參數(shù)資料
型號(hào)： TDF5140
廠商： NXP Semiconductors N.V.
英文描述： Brushless DC motor drive circuit
中文描述： 無(wú)刷直流電動(dòng)機(jī)驅(qū)動(dòng)電路
文件頁(yè)數(shù)： 12/19頁(yè)
文件大小： 120K
代理商： TDF5140
1999 March 15
12
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDF5140A
Adjustments
The system has been designed in such a way that the
tolerances of the application components are not critical.
However, the approximate values of the following
components must still be determined:
The start capacitor; this determines the frequency of the
start oscillator.
The two capacitors in the adaptive commutation delay
circuit; these are important in determining the optimum
moment for commutation, depending on the type and
loading of the motor.
The timing capacitor; this provides the system with its
timing signals.
T
HE START CAPACITOR
(CAP-ST)
This capacitor determines the frequency of the start
oscillator. It is charged and discharged, with a current of
2
μ
A, from 0.05 to 2.2 V and back to 0.05 V. The time
taken to complete one cycle is given by:
t
start
= (2.15
×
C) s (with C in
μ
F)
The start oscillator is reset by a commutation pulse and so
is only active when the system is in the start-up mode. A
pulse from the start oscillator will cause the outputs to
change to the next state (torque in the motor). If the
movement of the motor generates enough EMF the
TDF5140A will run the motor. 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:
I
p
J
where:
K
t
= torque constant (N.m/A)
I = current (A)
p = number of magnetic pole-pairs
J = inertia J (kg.m
2
)
f
osc
2
π
----------------------
------------K
=
Example: J = 72
×
10
-6
kg.m
2
, K = 25
×
10
-3
N.m/A, p = 6
and I = 0.5 A; this gives f
osc
= 5 Hz. If the damping is high
then a start frequency of 2 Hz can be chosen or t = 500 ms,
thus C = 0.5/2 = 0.25
μ
F, (choose 220 nF).
T
HE ADAPTIVE COMMUTATION DELAY
(CAP-CD
AND
CAP-DC)
In this circuit capacitor CAP-CD is charged during one
commutation period, with an interruption of the charging
current during the diode pulse. During the next
commutation period this capacitor (CAP-CD) is discharged
at twice the charging current. The charging current is
8.1
μ
A and the discharging current 16.2
μ
A; the voltage
range is from 0.9 to 2.2 V. The voltage must stay within this
range at the lowest commutation frequency of interest, f
C1
:
6
–
×
f
1.3
×
f
c1
(C in nF)
If the frequency is lower, then a constant commutation
delay after the zero-crossing is generated by the discharge
from 2.2 to 0.9 V at 16.2
μ
A.
maximum delay = (0.076
×
C) ms (with C in nF)
Example: nominal commutation frequency = 900 Hz and
the lowest usable frequency = 400 Hz, so:
400
(choose 18 nF)
The other capacitor, CAP-DC, is used to repeat the same
delay by charging and discharging with 15.5
μ
A. The same
value can be chosen as for CAP-CD. Fig.6 illustrates
typical voltage waveforms.
C
8.1
10
6231
------------
=
=
CAP-CD
6231
15.6
=
=
相關(guān)PDF資料
PDF描述
TDF5140A Brushless DC motor drive circuit
TDF5242 Brushless DC motor drive circuit
TDF5242T Brushless DC motor drive circuit
TDF8704 8-bit high-speed analog-to-digital converter
TDF8704T 8-bit high-speed analog-to-digital converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDF5140A 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Brushless DC motor drive circuit
TDF5140AP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Brushless DC motor drive circuit
TDF5140AP/C1,112 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Brushless DC Motor Controller 18-Pin 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
TDF5140AT/C1,118 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Brushless DC Motor Controller 18-Pin 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
TDF5242 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Brushless DC motor drive circuit
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

*
*
*