Precision Power Limiting Solution


Design files


This solution limits the power delivered to a maximum of 15W to ensure IEC60730 compliance in Human-Machine-Interaction (HMI) ports, making it very easy for the end equipment to meet the safety regulations.
This design uses TI’s TPS25921AD to monitor the voltage and current flowing through the connected system and controls the power output within 2%.  Along with the power limit function, TPS25921AD also protect against over voltage, under voltage, inrush current and short circuits.

  • Precisely limits the delivered power to less than 15W
  • Reduces solution size and cost while meeting requirement with increased safety and reliability
  • Provides multiple levels of protection to load and bus
  • No external controller and circuitry required



Output voltage options TIDA-00331.1
Vin (Min) (V) 4.5
Vin (Max) (V) 18
Vout (Nom) (V) 12
Iout (Max) (A) 1.25
Output Power (W) 15
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Hot Swap
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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.

TIDU581.PDF (307 K)

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

TIDRB22.PDF (108 K)

Detailed schematic diagram for design layout and components

TIDRB24.PDF (58 K)

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

TIDRB26.ZIP (426 K)

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


Includes TI products in the design and potential alternatives.

eFuses & hot swap controllers

TPS25921A4.5-V to 18-V, 90mΩ, 0.4-1.6A eFuse with auto retry fault response

Data sheet: PDF | HTML
eFuses & hot swap controllers

TPS259254.5-V to 5.5-V, 30mΩ, 2-5A eFuse

Data sheet: PDF | HTML
eFuses & hot swap controllers

TPS259264.5-V to 13.8-V, 30mΩ, 2-5A eFuse

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report TIDA-00331 Test Results Oct. 08, 2014
Technical article Making smart meter eFuses robust and reliable Jun. 28, 2017

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