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參數(shù)資料
| 型號(hào)： | TDA5345HT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 5 V spindle & VCM driver combo |
| 中文描述： | DISK DRIVE MOTOR CONTROLLER, 2 A, PQFP64 |
| 封裝： | LOW PROFILE, PLASTIC, TQFP-64 |
| 文件頁(yè)數(shù)： | 21/44頁(yè) |
| 文件大?。?/td> | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
21
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
(8)
If the VCM current I
VCM
can be considered as constant, the back-EMF becomes:
(9)
Figure 14 presents the VCM back-EMF amplifier as it is implemented in the TDA5345HT:
The first operational amplifier output voltage (OpAmpOut) is:
(10)
The VCM back-EMF amplifier output voltage (VcmBemf) is:
(11)
(12)
Fig.13 VCM motor model
Act+
VCM
Act-
I
VCM
R
VCM
L
VCM
VCM
back-EMF
I
VCM
Act+
Act-
<=>
+
V
VCM
e
+
V
VCM
R
VCM
I
VCM
×
(
)
L
VCM
dI
dt
---------------
×
e
+
+
=
e
V
VCM
R
VCM
I
VCM
×
(
)
–
=
Fig.14 VCM back-EMF amplifier
VcmBemf
VcmRef=1.482V
OpAmpOut
(31)
OpAmpInM
(ext.)
(ext.)
VcmSenseInM
VcmMinus
VCM
Rsense
(ext.)
(ext.)
R1
R2
2R
R
2R
(18)
R
VcmPlus
I
VCM
R = 10 k
(29)
(22)
(11)
(6)
(30)
OpAmpOut VcmSenseInM
=
R2
R1
Sense
I
VCM
×
×
–
VcmBemf 2
VcmPlus
OpAmpOut
–
(
)
×
VcmRef
+
=
VcmBemf 2
VcmPlus
VcmSenseInM
R2
R1
Sense
I
VCM
×
×
–
–
×
VcmRef
+
=
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