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參數(shù)資料
| 型號： | TDA5341 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Brushless DC motor and VCM drive circuit with speed control |
| 中文描述： | 無刷直流電動機驅(qū)動電路和氯乙烯的速度控制 |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 169K |
| 代理商： | TDA5341 |
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1997 Jul 10
10
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
If the amount of EMF generated is insufficient, then the
motor will move one step only and will oscillate in its new
position. The amplitude of the oscillation must decrease
sufficiently before the arrival of the next start pulse, to
prevent the pulse arriving during the wrong phase of the
oscillation. The oscillation of the motor is given by:
1
2
=
Where:
K
t
= torque constant (N.m/A)
I = current (A)
p = number of magnetic pole-pairs
J = inertia J (kg/m
2
).
Example: J = 6.34
×
10
7
kg/m
2
, K = 4.5
×
10
3
N.m/A,
p = 6 and I = 0.48 A; thus f
osc
= 22.7 Hz. Without
damping, a start frequency of 48.4 Hz can be chosen or
t = 24 ms, thus C = 0.024/0.78 = 0.031
μ
F, (choose
33 nF).
The Adaptive Commutation Delay
(CAPCDM and CAPCDS)
In this circuit capacitor CAPCDM is charged during one
commutation period, with an interruption of the charging
current during the diode pulse.
f
osc
0.5
K
t
I
P
J
×
×
×
During the next commutation period this capacitor
(CAPCDM) is discharged at twice the charging current.
The charging current is 10
μ
A and the discharging current
20
μ
A; the voltage range is from 0.87 to 2.28 V.
The voltage must stay within this range at the lowest
commutation frequency of interest, f
C1
:
6
–
f
C1
Where C is in nF.
If the frequency is lower, then a constant commutation
delay after the zero-crossing is generated by the discharge
from 2.28 to 0.87 V at 20
μ
A.
Maximum delay = (0.070
×
C) ms: Where C is in nF.
Example: nominal commutation frequency is 3240 Hz and
the lowest usable frequency is 1600 Hz, thus
CAPCDM = 7092/1600 = 4.43 (choose 4.7 nF)
The other capacitor, CAPCDS, is used to repeat the same
delay by charging and discharging with 20
μ
A. The same
value can be chosen as for CAPCDM. Figure 3 illustrates
typical voltage waveforms.
C
------------------------
f
10
1.41
×
7092
------------
=
=
Fig.3 CAPCDM and CAPCDS voltage waveforms in normal running mode.
handbook, full pagewidth
MGE820
voltage
on CAPCDS
voltage
on CAPCDM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA5341G | Brushless DC motor and VCM drive circuit with speed control |
| TDA5345HT | 5 V spindle & VCM driver combo |
| TDA5360 | Pre-Amplifier for Hard Disk Drive with MR-Read / Inductive Write Heads |
| TDA5360UH | Pre-Amplifier for Hard Disk Drive with MR-Read / Inductive Write Heads |
| TDA5360UK | Pre-Amplifier for Hard Disk Drive with MR-Read / Inductive Write Heads |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA5341G | 制造商:NXP Semiconductors 功能描述: |
| TDA5341G/C2 | 制造商:NXP Semiconductors 功能描述: |
| TDA5341GB-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Servo/Spindle Motor Controller/Driver |
| TDA5345HT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:5 V spindle & VCM driver combo |
| TDA5360 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Pre-Amplifier for Hard Disk Drive with MR-Read / Inductive Write Heads |
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