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參數(shù)資料
| 型號： | L6229QTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2.8 A, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 521K |
| 代理商： | L6229QTR |
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Circuit description
L6229Q
18/28
Doc ID 15209 Rev 3
5.6
Tacho
A tachometer function consists of a monostable, with constant off time (tPULSE), whose input
is one hall effect signal (H1). It allows developing an easy speed control loop by using an
external op amp, as shown in Figure 17. 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 H1, the monostable is triggered and the MOSFET connected to pin
gives the relation between tPULSE and CPUL, RPUL. We have approximately:
tPULSE = 0.6 RPUL CPUL
where CPUL should be chosen in the range 1 nF … 100 nF and RPUL in the range
20 k
Ω … 100 kΩ.
By connecting the tachometer pin to an external pull-up resistor, the output signal average
value VM is proportional to the frequency of the hall effect signal and, therefore, to the motor
speed. This realizes a simple frequency-to-voltage converter. An op amp, configured as an
integrator, filters the signal and compares it with a reference voltage VREF, which sets the
speed of the motor.
Figure 16.
Tacho operation waveforms
V
M
t
PULSE
T
------------------ V
DD
=
T
t PULSE
H1
VTACHO
H2
H3
VM
VDD
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