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)： 19/44頁(yè)
文件大?。?/td> 213K
代理商： TDA5345HT
1999 June 10
19
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
When the 6-bit DAC is used for the spindle, the LSB current is set externally, by means of a 33 k
resistor (to have a
very good absolute accuracy). The Spindle Current limit is then set by 31 steps of 20 mA. Please note that only the
positive codes of the 6-bit DAC can be used, so only (2
5
- 1) = 31 steps can be defined.
Table 8
Spindle Start-up current limit according to the spindle 6-bit DAC code :
When the 6-bit DAC is used for the VCM section, the LSB current is set by an internal resitor to have a good matching
with the 2 internal resistors used to set the VCM loop Gain. The VCM current offset is set by steps of :
(4)
Table 9
VCM current offset according to the spindle 6-bit DAC code (assuming that R
Sense
= 1
, 1 LSB = 1.613 mA) :
VCM driver
The VCM is a linear, AB class type with both low-side and high-side drivers configured as a H-bridge. The zero-current
reference voltage for the VCM loop is internally set at Vdd5/2=2.5 V. The sense resistor R
sense
enables the VCM current
to be measured through the sense amplifier. The gain of the sense amplifier is internally set to typically 3. The output
VcmSenseOut is given by the following equation:
(5)
Figure 14 presents the VCM sense amplifier.
INPUT CODE
SPINDLE START-UP CURRENT
000000
000001
011111
0 mA
20 mA
620 mA
INPUT CODE
VCM OFFSET CURRENT
011111
000000
1111111
100001
100000
+50 mA
0
μ
A
-1.613 mA
-50 mA
-50 mA
I
VCMOffset LSB
)
R
Sense
3
–
1.613 10
( )
=
VcmSenseOut 3
VcmSenseInP
VcmSenseInM
–
(
)
VcmRef
+
×
=
R
I
VCM
VcmSenseInP
VcmSenseInM
+
-
Fig.11 VCM sense amplifier
R
R
3R
3R
VcmRef
R = 10 k
23
22
18
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