LM73606: Startup Time after Enable

Jim Gavin

Part Number: LM73606

Figures 65-68 of the datasheet appear to show a delay (approximately 800 us) between the EN pin going high and the start of the ramp on the output (see image below). However, the Soft Start timing characteristics in section 6.6 of the datasheet indicate that the soft-start time starts on the rising edge of the EN pin. Is there an internal delay between the rising edge of the EN pin and the control logic starting to switch the high side FET?

over 2 years ago

0 Arief Hernadi over 2 years ago

TI__Mastermind 23815 points

Hi Jim,

Yes, your assesment is correct. There will be a delay between EN pin rising and the internal circuitry that control the switching cycle.

Thanks

-Arief

0 Jim Gavin over 2 years ago in reply to Arief Hernadi

Intellectual 920 points

Thanks for Confirming. Can you provide a specification or a range for what that delay is?

0 Arief Hernadi over 2 years ago in reply to Jim Gavin

TI__Mastermind 23815 points

Hi Jim,

When i look at the electrical characteristic table, unfortunately this delay is not characterized.
It is lumped together with the soft-start timing (EN rising until PGOOD high) metric.

Thanks

-Arief

0 Jim Gavin over 2 years ago in reply to Arief Hernadi

Intellectual 920 points

Can you reach out to the factory to get more detailed specifications?

0 Arief Hernadi over 2 years ago in reply to Jim Gavin

TI__Mastermind 23815 points

Hi Jim,

Yes, i will try to reach out to factory to see if they have more information

Thanks

-Arief

0 Arief Hernadi over 2 years ago in reply to Arief Hernadi

TI__Mastermind 23815 points

Hi Jim,

After confirming with the factory, unfortunately we do not have this data available. We only have the soft-start time data

Thanks

-Arief

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LM73606: Startup Time after Enable