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TDA1154 Datenblatt(PDF) 4 Page - STMicroelectronics |
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TDA1154 Datenblatt(HTML) 4 Page - STMicroelectronics |
4 / 6 page 4/6 Figure 4. Application circuit If Eg and Rm are motor back electromotive force and motor internal resistance respectively, then: Eg + R m Im = Rt [I (5)+ V(ref) RS ] + V(ref) (b) From figure 2 it is seen that: I (8) = Im + V(ref) RS (c) Subsituting equations (a) and (c) into (b) yields: Eg = Im [ Rt K − Rm ] + + V(ref) [ Rt Rs ( 1 + 1 K )+ 1 ] + Rt IO (5)(d) The motor speed will be independent of the resist- ing torque if Eg is also independentof Im. Therefore, in order to determine the value of Rt term(1) in (d) must be zero: Rt = KR m (K = 20) If Rt > KRm, an instability may occur as a result of overcompensation. The value of RS is determinated by term (2) in (d) so as to obtain he back electromotive force (Eg) corresponding to required motor speed: RS = Rt V(ref) (1 + 1 / K) Eg − V(ref) − Rt IO (5) ≅ ≅ Rt V(ref) Eg − V(ref) − Rt IO (5 ) Where V(ref) = 1.2V and IO (5) = 1.7 mA (1) (2) TDA1154 |
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