ISOM8111: Minimum Primary Voltage?

johny radio

Expert 1280 points

Part Number: ISOM8111
Other Parts Discussed in Thread: ISOM8710

Tool/software:

What's the minimum input voltage that will trigger the output to go 100% high?

Does it depend on CTR?

6 months ago

0 Andrew J 6 months ago

TI__Mastermind 34555 points

Hi Johny,

ISOM8710 is designed for a logic output. If ISOM811x is used more design considerations need to be made. The input threshold is set by IF * CTR >>IC_max, where IC_max is the collector current limited by the pull-up resistance. The ISOM811x has a minimum forward current of 700uA, I reccomend designing above this range (at least 1mA) for added margin.

Higher CTR values will help improve switching times.

(+) [FAQ] ISOM8110: How do I design ISOM8110 to have the best timing performance for switching applications?

Best,
Andrew

0 johny radio 6 months ago in reply to Andrew J

Expert 1280 points

Thx. Which opto-emulator has lowest current requirement?

0 Andrew J 6 months ago in reply to johny radio

TI__Mastermind 34555 points

Hi Johny,

The ISOM811x is current the opto-emulator with the lowest current requirement.

Isolation

Isolation forum

ISOM8111: Minimum Primary Voltage?