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TDA5147CH Datenblatt(PDF) 10 Page - NXP Semiconductors

Teilenummer TDA5147CH
Bauteilbeschribung  12 V Voice Coil Motor VCM driver and spindle motor drive combination chip
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Hersteller  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA5147CH Datenblatt(HTML) 10 Page - NXP Semiconductors

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1997 Jul 09
10
Philips Semiconductors
Preliminary specification
12 V Voice Coil Motor (VCM) driver and
spindle motor drive combination chip
TDA5147CH
ENABLE VCM DRIVERS
When VPCNTL equals VCC5, the VCM drivers are controlled
by VIPWMH and VIPWML. Their duty factor is converted to a
voltage at pin VFLTOUT. At a 100% duty factor the VFLTINP
voltage is approximately 1 V above Vrefout. At a 0% duty
factor the VFLTINP voltage is approximately 1 V below
Vrefout. At a 50% duty factor, the voltage level is equal to
Vrefout (typically 4 V). The VFLTINP voltage is amplified,
filtered and output at VFLTOUT. The voltage at VFLTOUT
varies between
±2 V about V
refout. The VFLTOUT voltage, in
conjunction with the sense resistor amplifier, drives the
two VCM drivers as illustrated in Fig.4. The equation
describing the transconductance from VFLTINP to Icoil is:
In a typical application:
The transconductance is variable by selecting external
resistors R2/R1 and sense resistors RS.
G
m
I
coil
V
VFLTINP
V
refout
--------------------------------------------
2I
coil
V
VFLTOUT
V
refout
()
-----------------------------------------------------
2
1
gain
-----------
R2
R1
--------
1
RS
-------- A/V
×
×
×
=
=
=
I
coil
V
FLTINP
V
refout
--------------------------------------------
2
4
---
6.6 k
10 k
------------------
×
1
0.33
-----------
×
1 A/V
=
=
Fig.4 Transconductance model.
handbook, full pagewidth
V1
V1
61
4R
R
R
4R
R
0.5 VCCV12
R
51
59
Vrefout
RS
60
57
Vrefout
45
R2
R1
R
4
Vrefout
BUFFER
PWM
DEC
R
3
2
1
MGG846
M
voice
coil
motor
ICOIL
VISENL
VCMN
VCMP
VISENH
VISENS1
VCMINP
VFLTINP
VIPWMH
VIPWML
VFLTOUT


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