3235 Просмотр технического описания (PDF) - Allegro MicroSystems
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3235 Datasheet PDF : 8 Pages
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3235
DUAL-OUTPUT
HALL-EFFECT SWITCH
SWITCH POINTS vs. TEMPERATURE
TRANSFER CHARACTERISTICS
150
100
BOPS
BRPS
50
25 V
MAX
V OUT(OFF)
B OP2
B OP1
0
-50
-100
BRPN
BOPN
-150
0
-50 -25
0
25
50
75 100 125 150
-B
AMBIENT TEMPERATURE IN °C
Dwg. GH-027-1
APPLICATIONS
BRP2
BRP1
0
MAGNETIC FLUX
VOUT(SAT)
+B
Dwg. GH-043A
Figure 1 illustrates a method of sensing the presence
of either a north or south magnetic pole. Because the
UGN3235K is an open-collector device, it is possible to
directly connect (wired OR) the two outputs. This causes
the output to go LOW when either a north pole or south
pole of sufficient magnitude is sensed. The device
connected in this manner suits many applications, ranging
from doubling the resolution of a ring-magnet encoder, to
zero-crossing detection.
VCC
4.5 V to 24 V
X
+B (SOUTH)
B OP1
BRP1
0
–B (NORTH)
B OP2
B RP2
Q1
ON
DEAD
OFF
DEAD
ON
TIME
TIME
Q2
OFF
ON
OFF
SIGNAL
OUTPUT
FIGURE 2
ZERO-CROSSING DETECTION
Dwg. WH-009-1
FIGURE 1
BIPOLAR DETECTOR
Dwg. EH-010
Figure 2 shows that there is a “dead time” approxi-
mately centered around 0 G. Thus, by sensing the HIGH
portion of the UGN3235K wired-OR output, the zero-
crossing can be detected.
Figure 3 shows that the UGN3235K makes it possible
to implement a very efficient brushless dc motor control
using a minimum number of components. Referring again
to Figure 1, the dead time (where both drivers are OFF)
allows the motor coil field to decay sufficiently. This
avoids both excessive reactive voltages and the magnetic
drag resulting from the motor coils working in opposition
to each other.
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