L6229Q STMicroelectronics, L6229Q Datasheet - Page 18
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L6229Q
Manufacturer Part Number
L6229Q
Description
Motor / Motion / Ignition Controllers & Drivers DMOS Driver for 3-phase DC motor
Manufacturer
STMicroelectronics
Type
3 Phase Brushless DC Motor Controllerr
Datasheet
1.L6229Q.pdf
(28 pages)
Specifications of L6229Q
Operating Temperature Classification
Commercial
Operating Supply Voltage (min)
8V
Operating Supply Voltage (max)
52V
Product
Stepper Motor Controllers / Drivers
Operating Supply Voltage
8 V to 52 V
Supply Current
3.55 A
Mounting Style
SMD/SMT
Package / Case
VQFN-32
Operating Temperature
+ 150 C
Lead Free Status / RoHS Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
L6229Q
Manufacturer:
ST
Quantity:
20 000
Circuit description
5.6
18/28
Tacho
A tachometer function consists of a monostable, with constant off time (t
is one hall effect signal (H
external op amp, as shown in
Information section.
The monostable output drives an open drain output pin (TACHO). At each rising edge of the
hall effect sensors H
TACHO is turned off for a constant time t
set using the external RC network (R
gives the relation between t
t
where C
20 kΩ … 100 kΩ.
By connecting the tachometer pin to an external pull-up resistor, the output signal average
value V
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 V
speed of the motor.
Figure 16. Tacho operation waveforms
PULSE
= 0.6 · R
M
PUL
is proportional to the frequency of the hall effect signal and, therefore, to the motor
should be chosen in the range 1 nF … 100 nF and R
PUL
V
· C
1
TACHO
, the monostable is triggered and the MOSFET connected to pin
V
H
H
H
PUL
M
1
2
3
1
). It allows developing an easy speed control loop by using an
PULSE
Figure
Doc ID 15209 Rev 3
and C
t
PULSE
V
17. For component values refer to Application
PUL
M
PUL
PULSE
, C
=
t
----------------- - V
PUL
PULSE
, R
V
T
DD
T
PUL
) connected to the pin RCPULSE.
(see
⋅
. We have approximately:
DD
Figure
16). The off time t
PUL
in the range
REF
PULSE
, which sets the
PULSE
), whose input
Figure 18
L6229Q
can be