOT 0.01K SGND1 SGND2 Type = 16V EN/CLKIN size 0603 CLKIN EP1-SGND 0 Ohm PGOOD 402K size 0603...

  • Page 40: Bill Of Materials

    UM3308 Bill of materials Bill of materials Table 2. STEVAL-A6983CV1 bill of materials Item Q.ty Ref. Part/value Description Manufacturer Order code 10µF 50V, 1206 C1, C3, C4, X7R ceramic (3216 metric), CGA5L1X7R1H106K160AC C12, C13, C14 capacitor 50 V, +/- 10% 1µF 50V,...
  • Page 41 UM3308 Bill of materials Item Q.ty Ref. Part/value Description Manufacturer Order code 10Ω, 0603(1608 Resistor PANASONIC ERJ-U01F10R0C metric), +/-1% TP1, TP2, TP3, Single Male ETTINGER 13.14.145 TP4, Header AMPHENOL TP5, TP6, TP7, COMMUNICATI Strip line 4 pin 78511-204HLF SOLUTIONS 38 3 DCDC A6983CQTR UM3308 - Rev 1...

  • Page 42: Board Versions

    UM3308 Board versions Board versions Table 3. STEVAL-A6983CV1 versions PCB version Schematic diagrams Bill of materials STEVAL$A6983CV1A STEVAL$A6983CV1A schematic diagrams STEVAL$A6983CV1A bill of materials 1. This code identifies the STEVAL-A6983CV1 evaluation board first version. UM3308 - Rev 1 page 42/50...

  • Page 43: Regulatory Compliance Information

    UM3308 Regulatory compliance information Regulatory compliance information Notice for US Federal Communication Commission (FCC) For evaluation only; not FCC approved for resale FCC NOTICE - This kit is designed to allow: (1) Product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and (2) Software developers to write software applications for use with the end product.

  • Page 44: Revision History

    UM3308 Revision history Table 4. Document revision history Date Revision Changes 01-Feb-2024 Initial release. UM3308 - Rev 1 page 44/50...

  • Page 45: Table Of Contents

    UM3308 Contents Contents Getting started ..............2 Safety precautions .
  • Page 46 STEVAL-A6983CV1 bill of materials ........
  • Page 47 STEVAL-A6983CV1 evaluation board - PCB layout (bottom layer)....... . .
  • Page 48 STEVAL-A6983CV1 schematic - application 3 ........
  • Page 49 STEVAL-A6983CV1 schematic - application 4 ........
  • Page 50 ST’s terms and conditions of sale in place at the time of order acknowledgment. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of purchasers’...

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