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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › What is the Duralite-voltage-regulato rs temperature range?
09-20-2009 08:31 AM  11 years ago
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saigon-heli

rrApprentice

Ho Chi Minh

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What is the Duralite-voltage-regulators temperature range?
Hi,

Background:

I bought Duralite Voltage Regulators output 5.3 volts, 7.5 Amp. As per the manual, I can use it with the battery up to 12 volts. For my setup on RC heli, I use all 5 digital servos (Futaba S9255 x 3 ea, S9254 x 1ea, S9650 x 1ea), the radio is 2.4 Ghz (JR 9303).

I set up the system with 11.1 volts (Lithium battery 3 cells) power supply, testing the system on the bench. I found the output voltage is quite stable with all the servo moving but the temperature of the regulator is quite high, the max recorded temperature is 160 degree F and the idle temperature is 134 degree F.

Questions:

1. Is it safe if I use 3 cells lithium battery with this regulator?
2. What is the normal temperature range of this regulator?
3. Let's say the temperature is always 160 degree during the flight, it is safe to fly the model in 20 to 25 minutes?

Thanks for the earliest response,
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09-20-2009 10:39 AM  11 years ago
Gyronut

rrProfessor

Martinsville In.

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I think you should swap out that 3S batt for a 2S...

That poor reg has to turn all that xtra volts into heat.... what a waste.
Rick
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09-20-2009 06:11 PM  11 years ago
Phil Cole

rrVeteran

Menlo Park CA

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Most consumer grade electronic components have an ambient temperature specification of 0 °C to 70 °C.

160 °F is 71 °C, so you are right at the upper limit. If you are measuring the temperature on the outside of the regulator (i.e. on the heatshrink) then the components inside will be hotter than this.

If the components used are also available in industrial grade (-20 to +85 °C) you will probably be OK since the only difference between parts made to the different temperature grades is the testing they go through during manufacture. They have to design the parts so they will operate at the higher temperatures, so they most likely will, despite being tested at a lower temperature.

If the actual temperature of the hottest component in the regulator is less than 85 °C (185 °F) it should be OK.

Given the amount of cooling air these things get tucked away inside a model it's quite possible you are exceeding this.

The failure rate of electronic components typically doubles for every 10 °C (18 °F) increase in operating temperature, so the cooler the better.
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09-22-2009 06:45 AM  11 years ago
saigon-heli

rrApprentice

Ho Chi Minh

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Hi Gyronut & Phil Cole,

Seems like that 3 cells is the limit of the regulator and ....I should not use it with 3 cells Lipo. I switched to 2 cells Lipo, the temperature of regulator under load drops to ~ 100 degree F.

By the way, I got the feedback from Duralite, they did not answer straight to my questions but as the way they told me I should only use 2 cells Lipo.

Thanks for your feedback and have a great day,
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