參數(shù)資料
型號(hào)： TDA5345HT
廠商： NXP SEMICONDUCTORS
元件分類： 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)： 20/44頁(yè)
文件大?。?/td> 213K
代理商： TDA5345HT
1999 June 10
20
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
The error amplifier compares the VcmDacOut(49) input command and the VcmSenseOut(18) sense amplifier output
signal to generate the control voltage of the power drivers.
(6)
Finally, the transconductance gain of the VCM loop is given by the following equation:
(7)
VCM 12-bit resistive ladder DAC:
The VCM loop input voltage is provided by an internal signed 12-bit resistive ladder DAC. The output voltage is a linear
function of the input code written in register #7 (low gain) or register #8 (high gain), bits [11:0] :
Table 10
Dac12 output voltage versus the input code (1 LSB = 125
μ
V) when writing in register #7 :
Table 11
Dac12 output voltage versus the input code (1 LSB = 500
μ
V) when writing in register #8 :
Warning
: at power up, the 12-bit DAC needs to be programmed so that it is in a defined state.
VCM back-EMF amplifier
To prevent any actuator crash on the disk when a ramp load is used, an internal VCM back-EMF amplifier is build to
monitor the actuator speed. Indeed, the VCM back-EMF is a picture of the actuator speed. The voltage across the VCM
motor is divided in several contributions:
INPUT CODE
DAC12 VOLTAGE
(7FF)
H
(000)
H
(FFF)
H
(800)
H
1.732 V -1 LSB
1.482 V
1.482 V -1 LSB
1.232 V
INPUT CODE
DAC12 VOLTAGE
(7FF)
H
(000)
H
(FFF)
H
(800)
H
2.482 V - 1LSB
1.482 V
1.482 V -1 LSB
0.482 V
R
s
I
VCM
SENSE
AMPLIFIER
ERROR
AMP
to the power
drivers
+
-
+
-
R
in
R
FB
VcmCompensIn
VcmInput
G=3
Fig.12 VCM transconductance gain schematic.
VcmSenseInP
VcmSenseInM
23
22
VcmRef
18
VcmCompensOut
17
20
19
VcmDacR
VcmRef
–
in
VcmSensR
VcmRef
–
FB
3
----------------------------------I
R
R
FB
VCM
=
=
G
VCM
A
( )
V
( )
[
]
I
VcmDacOut
VcmRef
–
-----------------------------------------------------------------
R
R
in
----------
3
R
sense
×
-----------1
×
R
sense
---0.4
=
=
=
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