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Tl1454A - Theory and design

Other Parts Discussed in Thread: TL1454A

Hi, I noted an error in the datasheet of the TL1454A at http://www.ti.com/lit/ds/symlink/tl1454.pdf . If one takes the formulas for R1 and R2 on page 4 and directly include them in the expression for Vo just above (still on page 4), we do not obtain Vo = Vo.  The formulas for R1 and R2 must be be swapped.

Also, in the "Designing with the TL1454 PWM Controller" document at http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=slvu012&fileType=pdf , the transfert function from Vo to COMP on page 32 seems incorrect. I made a rigorous derivation from the schematic of Fig. 2-3 on page 31 and obtained a different gain expression than the one given. Moreover, plotting the magnitude and phase of the gain (the correct one) with the design values obtained in the document does not yield the curves shown in Fig. 2-4.