PAD131 Thaler Corporation, PAD131 Datasheet - Page 4

• Manufacturer Part Number: PAD131
• Description: Fan Controller Module
• Manufacturer: Thaler Corporation

FAN CONTROLLER MODULE
PAD131
OPERATING CONSIDERATIONS
FAN CONTROLLER FUNCTION
Not all power amplifier applications require maximum cooling
of the amplifier. An amplifier capable of dissipating 100W, for
example, might not be required to dissipate more than 50W or
even less in its application circuit. Yet, in either case the
cooling fan will be operating at maximum rpm. Maximum fan
rpm will keep the amplifier at the lowest operating
temperature, but this may not be necessary even when
considering amplifier reliability.
Overall reliability also must consider the cooling fan. The
leading cause of fan failures is bearing wear. Even though the
L10 rating of the fans supplied with all of our amplifiers is 45k
hours some applications may benefit from an even longer life.
The PAD131 monitors the analog output (TMP) of host
amplifier and adjusts the rpm of the fan accordingly. As the
substrate temperature of the host amplifier rises, the rpm of
cooling fan increases and decreases the operating temperature
of the host amplifier. As the operating temperature of the host
amplifier rises to 65C, the PAD131 will increase the rpm of the
cooling fan from minimum (perhaps off) to maximum. When
the operating temperature of the host amplifier reaches 65C or
above maximum cooling is applied to the amplifier.
Any operating condition that allows the amplifier to operate at
a temperature lower than 65C can benefit from the PAD131
Fan Controller Module. At lower operating temperatures the
rpm of the fan decreases thus extending its life by reducing
bearing wear. At the same time, lower fan rpm results in less
audible fan noise.
Applications that require less than maximum cooling such as
applications where higher power dissipation in the amplifier is
intermittent will benefit the most.
The operating temperature of the host amplifier can be
predicted using the PAD Power Excel based design spreadsheet
available on the Thaler web site.
Thaler Corp 2015 N Forbes Blvd Tucson AZ 85745 USA Phone [phone] or [phone] Fax [phone] Web Site:
www.Thaler.com
4