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參數(shù)資料
| 型號(hào)： | UGN3235K |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | DUAL-OUTPUT HALL-EFFECT SWITCH |
| 中文描述： | 雙輸出霍爾效應(yīng)開關(guān) |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 73K |
| 代理商： | UGN3235K |
3235
DUAL-OUTPUT
HALL-EFFECT SWITCH
TRANSFER CHARACTERISTICS
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.
APPLICATIONS
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.
Dwg. WH-009-1
BOP1
BRP1
BRP2
BOP2
O
M
Q1
Q2
0
+B (SOUTH)
–B (NORTH)
ON
OFF
ON
ON
OFF
OFF
DEAD
TIME
DEAD
TIME
FIGURE 2
ZERO-CROSSING DETECTION
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.
SWITCH POINTS vs. TEMPERATURE
V
C
X
VCC
4.5 V to 24 V
Dwg. EH-010
SIGNAL
OUTPUT
2
1
4
3
2
FIGURE 1
BIPOLAR DETECTOR
0
+B
0
Dwg. GH-043A
-B
VOUT(SAT)
25 V
MAX
BOP1
BRP1
VOUT(OFF)
BOP2
BRP2
O
MAGNETIC FLUX
0
50
100
AMBIENT TEMPERATURE IN
°
C
-50
Dwg. GH-027-1
S
0
50
100
-50
-100
150
150
-150
-25
25
75
125
B
OPS
B
RPS
B
RPN
B
OPN
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