LM2776: The work mode

aggil liang

Part Number: LM2776
Other Parts Discussed in Thread: TPS723,

Hi Team

We find a question that LM2776 is work in PWM mode when the load current is 19 mA. But we can find LM2776 should be into PFM mode when the load current is below 40mA . What cause this ？

Another, When we move 3 pcs output capacitance closed LM2776 , and retain the next LDO TPS723 input capacitance. LM2776 work in PWM mode at any load. Do the circuit worl normal ?

PS: The value of C1+ between C1- is 104.

over 6 years ago

0 Chris Glaser over 6 years ago

TI__Guru**** 150870 points

Hi Aggil,

The 40 mA is a typical value at one operating condition. There is variation around this value.

As well, we have the LM27761 with a built in LDO. What do you need in your application?

I do not understand your second question. Can you rephrase it and explain what changed in the circuit?

0 Dorian Brillet de Cande over 6 years ago in reply to Chris Glaser

TI__Genius 14876 points

Hi Aggil,

We haven’t heard back from you.
Have you gathered up information about your request?
Do you have any follow up questions?
Otherwise we will assume you were able to resolve your issue. If not, just post a reply below .

Thank you,

Dorian

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LM2776: The work mode