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參數(shù)資料
| 型號(hào)： | SI9961 |
| 廠商： | Vishay Intertechnology,Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 12-V Voice Coil Motor Driver |
| 中文描述： | 12 V的音圈電機(jī)驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 69K |
| 代理商： | SI9961 |
Si9961
Vishay Siliconix
Document Number: 70014
S-20883
—
Rev. G, 24-Jun-02
www.vishay.com
7
If a unit step voltage is applied to the above transfer function
and the inverse Laplace transform is taken, the output result is:
V
O
A
p
(x
p)x e
x
x
t
Where t =
time
As we can see, if x = p (i.e. if the VCM pole and compensation
amplifier zero = the transconductance closed loop pole), then
Vo reduces to A. In other words, a step input results in a step
output without overshoot. If x < p then a step input results in an
increased rise time output and no overshoot. If x > p, a step
input results in a step output with an overshoot.
If this overshoot is large enough, there may be a
cross-conduction condition in the output FETs.
Let us look at the above equation at t = 0 and t >> 0, expressed
in terms of the open loop high frequency voltage gain, A.
V
O
A
V
O
p
L
v
B
At t = 0
At t
0
In the example shown above, p = 10,000 and A = 9.8. This
means that there is some overshoot. At t = 0, the output voltage
is 9.8 V per volt of input. At some later time, it has dropped to
7.5 V per volt of input. An overshoot of 31 % is thus produced.
The
consideration, since it constitutes a potentially catastrophic
problem area. If we had decided to optimize for no overshoot,
A would equal 7.5, and hence the closed loop pole (A * B / Lv)
would be 10,000, which is a frequency of 1.592 kHz. This
would have resulted in a phase margin degradation of 13 at
the 367-Hz frequency desired. This may or may not be
acceptable. One must weigh the servo bandwidth, phase
margin degradation, and maximum voltage at the VCM for
each individual case.
maximum
overshoot
voltage
requires
careful
Result:
In the example for the 2081-Hz roll-off case with 31%
overshoot and proper pole cancellation, the compensation
values are:
R
L
=
C
L
=
6.2 k
0.016 F
In the example for the 1592-Hz roll-off case with no overshoot
and proper pole cancellation, the compensation values are:
R
L
=
C
L
=
4.7 k
0.022 F
The linearity of the transconductance amplifier (around a
center value of 500 mA/volt) is shown in Figure 2. In this case,
the output current sense resistors (R
SA
and R
SB
) were
tolerance, 0.5
contribute directly to mismatch between the positive and
negative
“
full-scale
”
. Including the external resistor mismatch,
the overall loop nonlinearity is approximately 1% maximum
over a
250-mV input voltage range.
5%
. Any mismatch between R
SA
and R
SB
5
4
2
–
3
–
5
–
300
–
200
–
100
0
100
200
300
3
1
–
4
–
2
0
–
1
E
V
IN
in mV
V
DD
= 12 V
R
SA
= R
SB
= 0.5
”
5%
R
m
= 52
G
m
= 500 mA/V
FIGURE 2.
Si9961 Transconductance
End Point Non-Linearity
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI9961A | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:12-V Voice Coil Motor Driver |
| SI9961ACY | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Voice Coil Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| SI9961ACY-E3 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Voice Coil Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| SI9961ACY-T1 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Voice Coil Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| SI9961ACY-T1-E3 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Voice Coil Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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