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CYD277 Series Hall Effect Switch IC |
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CYD277 series Hall-effect switch IC is a
kind of one-chip semiconductor integrated circuit, which is composed
of a reverse voltage protector, a precise voltage regulator, Hall
voltage generator, a differential amplifier, Schmitt trigger, a
temperature compensator and two open-collector output on a single
silicon chip. The main characteristics are wide operating voltage
range, high sensitivity to magnetic field, good load-carrying and
reverse protection abilities. It is the best component for brushless
fan, because its load-carrying ability is up to 400mA with
complementary output.
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FEATURES |
TYPICAL APPLICATION |
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•
Smart and Single Chip Integrated
• Temperature Compensation and Wide
Operating Temperature Range
• Good Capability of Load
• Reverse Protection
• Open Collector Complementary Outputs
• Low Price , 4 Pin Epoxy Package
• Soldering Temperature can be Lowered
Because of Alloy Tin Electroplating
• High Reliability |
•
High Sensitive Non-contact Switch
• DC Brushless Motor
• DC Brushless Fan
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MAGNETIC-ELECTRICAL
TRANSFER CHARACTERISTICS
ABSOLUTE
MAXIMUM RATINGS
|
Parameter |
Symbol |
Value |
Unit |
|
Min
|
Max |
|
Supply
Voltage |
VCC |
4.5
|
24
|
V
|
|
Magnetic Flux Density |
B
|
unlimited |
unlimited |
mT
|
|
Output
current |
Io
|
- |
400
|
mA
|
|
Operating Temperature Range |
TA
|
-20
|
85
|
°C
|
|
Storage Temperature Range |
TS |
-55
|
150
|
°C
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ELECTRICAL CHARACTERISTICS
(TA=12°C~+85°C)
|
Parameter
|
Test Conditions
|
Symbol
|
Value
|
|
|
|
|
|
min |
type |
|
Supply Voltage
|
|
VCC |
4.5
|
- |
|
Output Low Voltage
|
Vcc
= 4.5V～20V
B=20mT Io=300mA
|
VOL
|
- |
0.2
|
|
Output Leakage Current
|
Vo=Vccmax, Vcc open-collector output
|
IOH |
- |
0.1
|
|
Supply Current
|
Vcc=Vccmax, Vo open-collector output
|
ICC |
- |
17.0
|
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Output Rise time
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Vcc=12V, RL=820Ω, CL=20pF
|
tr |
- |
0.3
|
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Output Fall time
|
Vcc=12V, RL=820Ω, CL=20pF
|
tf |
- |
0.3
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Package (Unit：mm)
Magnetic Characteristics
|
Parameter |
Type |
Value |
Unit |
|
|
|
Min
|
Typ
|
Max
|
|
|
Operate Point (BOP) |
A
|
- |
- |
5
|
mT
|
|
B
|
- |
- |
8
|
|
|
C
|
- |
- |
12
|
|
Release Point (BRP) |
A
|
-5
|
- |
- |
|
B
|
-8
|
- |
- |
|
|
C
|
-12
|
- |
- |
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Hysteresis(BH) |
|
4
|
8
|
- |
Position of Sensitive Area
PIN NOTES:
1. Vcc
2. Output 1
3. Output 2
4. GND
Characteristics Curves
Temperature Characteristics of Bop, BRP
Functional Block Diagram
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NOTES: |
|
|
Voltage Regulator：
|
The
output is stable when supply voltage varies from 4.5V to
20V. |
|
Reverse Protector：
|
When
supply voltage is opposed or interfered by reverse pulse
voltage |
|
|
in
usage, It protects circuit and protective voltage is up to
30V. |
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Hall Effect Voltage
Generator
Transfers the magnetic signal to the corresponding electric
signal. |
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Differential Amplifier：
|
It can
amplify the weak voltage signal from Hall voltage generator
|
|
|
output. |
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Schmitt Trigger：
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It
transfers analogy signal from differential amplifier output
to digital |
|
|
signal.
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Temperature Compensator：
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It
ensures that the Hall-effect ICs over the temperature range
of -20°C to |
|
|
+85°C.
|
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Complementary Follower：
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Output
current can drive two windings of brushless fan directly.
Turning |
|
|
on the
brushless fan, and the output stage VOUT1 & VOUT2 will
change |
|
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when
the Hall voltage generator is forced by alternating magnetic,
the |
|
|
fan
can operate because the direction of load current( winding
of the |
|
|
fan )
is changed. |
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