12W SEPIC Power Supply Reference Design for Industrial Applications

(ACTIVE) TIDA-00781

Description & Features

Technical Documents

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Key Document

Description

The TIDA-00781 is a 12W SEPIC power supply reference design for industrial applications. It takes 12V nominal input voltage, and generates a 12V @ 1A output with 92% peak efficiency. The SEPIC converter topology allows voltage step-up and step-down conversion. The design covers a wide input range of 2.5V to 20V with a minimum start-up input voltage of 3.5V. When using a noisy 12V supply, the design can operate uninterrupted while maintaining a regulated 12V output. The reference design features the LM3481 as the SEPIC controller and uses a single coupled inductor to achieve compact solution size. The component area of the SEPIC is about 39 x 26 mm (1.5 x 1 inch). The reference board is layout-optimized for improved EMI performance.

The design can also use the output voltage to operate, which means after the output voltage reaches 12V under normal operating conditions, the input voltage can be reduced to as low as 2.5V with the system still maintaining output voltage regulation within 5%. Note that at input voltage of 2.5V, the high input current causes the inductor to heat up to over 130°C so this is not a recommended operating condition.

Features
  • Input: 2.5V to 20V (3.5V minimum start-up), IC capable up to 48V input
  • Outputs: 12V @ 1A
  • 12W total output power
  • Peak efficiency 92%
  • Switching frequency 500kHz
  • Output voltage ripple less than 50mV
  • Compact 4 layer board, 1oz outer, 0.5oz inner copper layers
  • Board Size: 76.2x54.8mm; solution size: 710.3 mm2

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  




Parametrics
 TIDA-00781.1
(Output Voltage 1)
Vin (Min) (V)2.5
Vin (Max) (V)20
Vout (Nom) (V)12
Iout (Max) (A)1
Output Power (W)12
Isolated/Non-IsolatedNon-Isolated
Input TypeDC
TopologySepic- CCM

TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD18503Q5A  40V N-Channel NexFET™ Power MOSFET, CSD18503Q5A  Power MOSFET  Sample & Buy Not Available
LM3481  High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters  Step-Up (Boost)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1148 19 Oct 2015 49
Design files (3)
Title Abstract Type Size (KB) Date Views
ZIP 318 19 Oct 2015 24
PDF 103 19 Oct 2015 17
PDF 261 19 Oct 2015 61


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