TPS61087: value of Rcomp

Y.Ottey

Part Number: TPS61087

Dear all,

Our customers rate TPS61087 under the following conditions:

Vin = 4V
Vout = 8V
L = 6.8μH (Fsw = 650kHz)
Cout = 44μF
Rcomp = 7.5kΩ
Ccomp = 2700pF

When I calculated Rcomp and Ccomp under the above conditions to check the circuit, the results were as follows.
* Calculation formula was as described in the data sheet

Rcomp = 22.776kΩ
Ccomp = 2061pF

Especially, the value of Rcomp is much smaller than the calculated value.
Does this have any operational problems such as device responsiveness?

Best Regards,

Y.Ottey

over 5 years ago

0 Helen chen over 5 years ago

TI__Mastermind 40080 points

Hi Ottey,

What is the effective output capacitance?

0 Helen chen over 5 years ago

TI__Mastermind 40080 points

Hi Ottey,

It depend on the effective capacitance. Generally should be OK!

0 Y.Ottey over 5 years ago in reply to Helen chen

Mastermind 6145 points

Dear Helen

Thank you for your reply.

”It depend on the effective capacitance.”
What does the above mean? For example, is it good that the effective capacitance is 7.5kΩ,

and is there a problem if the effective capacitance is smaller than that?

Regards,

Y.Ottey

0 Helen chen over 5 years ago in reply to Y.Ottey

TI__Mastermind 40080 points

Hi Ottey,

What I mean is effective output capacitance under the DC bias.

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TPS61087: value of Rcomp