Diodes ATS177 User Manual
ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Description
ATS177 is an integrated Hall-Effect latch sensor designed for
Pin Assignments
(Top View)
electronic commutation of brush-less DC motor applications.
The device includes an on-chip Hall voltage generator for
magnetic sensing, a comparator that amplifies the Hall
voltage, and a schmitt trigger to provide switching hysteresis
for noise rejection, and open-collector output. An internal
bandgap regulator provides a temperature compensated
supply voltage for internal circuits and allows a wide operating
supply range.
When the magnetic flux density (B) is larger than operate
point (Bop), output is switched on (DO pin is pulled low). The
output state is held on until a magnetic flux density reversal
falls below Brp. When B is less than Brp, the output is
switched off.
The ATS177 is available in SIP-3L package.
Applications
• Brush-less DC Motor
• Brush-less DC Fan
• Revolution counting
• Speed measurement
SIP-3L
Features
• Bipolar Hall-Effect latch sensor
• 3.5V to 20V DC operating voltage
• Temperature compensation
• Open-collector pre-driver
• 25mA maximum output sink current
• Built-in reverse polarity protection
• Operating temperature: -40°C to +125°C
• SIP-3L package
• Green Molding Compound (No Br, Sb) (Note 1)
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
3.
DO
GND
2.
Vcc
1.
Typical Application Circuit
+12V
U1
1
OUTPUT
VCC
GND
ATS177
2
ATS177
Document number: DS31055 Rev. 6 - 2
D1
+
L1
C1
0.47uF
L2
R2
3K
Q2
NPN
+
C2
0.47uF
R1
2K
3
Q1
NPN
Brush-less DC Fan
1 of 9
www.diodes.com
July 2010
© Diodes Incorporated
)
Pin Descriptions
Pin name P/I/O Pin # Description
Vcc P 1 Positive power supply
GND P 2 Ground
DO O 3 Digital output
Functional Block Diagram
Vcc
1
ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Regulator
Hall
DO
3
plate
2
Amp
GND
2
Absolute Maximum Ratings (T
Symbol Characteristics Rating Unit
VCC Supply Voltage 20 V
V
Reverse VCC Polarity Voltage -20 V
RCC
B Magnetic Flux Density Unlimited
VCE Output OFF Voltage 30 V
PD Package Power Dissipation SIP-3L 550 mW
IC Output “ON” Current Continuous 25 mA
T
Maximum Junction Temperature 150
J(MAX
TS Storage Temperature Range -65~+150
= 25°C)
A
°C
°C
Recommended Operating Conditions
Symbol Characteristic Conditions Min Max Unit
VCC Supply Voltage Operating 3.5 20 V
TA
Notes: 2. Shall not exceed PD and Safety Operation Area.
ATS177
Document number: DS31055 Rev. 6 - 2
Operating Ambient Temperature
(Note 2)
Operating -20 85
2 of 9
www.diodes.com
°C
July 2010
© Diodes Incorporated
ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Electrical Characteristics (T
Symbol Characteristic Test Conditions Min Typ. Max Unit
VCE (sat) Output Saturation Voltage VCC = 14V, Ic = 20mA - 300 700 mV
Icex Output Leakage Current VCE = 14V, VCC = 14V -
Icc Supply Current VCC = 20V, Output Open - 5 10 mA
tr Output Rise Time VCC = 14V, RL = 820Ω, CL = 20pF - 0.3 1.5 us
tf Output Falling Time VCC = 14V, RL = 820Ω, CL = 20pF - 0.3 1.5 us
= 25°C)
A
<0.1
10 uA
Test Circuit
14V
DO
RL
RL=820 Ohm
CL=20 pF
CL
Test Circuit
ATS177
Document number: DS31055 Rev. 6 - 2
3 of 9
www.diodes.com
July 2010
© Diodes Incorporated
Loading...