L6235QTR STMicroelectronics, L6235QTR Datasheet - Page 16

• Manufacturer Part Number: L6235QTR
• Description: Motor / Motion / Ignition Controllers & Drivers DMOS 3-Phase Brushless DC Motor
• Manufacturer: STMicroelectronics

Specifications of L6235QTR

• Product Category: Motor / Motion / Ignition Controllers & Drivers
• Rohs: yes

Circuit description
4.6
16/33
Table 6.
Figure 14. 120° Hall sensor sequence
Figure 15. 60° Hall sensor sequence
Tacho
The tachometer function consists of a monostable, with constant OFF time (t
input is one Hall effect signal (H
an external op amp, as shown in
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
TACHO is turned off for a constant time t
set using the external RC network (R
gives the relation between t
Hall 120°
Phasing
Hall 60°
OUT1
OUT2
OUT3
t
H1
H2
H3
PULSE
H
3
= H
= H
H
3
1
H
1
= 0.6 · R
1
60 and 120 electrical degree decoding logic in forward direction
High Z
= L
= L
GND
1->3
H
H
Vs
H
H
1
2
1
1
L
L
2
H
3
PUL
H
3
High Z
2
H
· C
2
GND
2->3
1
Vs
H
H
2
2
L
PULSE
PUL
H
H
Doc ID 018997 Rev 2
H
1
2
2
1
). It allows to develop an easy speed control loop by using
Figure
H
and C
3
High Z
GND
2->1
3a
Vs
H
L
L
H
-
PUL
3b
3a
3
H
1
PULSE
17. For component values refer to
PUL
, C
H
H
H
PUL
, R
1
2
High Z
2
GND
2->1
Vs
3b
(see
H
H
H
PUL
H
-
) connected to the pin RCPULSE.
3
. It is approximately:
H
3
Figure
4
H
4
1
High Z
GND
3->1
Vs
H
H
4
4
L
H
H
H
1
2
2
16). The OFF time t
H
3
High Z
H
GND
5
3->2
3
5
H
Vs
H
1
5
5
L
L
H
H
H
1
2
2
H
High Z
GND
3
Section
1->2
Vs
6a
H
H
L
-
PULSE
H
PULSE
6b
3
6a
H
1
Figure 18
), whose
5.
L6235Q
H
H
High Z
H
GND
can be
1
2
1->2
2
6b
Vs
L
L
L
-