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TDA5147CH Datasheet(PDF) 11 Page - NXP Semiconductors

Part No. TDA5147CH
Description  12 V Voice Coil Motor VCM driver and spindle motor drive combination chip
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 11 page
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1997 Jul 09
11
Philips Semiconductors
Preliminary specification
12 V Voice Coil Motor (VCM) driver and
spindle motor drive combination chip
TDA5147CH
DISABLE VCM DRIVERS
With the VPCNTL signal at 0.5VCC the VCM drivers are
disabled while the rest of the circuits remain enabled.
A sleep mode is initiated when the spindle and VCM are
disabled (this places the TDA5147CH in its lowest power
setting).
ACTUATOR PARK
Retracting the actuator can be accomplished by driving
VPCNTL LOW in conjunction with either the spindle turning
or a brake voltage has been applied. An adjustable retract
voltage of 1.2 V (max.) is applied between the VCMN and
VCMP outputs. The retract circuit obtains its retract current
from the spindle BEMF (pins SHPWR2 and SHPWR3).
The retract voltage is determined by two external resistors.
One end is connected to pin VCMN and the other to ground.
The common point is connected to pin RETADJ (see Fig.8
for additional information).
The calculation of VRETRACT is as follows:
VBE = 0.65 V at 25 °C and ∆VBE/∆T= −2 mV/°C, 50 kΩ
can vary by
±30%. It should be noted that R2 has to be less
than 10 k
Ω.
Pin RETADJ can be pulled to ground by applying 0.7 V
(VBE) on pin BRKTC. This is used to perform spindle brake
during power down.
When pin 35 (RETADJ) is pulled to ground, no regulation of
the VCMN is taking place, but the VCMP output is still kept
LOW. In that case, the SHPWR2 and SHPWR3 lines are
loaded with the VCM motor by means of an internal MOS
transistor.
V
RETRACT
V
BE
R1
R2
+
R1
----------------------
R2
50 k
----------------
+


×
=
Table 3
Booster, spindle drivers, comparator, decoder, amplifier and filter modes
FUNCTION
UPPER
BOOSTER
UPPER
DRIVERS
LOWER
DRIVERS
COMPARATOR
CONTROL
AMPLIFIER
Spindle enable
ON
ON
ON
ON
ON
Spindle disable
ON
ON
ON
ON
ON
PORN LOW
OFF
OFF
ON
ON
OFF
Sleep
OFF
OFF
ON
ON
OFF
Fig.5 Block diagram of the VCM driver PWM filter.
handbook, full pagewidth
LEVEL
CONVERTOR
Vref
VIPWMH
VIPWML
VFLTOUT
SUM
LEVEL
CONVERTOR
32 : 1
ATTENUATION
UNITY
GAIN
LOW-PASS
MBH019




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