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TDA5345HT Datenblatt(PDF) 21 Page - NXP Semiconductors

Teilenummer TDA5345HT
Bauteilbeschribung  5 V spindle & VCM driver combo
PDF  44 Pages
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Hersteller  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA5345HT Datenblatt(HTML) 21 Page - NXP Semiconductors

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1999 June 10
21
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
(8)
If the VCM current IVCM 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-
IVCM
RVCM
LVCM
VCM
back-EMF
IVCM
Act+
Act-
<=>
+
VVCM
e
+
V
VCM
R
VCM
I
VCM
×
(
)
L
VCM
dI
VCM
dt
----------------
×


e
+
+
=
eV
VCM
R
VCM
I
VCM
×
(
)
–
=
Fig.14 VCM back-EMF amplifier
VcmBemf
VcmRef=1.482V
OpAmpOut
OpAmpInM
(ext.)
(ext.)
VcmSenseInM
VcmMinus
VCM
Rsense
(ext.)
(ext.)
R1
R2
2R
R
2R
R
VcmPlus
IVCM
R = 10 k
Ω
(31)
(29)
(18)
(22)
(11)
(6)
(30)
OpAmpOut
VcmSenseInM
R1
R2
--------
R
Sense
I
VCM
×
×


–
=
VcmBemf
2
VcmPlus
OpAmpOut
–
(
)
×
VcmRef
+
=
VcmBemf
2
VcmPlus
VcmSenseInM
R1
R2
--------
R
Sense
I
VCM
×
×
〈
〉
–


–
×
VcmRef
+
=



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