Isolated Auxiliary Flyback for Telecom Apps with 5V @ 300mA & 120V @ 80mA Reference Design


Design files


This design is an auxiliary flyback with telecom input range (36..60V) providing two outputs. The two outputs (5.0V @ 300mA and 12.0V @ 80mA) are isolated to the primary side as well as to each other.

Output voltage options PMP8580.1
Vin (Min) (V) 36
Vin (Max) (V) 60
Vout (Nom) (V) 5
Iout (Max) (A) .3
Output Power (W) 1.5
Isolated/Non-Isolated Isolated
Input Type DC
Topology Flyback- CCM
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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

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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


Includes TI products in the design and potential alternatives.

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

UCC3809-1Economy primary side controller with 10V/8V UVLO, 0C to 70C

Data sheet: PDF

Technical documentation

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Type Title Date
Test report PMP8580 Test Results Sep. 19, 2013

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