40-V isolated comparator-based power supply reference design
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Key Document


This reference design demonstrates a cost focused approach of an isolated power supplies with low current capability. The design consists of three designs of three different topologies. All three design options are based on a high voltage comparator TLV1805-Q1 which works as a free-running oscillator and a driver. All three are unregulated, and the ouptut voltage directly depends on the input voltage.

  • Automotive voltage input allows direct connection to car battery (Vin_max=40V)
  • Easy customizable for various applications
  • Low BOM cost
  • Tiny PCB area

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
Vin (Min) (V)888
Vin (Max) (V)363636
Vout (Nom) (V)71414
Iout (Max) (A).05.05.05
Output Power (W).35.7.7
Input TypeDCDCDC

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TLV1805-Q1  Automotive high volt comparator with push-pull output and shutdown  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TLV1805-Q1 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1537 04 Jun 2019
Design files (6)
Title Type Size (KB) Date
ZIP 339 21 May 2019
ZIP 639 21 May 2019
PDF 556 21 May 2019
PDF 155 21 May 2019
PDF 55 21 May 2019
PDF 294 21 May 2019

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