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Transcript
LM2747 www.ti.com SNVS370B â MARCH 2006 â REVISED MARCH 2013 CC3 = 2.7 nF±10%, RC1 = 39.2 kâ¦Â±1% RC2 = 2.55 kâ¦Â±1% (34) (35) The transfer function of the compensation block can be derived by considering the compensation components as impedance blocks ZF and ZI around an inverting op-amp: ZF GEA-ACTUAL = ZI (36) 1 1 x 10,000 + sCC2 sCC1 ZF = 10,000 + 1 1 + sCC1 sCC2 (37) RC1 RC2 + 1 sCC3 Z1 = RC1 + RC2 + 1 sCC3 (38) As with the generic equation, GEA-ACTUAL must be modified to take into account the limited bandwidth of the error amplifier. The result is: GEA-ACTUAL x OPG HEA = 1 + GEA-ACTUAL+ OPG (39) The total control loop transfer function H is equal to the power stage transfer function multiplied by the error amplifier transfer function. H = GPS x HEA (40) The bandwidth and phase margin can be read graphically from Bode plots of HEA as shown in Figure 33. 60 GAIN (dB) 40 20 0 -20 -40 100 1k 10k 100k 1M FREQUENCY (Hz) Submit Documentation Feedback Copyright © 2006â2013, Texas Instruments Incorporated Product Folder Links: LM2747 25
