5V In 33W Univ 4-Bit VID I/F AVS Pwr Supply for TCI6636K2H/6638K2H Reference Design


Design files


This reference design aims to supply the AVS core supply for Kepler DSPs like the C6638. The C66x series uses SmartReflex technology to enable the DSP to control its supply voltage. In order to meet this requirement, this design combines the TPS40303 Synchronous PWM Buck Controller with external CSD16325Q5 NexFETs, and a low-cost, four-transistor circuit to generate the required VID for the Core Supply AVS requirement. This solutions enables a universal 4-bi VID power supply for processors that need AVS implementation through 4-bit VID programming.


  • AVS Capability- dynamically adjust Vo through low-cost 4-bit discrete transistor circuit
  • <3% DC tolerance over full load, including LM10010 tolerance
  • 4.5V to 6V Input Voltage
  • 1V output at 25A  nominal current, 30A peak
  • 300KHz switching frequency
  • 89%  efficiency at 5V input, 1Vout at 25A

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU424.PDF (406 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDR833.PDF (54 K)

Detailed schematic diagram for design layout and components

TIDR834.PDF (21 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC497.ZIP (302 K)

Tool for calculating critical component values required in the reference design

TIDR837.ZIP (74 K)

Files used for 3D models or 2D drawings of IC components

TIDC496.ZIP (75 K)

Design file that contains information on physical board layer of design PCB

TIDR835.PDF (78 K)

PCB layer plot file used for generating PCB design layout

TIDR836.PDF (37 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

TPS403033-V to 20-V, 25-A, 300-kHz synchronous buck controller with FSS

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD16325Q525-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.2 mOhm

Data sheet document-pdfAcrobat PDF

Technical documentation

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Type Title Date
Test report PMP7208 Test Results Jun. 26, 2014

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