Hi All,
How to Measure Bode plot??
A resistor is connected in series between the feedback and output
I has add a resistance is connected in between the feedback and VDCDC1 / VDCDC2 / VDCDC3 pin. Is this right?
My test curve result failed. As following picture.
Do you have any bode plot data of TPS65023 could share to us ??
Hi Pao Wu,
Your resistor looks to be connected properly, it should sit between the between the VDCDC3 and the FB node. However, I would typically recommend a termination/reference resistor with a value of 20ohm-100ohm. You currently have a 10ohm resistor, I would use a 50ohm resistor for your test. Also, what does your test setup look like? Are you using the injection transformer? Below is a reference using the Venable Model 3215.
Hi ,
Following picture is 50 ohm test result.
It's same.
Do you have curve could share to us??
Hi Pao Wu,
Below is the Phase-Gain diagram for DCDC3, let me know what you think. This was tested under the following conditions:
Vin= 3.7V
Vout=1.1V
Cout= 2 x 10uF = 20uF
Inductor= 2.2uH
Termination Resistor = 50ohm
Iload = .8A
-Ray
