ISOM8110: Active Parts?

johny radio

Expert 1280 points

Part Number: ISOM8110

Tool/software:

Does this device require any active parts? It seems to require only passive components.

Is this part a linear device? If not, does TI make a linear Opto-Emulator?

over 1 year ago

+1 Andrew J over 1 year ago

TI__Mastermind 34580 points

Hi Johny,

This part only requires passives components (resistors to limit the current). The part will have a flat CTR over lifetime and temperature compared to traditional optocouplers. Upgrade photoMOS, SSR and Push-Pull, Totem-Pole, or Transistor Output Optocouplers With Opto-emulators (Rev. A)

0 johny radio over 1 year ago in reply to Andrew J

Expert 1280 points

So it is linear, correct?

In this image from the datasheet, it's used as a voltage regulator. How can we use it as a voltage detector? Is I_c proportional to sensed voltage?

0 Andrew J over 1 year ago in reply to johny radio

TI__Mastermind 34580 points

Hello Johny,

The CTR is linear. The output current will scale linearly using the equation IC = IF * CTR. A simple resistor is all that is needed to sense voltage and create a proportional current.

Best,
Andrew

0 johny radio over 1 year ago in reply to Andrew J

Expert 1280 points

"A simple resistor is all that is needed"

R₁, R_in, or R_pullup?

0 Andrew J over 1 year ago in reply to johny radio

TI__Mastermind 34580 points

Hi Johny,

Sorry, I think I misunderstood your question.

What I mean is that ISOM8110 only needs an input resistor and a pull-up resistor in order to operate by itself. The below diagram is a good example (Cin and CL are optional.

Are you using the ISOM8110 for an isolated flyback controller as in the datasheet typical application?

Best,
Andrew

Isolation

Isolation forum

ISOM8110: Active Parts?