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參數(shù)資料
| 型號(hào)： | L6235PD |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DMOS DRIVER FOR THREE-PHASE BRUSHLESS DC MOTOR |
| 中文描述： | DMOS的驅(qū)動(dòng)三相無刷直流電動(dòng)機(jī) |
| 文件頁數(shù)： | 14/25頁 |
| 文件大小： | 434K |
| 代理商： | L6235PD |
L6235
14/25
TACHO
A tachometer function consists of a monostable, with constant off time (t
PULSE
), whose input is one Hall Effect
signal (H
1
). It allows developing an easy speed control loop by using an external op amp, as shown in Figure
14. For component values refer to Application Information section.
The monostable output drives an open drain output pin (TACHO). At each rising edge of the Hall Effect Sensors
H
1
, the monostable is triggered and the MOSFET connected to pin TACHO is turned off for a constant time
t
PULSE
(see Figure 15). The off time t
PULSE
can be set using the external RC network (R
PUL
, C
PUL
) connected
to the pin RCPULSE. Figure 16 gives the relation between t
PULSE
and C
PUL
, R
PUL
. We have approximately:
t
PULSE
= 0.6 · R
PUL
· C
PUL
where C
PUL
should be chosen in the range 1nF … 100nF and R
PUL
in the range 20K
… 100K
.
By connecting the tachometer pin to an external pull-up resistor, the output signal average value V
M
is propor-
tional to the frequency of the Hall Effect signal and, therefore, to the motor speed. This realizes a simple Fre-
quency-to-Voltage Converter. An op amp, configured as an integrator, filters the signal and compares it with a
reference voltage V
REF
, which sets the speed of the motor.
Figure 14. Tacho Operation Waveforms.
V
M
t
T
-----------------
V
DD
=
T
t
PULSE
H
1
V
TACHO
H
2
H
3
V
M
V
DD
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| L6235Q | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 DMOS 3-Phase DC 5.6A 0.3 Ohm 100kHz 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 |
| L6235QTR | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 DMOS 3-Phase Brushless DC Motor 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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| L6237 | 制造商:STMicroelectronics 功能描述:BRUSHLESS DC MOTOR CONTROLLER, 2 A, 64 Pin Plastic QFP |
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