36V-75Vdc Input, 5V/50W 1/8 Brick Active Clamp Forward Reference Design


Design files


This reference design generates a 5V/10A output from a standard telecom 48V DC input. The UCC2897A controls an active clamp forward converter power stage. The low gate charge and low RDSon of the CSD17309Q3 and CSD18540Q5B, implemented as self-driven synchronous rectifiers, allow this design to achieve a max load efficiency over 93%.  This design uses only ceramic output capacitors for high reliability and uses 100% surface mount components.  The board is laid out on a standard eighth brick footprint.

  • Industry standard 1/8 Brick Footprint, 0.9" x 2.3" (23mm x 58mm)
  • High efficiency (greater than 93%)
  • All ceramic output capacitors
  • Self-driven synchronous rectifiers reduce drive complexity
  • 100% surface mount components
  • Low profile - 0.35" (9mm) maximum top side component height
Output voltage options PMP9108.1
Vin (Min) (V) 36
Vin (Max) (V) 75
Vout (Nom) (V) 5
Iout (Max) (A) 10
Output Power (W) 50
Isolated/Non-Isolated Isolated
Input Type DC
Topology Forward- Active Clamp^Forward- Synchronous
?? View video with transcript Video

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.

TIDU526.PDF (4038 K)

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


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement


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

TIDC610.ZIP (214 K)

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

TIDRAG1.PDF (1036 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD17309Q330-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 6.3 mOhm

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18540Q5B60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.2 mOhm

Data sheet: PDF | HTML
PWM controllers

UCC2897A110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection

Data sheet: PDF | HTML

Technical documentation

No results found. Please clear your search and try again.
View all 1
Type Title Date
Test report PMP9108 Test Results Sep. 10, 2014

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​