1kW Triple-Rail Isolated DC/DC Digital Power Supply for Telecom (-8V@.25A)


Design files


This reference design demostrates full-function 1.2KW triple-rail digital power supply solution for telecom application. The input range is 36-60Vin and outputs are two 48V10A(Full bridge) and one 5.5V30A(active clamp). Synchrounous rectifiers are used in the design and the overall efficiency is up to 92%@full load. The full-feature digital solution includes soft start, power up/down sequencing,fast response to input dip, protection features as OVP, OCP, OTP and input UVLO. Other devices like LM34927, UCC27324, UCC27201 are also used to provide bias supply and drive the FETs.

Output voltage options PMP4333.1 PMP4333.2 PMP4333.3 PMP4333.4
Vin (Min) (V) 36 36 36 36
Vin (Max) (V) 60 60 60 60
Vout (Nom) (V) 48 48 5.5 -8
Iout (Max) (A) 10 10 30 .25
Output Power (W) 480 480 165 2
Isolated/Non-Isolated Isolated Isolated Isolated Isolated
Input Type DC DC DC DC
Topology FlyBuck^Forward- Active Clamp FlyBuck^Forward- Active Clamp FlyBuck^Forward- Active Clamp FlyBuck^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.

SLUUAI1.PDF (1708 K)

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

SLURA84.PDF (361 K)

Detailed schematic diagram for design layout and components

SLURA85.PDF (210 K)

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

SLUUAI2.PDF (2247 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)

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

UCD3138Highly Integrated Digital Controller for Isolated Power with 3 Feedback Loops and 8 DPWM Outputs

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AC/DC & DC/DC converters (integrated FET)

LM349277.5-100V Wide Vin, 600mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters

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Low-side drivers

UCC27324Non-inverting 4-A/4-A dual-channel low side gate driver

Data sheet: PDF | HTML

Technical documentation

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View all 2
Type Title Date
Technical article How to achieve higher system efficiency- part two: high-speed gate drivers PDF | HTML Jan. 31, 2017
Test report PMP4333 Test Results May 24, 2013

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