ATS177_10 Datasheet, PDF (1/9 Pages) Diodes Incorporated – SINGLE OUTPUT HALL EFFECT LATCH

ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Description
Pin Assignments
ATS177 is an integrated Hall-Effect latch sensor designed for
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.
(Top View)
SIP-3L
Applications
• Brush-less DC Motor
• Brush-less DC Fan
• Revolution counting
• Speed measurement
3. DO
2. GND
1. Vcc
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.
Typical Application Circuit
+12V
D1
R1
2K
U1
1 _{VCC OUTPUT} 3
GND
2 ^ATS177
L1
Q1
NPN
R2
3K
+ _C1
0.47uF
L2
Q2
NPN
+ C2
0.47uF
ATS177
Document number: DS31055 Rev. 6 - 2
Brush-less DC Fan
1 of 9
www.diodes.com
July 2010
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