Bode Plot measurement without FB pin.

Hi! The LTC7883 uses an internal feedback mechanism for its control loop (See Image below):

Figure 1. LTC7883 Internal Feedback Loop (Taken From: LTC7883 (Rev. 0))

Bode Plot analysis can still be done using by adding the injection resistor at the V_SNSAOP pin (Demonstrated Below), similar to the usual injection setup.

Figure 2. LTC7883 and LTpowerAnalyzer Connection Setup

Upon checking on the DC3170A Evaluation Board for the LTC7883, there are provisions that can be used to insert the injection resistor and conduct a Bode Analysis.

Figure 3. DC3170A Evaluation Board (LTC7883) Resistor Provisions (Image taken from: dc3170a.pdf)

-Darz

Hi,

Thanks for this and will try it out.

Regards,

Abot