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| 型號： | SA56202 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | One-chip motor driver |
| 中文描述： | 單芯片電機(jī)驅(qū)動器 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 117K |
| 代理商： | SA56202 |
9397 750 12772
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Preliminary data sheet
Rev. 01 — 19 July 2004
10 of 24
Philips Semiconductors
SA56202
One-chip motor driver
I
LIM
can be chosen to be a fraction of this maximum current I
MAX
. By making the ratio
between R
LIM
(connected to pin 10) and R
REF
(connected to pin 8) this same fraction, I
LIM
is programmed as expressed in the following formula:
So by choosing I
LIM
, R
LIM
needs to be:
Figure 8
shows the limit current as a function of R
LIM
with R
REF
= 47 k
.
During accelerating and braking the motor current will not exceed I
LIM
. I
LIM
also sets the
transconductance gain I
LIM
/V
VINREF
of the spindle driver.
7.5 Programming R
EMF
The back-EMF voltage is internally regenerated. The ratio between R
EMF
and R
REF
is
used to scale the internal EMF regeneration. The value of external resistor R
EMF
depends
on the type of motor (k-factor and number of pole pairs N
PP
) and the motor supply voltage
V
DD(SPN)
. The following formula should be used to determine the R
EMF
resistor:
10
3
×
R
×
N
PP
V
DD SPN
)
with k in units Nm/A.
7.6 FG generator
The raw zero-crossings of the Hall sensors are first filtered and debounced before being
passed to the FG generator. The FG generator toggles its output at every filtered Hall
zero-crossing. For three Hall sensors this means that the motor frequency is linked to the
FG
3
N
PP
FG frequency by:
Fig 8.
Limit current I
LIM
as a function of external resistor R
LIM
.
I
LIM
R
R
REF
------------
I
MAX
×
=
R
LIM
I
I
MAX
------------
R
REF
×
=
R
LIM
(k
)
0
50
40
20
30
10
001aaa434
40
60
20
80
100
0
I
LIM
(% of I
MAX
)
R
EMF
--------------------------------------------------
×
=
f
motor
-------------------
=
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| SA5621EWA | 制造商:KINGBRIGHT 功能描述:* |
| SA56-21EWA | 功能描述:LED 顯示器和配件 Single Red 625nm Common Anode RoHS:否 制造商:Avago Technologies 顯示器類型:7 Segment 數(shù)位數(shù)量:2 字符大小:7.8 mm x 14.22 mm 照明顏色:Red 波長:628 nm 共用管腳:Common Anode 工作電壓:2.05 V 工作電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 35 C 封裝:Tube |
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