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TPS63020-Q1: Some questions about using TPS63020 as a TEC driver

Part Number: TPS63020-Q1
Other Parts Discussed in Thread: TPS63020

I use TPS63020 as a TEC drvier。

I use the  Equations  in the article SLVA677 to calculate the value of the R1,R2 and R3 。

I want to understand the relationship between the TEC current and the frequency, amplitude and duty cycle of the Vcrtl.