DC/DC Sync Buck Converter 48Vin to 8-30Vout 12A Reference Design


Design files


The TPS40170 controller with a pair 60V FETs from our CSD1835x offerings provide a complete high efficiency solution for non-isolated DC/DC needs off a regulated 48V input voltage. The attached design targeted 30V output at 12A and achieved 98% conversion efficiency. The same design was then adjusted to 8V output at same current and test results for this are also attached. The attached Test Reports include thermal images both with and without forced airflow. For lower current applications or applications with significant airflow; lower cost FETs from the CSD1835x series can be used. For outputs at 12Vouts or less, even at same 12A current; a smaller output choke can be used.

Output voltage options PMP8849.1
Vin (Min) (V) 46
Vin (Max) (V) 50
Vout (Nom) (V) 30
Iout (Max) (A) 12
Output Power (W) 360
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Synchronous
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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.


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

SLURA96.PDF (27 K)

Detailed schematic diagram for design layout and components

SLURA97.PDF (18 K)

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


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

TPS401704.5 V to 60 V Wide-Input Synchronous PWM Buck Controller

Data sheet: PDF | HTML

CSD18532Q5B60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 3.2 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP8849 Test Results Jun. 11, 2013

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