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TDA1154 데이터시트(Datasheet) 4 Page - STMicroelectronics

부품명 TDA1154
상세내용  SPEED REGULATOR FOR DC MOTORS
PDF  6 Pages
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제조사  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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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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