CR Magnetics Forums

I am interested in using the CR5400 in one of our inverter applacations. But I need more information.

I found the PDF on your website.

In regards to the 12VDC power supply, typically we spec our products to work down to 9V and up to 16VDC.

Do you have more detail information on the delay from sensing current over a set point to when the output transistor activates ?

Your specifications on the website indicate that the CR5395 has a current sensing range of DC to 1KHZ. As I explained on the phone, we will be switching at 12KHZ. Will the product be derated when operated at 12KHZ ?

If the "Time On Delay" is selected to be option X, can the "Trip Point" still be set via the dial or does it have to be fixed ?

Also I noticed that the operating temperature rating is different on the specifications page on the website than on the PDF. Which is correct ?

If the temperature rating is to +70° C, what happens when it gets hotter, say 80° ?
We would be interested in getting a sample unit with the following features:

· 12V DC supply

· Trip status set to LH

· Trip range 6 to 60A AC or DC

· Time delay set to X

· Trip point dial CD

· Output NPN transistor

· Internal transformer

Dear Sir,

12 Volt DC can work down to about 11 VDC. After that, it gets a bit squirrely and affects the sensing range.

With no delay, typically the output transistor will react within 8-10 mS.

The DC to 1Khz comes from using Nyquist’s theorem of 1/10 of the chopping frequency. We could make a special unit to chop at a higher frequency and get a reasonable 12 Khz response.

The trip point can still be adjustable with an X time delay. They are separate circuits.

Increased heat in the unit will cause sensing capability to be limited. The CT response begins to change. I looked at the website PDF and the PDF I sent you and I believe they are the same. The operating range is –30 to 70C.