High-voltage solid-state relay active precharge reference design


Design files


This reference design introduces an innovative circuit topology to precharge large DC link capacitors for hybrid electric vehicles (HEV) and electric vehicles (EV). The reference design features a system which does not require a microcontroller and can be operated with a 5-V supply. The reference design has reinforced isolation rating of 5-kVRMS with the TPSI3052-Q1. TPSI3052-Q1 device integrates a laminate transformer to achieve isolation while transferring signal and power to the secondary side. This removes the need for a discrete isolated bias supply. In addition, the TPSI3052-Q1 device can supply power to external circuitry located on the high voltage (HV) side to monitor current. This reference design can support up to 800-V systems with up to 4-AAVG changing current to charge up to 2-mF of load capacitance.

  • 5-kVRMS reinforced isolation
  • No isolated secondary supply required
  • 800-V maximum input/output voltage
  • 4-AAVG / 8-APK-PK maximum charging current
  • Capable of charging 2-mF capacitor to 800-V in 400-ms
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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.

TIDUF21A.PDF (1449 K)

Reference design overview and verified performance test data

TIDMB87.PDF (274 K)

Detailed schematic diagram for design layout and components

TIDMB88.PDF (155 K)

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

TIDMB89.PDF (200 K)

Detailed overview of design layout for component placement

TIDMB91.ZIP (2263 K)

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

TIDCGC7.ZIP (1598 K)

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

TIDMB90.PDF (595 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.


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Technical documentation

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Type Title Date
Design guide High-Voltage Solid-State Relay Active Precharge Reference Design (Rev. A) PDF | HTML Jan. 24, 2023

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