參數(shù)資料
型號(hào)： SI9993CS
廠商： Vishay Intertechnology,Inc.
英文描述： 12-V VCM/Spindle Motor Driver for Large Capacity HDD
中文描述： 12 V的氯乙烯/主軸電機(jī)驅(qū)動(dòng)器的大容量硬盤(pán)
文件頁(yè)數(shù)： 13/16頁(yè)
文件大?。?/td> 419K
代理商： SI9993CS
Si9993CS
Vishay Siliconix
FaxBack 408-970-5600, request 70653
www.siliconix.com
S-60752–Rev. A, 05-Apr-99
13
Power-Up Sequence
The POR timer receives the two supply undervoltage
detection outputs and combines them to form one output
called PowerFailure. If PowerFailure is low, the POR output
will remain low. After the power supplies are deemed safe,
PowerFailure goes high and the timer is turned on which holds
the POR output low for an additional 500 ms. If PowerFailure
goes back low while the timer is active, the POR output must
remain low and the timer must reset and wait for PowerFailure
to go back high before starting again.
The POR output must drop low within 1
μ
s from when a power
failure is detected. Once the POR output drops low, the timer
must also reset. If the PowerFailure output drops low for less
than 600 ns, then the power failure is ignored and the POR
output remains high and the timer is not reset. The POR
output cannot glitch at anytime. If a power failure is detected,
then the POR output must stay low for a minimum of 350 ms.
A minimum of 1 V of hysteresis exists at the POR comparator
which monitors the timer ramp voltage.
Recommended Parameter Setting Hardware Values and
Register Contents
Spindle
In order to perform some applications testing, some of the
registers should be preloaded and certain hardware values
installed. These are for a first approximation on an average
spindle motor and should be adjusted for the particular motor
and parameters that will be used.
All registers will default to 0 at power-up. The following
register value exceptions should be loaded for an average
motor load.
For start-up:
REG3 D7
→
D0 = 00000011; 8
°
Phase Advance, 13-
μ
S PWM
Off-Time
REG4 D7
→
D0 = 00000000; 1.4-
μ
S On-Time Blanking, 7/8
Off-Time, Slew Rate Off, Q-COM Off
REG5 D2
→
D0 = 000; 400-ns F/I Sample Time, F/I Speed-Up
On
After reaching speed:
REG3 D7
→
D0 = 00000001; 8
°
Phase Advance, 3.4-
μ
S PWM
Off-Time
REG4 D7
→
D0 = 00000111; 1.4-
μ
S On-Time Blanking, 7/8
Off-Time, Slew Rate On, Q-COM On
REG5 D2
→
D0 = 110; 40-ns F/I Sample Time, F/I Speed-Up
On
Hardware values:
Resistor from SRADJ to Ground = 20 k
for approximately
1-
μ
S Slew Rate
Capacitor from V
REF(in)
to Ground = 1
μ
F
VCM
The Si9993CS contains a transconductance amplifier to drive
the voice coil motor (VCM). For proper operation, this
amplifier must be compensated specifically for the VCM being
driven. As a first approximation, the torque constant and
inertia of the VCM may be ignored although they will have
some influence on the final results, especially if large.
The VCM transfer function of this simplified case may be
expressed in the s (Laplace) plane as:
Where
R
v
= VCM resistance in ohms
L
V
= VCM inductance in henrys
s is the Laplace operator
This has a pole at -R
v
/L
v
. It is desirable to cancel this pole in
the interest of stability. In order to do this, a compensation
amplifier is cascaded with the VCM and its driver. The transfer
function of this amplifier is:
Where
R
L
= compensation amplifier feedback resistor in ohms
C
L
= compensation amplifier feedback capacitor in farads
A = compensation amplifier and driver voltage gain at high frequency
If R
L
x C
L
is set equal to L
v
/R
v
, then the combined open loop
transconductance in siemens becomes:
Use these values as the series combination from COMP1 to
COMP2. The absolute values should be adjusted for the
desired open loop gain and closed loop bandwidth desired.
This has a single pole at the origin and is therefore stable
when the loop is closed.
g
v
1
L
-----
s
v
L
v
------
+
---------------
=
(1)
H
c
A
s
+
R
C
-------------------
+
-----------------------------------
×
=
(2)
g
to
v
--------------
=
(3)
相關(guān)PDF資料
PDF描述
Si9993CS 12-V VCM/Spindle Motor Driver for Large Capacity HDD(用于大容量硬盤(pán)驅(qū)動(dòng)的12V 語(yǔ)音線圈/心軸電機(jī)驅(qū)動(dòng)器)
SID1003 5phi Round Infrared LED
SID1003BQ 5phi Round Infrared LED
SID1G307C 5phi Round Infrared LED
SID300 5phi Round Infrared LED
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SI-A1125 制造商:DIOTEC 制造商全稱:Diotec Semiconductor 功能描述:High Voltage Si-Rectifier Modules Si-Hochspannungs-Gleichrichter Module
SI-A1125/500-6 制造商:DIOTEC 制造商全稱:Diotec Semiconductor 功能描述:High Voltage Si-Rectifier Modules Si-Hochspannungs-Gleichrichter Module
SI-A1125_09 制造商:DIOTEC 制造商全稱:Diotec Semiconductor 功能描述:High Voltage Silicon Rectifier Diodes
SI-A1125_13 制造商:DIOTEC 制造商全稱:Diotec Semiconductor 功能描述:High Voltage Silicon Rectifier Diodes
SIA1441 制造商: 功能描述: 制造商:undefined 功能描述:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*