US5781LSE Melexis Inc, US5781LSE Datasheet - Page 39

• Manufacturer Part Number: US5781LSE
• Description: IC HALL EFFECT SWITCH TSOT-23
• Manufacturer: Melexis Inc
• Type: Unipolar Switchr

Specifications of US5781LSE

• Sensing Range: 15mT Trip, 3.5mT Release
• Voltage - Supply: 3.5 V ~ 24 V
• Current - Supply: 5mA
• Current - Output (max): 50mA
• Output Type: Digital, Open Drain
• Operating Temperature: -40°C ~ 150°C
• Package / Case: SOT-23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: US5781LSETR

Brushless DC Motor Sensors
The use of Hall Effect Sensors in DC motors eliminates the friction, electrical noise and power loss asso-
ciated with other types of mechanical commutation, such as brushes. Hall ICs provide a long mainte-
nance-free life and offer greater flexibility with respect to direst interface with digital commands.
Figure 26, Brushless DC Motor Sensor
Figure 26, Brushless DC Motor Controller
The US8881 is a brushless DC motor driver that was designed to meet the needs of high volume, low
cost motors which do not require the expensive options needed for servo or other closed loop applica-
tions. The US8881 works with 3 HallIC latches, and provides all motor control via 6 external N-chan-
nel FETs. A complete datasheet for this device is in section 4 of this book.
Figure 26, Brushless DC
Motor Controller
Section 3 - Applications
Counter Reset
Forward/Reverse
Thermal Switch
15V
V+ = 40 V
0.1
F
Brake
1 0 0 0
1 0 0 0
C
R
F
F
OSC
OSC
2 0
F
0.1
F
0.005 f
F
10K
0.1
F
Speed Adjust
3-24
S
500
10
11
12
1
2
3
4
5
6
7
8
9
Supply Voltage
V
Hall "A" Input
Hall "B" Input
Hall "C" Input
FWD/REV Input
Speed Adjust Input
Oscillator Control
(+)Current Limit (Brake)
Analog Ground
(-)Current Limit (Reset)
Power Ground
REF
Out
Gate Bottom "A"
Gate Bottom "B"
Gate Bottom "C"
Cap Boost "B"
Cap Boost "C"
Cap Boost "A"
Feedback "B"
Feedback "C"
Gate Top "A"
Feedback "A"
Gate Top "B"
Gate Top "C"
24
23
22
21
20
19
18
17
16
15
14
13
2 2
2 2
2 2
2 2
2 2
+
-
2 2
+
-
+
-
1 0 f
V
V
V
1 0 f
REF
REF
1 0 f
REF
Filter
1K
1K
I
SENSE
Resistor
BLDC Motor
(3 Places)
UF4002