650W Power Stage Without Heat Sink Reference Design for Low-Frequency Offline UPS and Inverters


Design files


This reference design is a 650-W inverter power stage designed for low-frequency (transformer-based), single-phase UPS operating from a 12-V battery. The design enables low form factor and high-efficiency implementation, taking advantage of the TI SMD MOSFET in a SON5x6 package with very low RDS(on) and low gate charge (Qg). Using two devices in parallel for each leg of the full-bridge power stage, the power stage eliminates the need of a heat sink, which reduces overall system cost.

  • Designed for standby or offline UPS from 100 VA to 850 VA; can be extended up to 1.5 kVA with additional FETs in parallel
  • Solution with SMD MOSFETs enhances manufacturability and assembly of UPS
  • No heat sink for power dissipation reduces system cost and production time
  • Tested and validated for 100-W to 650-W operation with bulb loads
  • Typical efficiency of ≈95%, maximum efficiency of >98.5%
  • Protections for overcurrent, short circuit, overvoltage, and undervoltage
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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.

TIDUD05B.PDF (3305 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRSU6.ZIP (2509 K)

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


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

TIDRSU5.PDF (2041 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD17573Q5B30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 1.45 mOhm

Data sheet: PDF | HTML
Analog current-sense amplifiers

INA18126-V bi-directional 350-kHz current-sense amplifier

Data sheet: PDF | HTML
Analog temperature sensors

LMT88±4°C analog output temperature sensor with -11.77-mV/°C gain

Data sheet: PDF | HTML
Half-bridge drivers

LM5101B2-A, 100-V half bridge gate driver with 8-V UVLO and TTL inputs

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV704150-mA 24-V ultra-low-IQ low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML
Shunt voltage references

LMV431B0.5%, low-voltage (1.24-V) adjustable precision shunt regulator

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide 650-W Power Stage Without Heat Sink Ref Design or Low-Frequency Offline UPS (Rev. B) Jun. 25, 2019

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