LM5045: if SLOOP pin and RAMP pin are pull them to GND at maximam duty cycle

user1257299

Prodigy 90 points

Part Number: LM5045

Hi Expert.

I have an add question.

If the outputs operate at maximam duty cycle, the comp pin will open.

And then Is it ok SLOOP pin and RAMP pin are pull them to GND?

over 5 years ago

0 Peter Meaney over 5 years ago

TI__Mastermind 31580 points

You can connect SLOPE to ground. The RAMP pin is normally connected to an RC circuit where the R is connected to the input voltage and the C is discharged at the end of each clock cycle.

If RAMP is connected to ground there is no sawthooth waveform for COMP signal to be compared against hence the Controller should operate at max duty cycle.

Are you operating the LM5045 open loop, with no feedback?

Regards

Peter

0 user1257299 over 5 years ago in reply to Peter Meaney

Prodigy 90 points

Hi Expert

I operate the LM5045 open loop, with no feed.

Therefore, I try COMP pin is open.And RAMP is connect to GND.

Where Can I connect SLOPE? (maybe SLOPE is open....)

Regards

0 Peter Meaney over 5 years ago in reply to user1257299

TI__Mastermind 31580 points

Hi,

The slope pin needs to be connected to Ground if not used see section 7.3.10 of the datasheet.

Regards

Peter

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LM5045: if SLOOP pin and RAMP pin are pull them to GND at maximam duty cycle