LSF0102-Q1: For spec of EN Low

Lee, Sam

Expert 4965 points

Part Number: LSF0102-Q1

Hi team,

For LSF0102-Q1, can you let me know about the Low level spec of EN pin?

Thanks,

Sam Lee

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 243110 points

The EN pin is not a digital input, but is connected directly to the gate of the reference transistor:

To deactivate the LSF, you can pull the EN pin low with any open-drain/open-collector driver (SN74xxx07) or transistor; see the training video Using the Enable Pin with the LSF Family.

0 Lee, Sam over 4 years ago in reply to Clemens Ladisch

TI__Expert 4965 points

Hi Clemens,

Thank you for your reply. I have one more question.

What is the sink current for 200kohm pull up? I need the spec for EN pin and Vref_B.

Thanks,

Sam Lee

0 Clemens Ladisch over 4 years ago in reply to Lee, Sam

Guru 243110 points

The threshold voltage is somewhere below 1 V. For the worst case, assume 0.5 V, which results in a current of (Vref_B − Vref_A − 0.5 V) / 200 kΩ flowing into Vref_A and out of Vref_B.

If you pull EN low, the current is Vref_B / 200 kΩ.

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LSF0102-Q1: For spec of EN Low