參數(shù)資料
型號(hào)： TDA5345HT
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 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)： 22/44頁(yè)
文件大?。?/td> 213K
代理商： TDA5345HT
1999 June 10
22
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
(13)
Where:
(14)
and if you set:
(15)
you get:
(16)
(17)
VCM ramp unload sequence :
The VCM ramp unload sequence can be ordered by either the serial interface or by internal emergency procedures:
power down or temperature shut down.
It will not start if VcmSleep bit is ‘1’
, because the actuator is supposed to be
on the ramp already.
Three different states are programmable : first a VCM brake, second a VCM slow retract and then a VCM full power
retract.
In all cases, the spindle isolation switch is cut off. If the power transistors are still supplied, the VCM current will come
from the power supply, through the isolation switch parasitic diode. If the power transistors are no more supplied, the
VCM current will come from the spindle itself. It is used as a generator, thanks to its back-EMF.
When the sequence is initiated by a Power down detection, PorN signal will not go up until the end of the sequence.
Figure 14 shows the link created between the spindle and the VCM power structures to transfer the spindle energy to
the actuator :
VcmBemf 2
V
(
cmPlus
VcmSenseInM
)
R2
R1
Sense
I
VCM
×
×
+
–
×
VcmRef
+
=
V
VCM
VcmPlus
VcmSenseInM
–
(
)
–
=
R2
Sense
×
R
VCM
=
VcmBemf
2
–
V
VCM
R
VCM
I
VCM
×
–
(
)
×
=
VcmRef
+
VcmBemf
2
–
e
×
=
VcmRef
+
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