30W Active Clamp Forward Converter Reference Design


Design files


PMP11478 is an isolated active clamp forward converter accepts a voltage range of 24-36V and delivers a 12V output at 2.5A. This design uses the LM5026 active clamp current-mode controller. Output voltage regulation is maintained using an LMV431 shunt regulator and opto-coupler feedback. Schottky rectifiers allow for holdup of 2.5ms using the stored charge of the output capacitors. The isolation voltage is 2250 VDC meeting basic insulation requirements.

  • Active clamp forward control for higher power density
  • Isolated output
  • Synchronization capability
  • Wide bandwidth feedback for improved transient response
  • Overcurrent and hiccup protection
Output voltage options PMP11478.1
Vin (Min) (V) 24
Vin (Max) (V) 36
Vout (Nom) (V) 12
Iout (Max) (A) 2.5
Output Power (W) 30
Isolated/Non-Isolated Isolated
Input Type DC
Topology Forward- Active Clamp
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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.

TIDUBE2.PDF (1232 K)

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

TIDRK53.PDF (404 K)

Detailed schematic diagram for design layout and components

TIDRK54.PDF (135 K)

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

TIDRK55.PDF (96 K)

Detailed overview of design layout for component placement

TIDRK56.PDF (148 K)

Detailed overview of design layout for component placement

TIDRK58.ZIP (571 K)

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


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

TIDRK57.PDF (1102 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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

LM5026100-V active clamp current mode PWM controller with P or N-channel clamp FET and CS restart timer

Data sheet: PDF | HTML

CSD19533Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.5 mOhm

Data sheet: PDF | HTML
Shunt voltage references

LMV431A1%, low-voltage (1.24-V) adjustable precision shunt regulator

Data sheet: PDF

Technical documentation

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Type Title Date
* Test report PMP11478 Test Results Jan. 04, 2016

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