Automotive Engineering - October 2022 - 29

THERMAL MANAGEMENT FEATURE
KEEPING YOUR SILICON
COOL
Filling five locations on the
customer's PCB, each with a
different footprint and gap
height, was a challenge met
by Therm-A-Gap TC50.
A Parker Chomerics expert shares real-world solutions for the heat-dissipation
challenges in onboard electronics.
by Scott Casper
O
nboard electronics continue to evolve rapidly. Components are
smaller. Systems are more complex. The sophisticated electronics
components that make up modern vehicles require
precision heat dissipation for reliable operation. To help components
and systems designers deliver high-performance, cost-effective
solutions, the following are several actual cases illustrating the types of
thermal interface material (TIM) and their performance properties,
Challenge #1: The EV/HEV DC/DC converter
Manufacturers of electric and hybrid vehicles must cope with the demands
of increasing 12V and 24V accessories that are powered by a DC/
DC converter rather than a traditional alternator. This power converter
must be reliable, lightweight, and highly efficient, with low electromagnetic
interference and low current/voltage ripple. The heat that the converter
generates must be adequately dissipated through the housing. An
EV component supplier came to Parker Chomerics with a specific list of
TIM requirements for the converter they were developing.
The requirements included:
* High material flow rate for high-volume dispensing
* Lower compressive force than competitive gap pads and gels
AUTOMOTIVE ENGINEERING
* Thin bond line for smaller assembly gaps
* Low thermal impedance for effective heat transfer
* Reliability in vertical testing and high-vibration
applications
* Provide good dielectric strength to avoid breakdowns
Therm-A-Gap GEL 30 provided the ideal solution.
This highly conformable, pre-cured, single-component
compound offered a 20 grams/minute flow rate
with 3.5 W/m-K thermal conductivity. With a recommended
minimum bond line thickness of just 0.004inch
(0.10 mm), GEL 30 provided a solution for tight
tolerances and small assembly gaps within the converter.
As a material originally formulated for the
auto industry, GEL 30 was developed with vertical
applications and long-term vibration-exposure reliability
in mind. The manufacturer could easily dispense
the product in various patterns onto the heat
sink. A 300-cc cartridge solution was implemented
and will eventually convert to high-volume manufacturing
using a one-gallon pump unit and valve dispensing
system.
October 2022 29
PARKER CHOMERICS

Automotive Engineering - October 2022

Table of Contents for the Digital Edition of Automotive Engineering - October 2022

Automotive Engineering - October 2022 - Intro
Automotive Engineering - October 2022 - Sponsor1
Automotive Engineering - October 2022 - CVRA
Automotive Engineering - October 2022 - CVRB
Automotive Engineering - October 2022 - CVR1
Automotive Engineering - October 2022 - CVR2
Automotive Engineering - October 2022 - 1
Automotive Engineering - October 2022 - 2
Automotive Engineering - October 2022 - 3
Automotive Engineering - October 2022 - 4
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Automotive Engineering - October 2022 - CVR4
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