Diodes ATS177 - Manual

ATS177
SINGLE OUTPUT HALL EFFECT LATCH
ATS177
Document number: DS31055 Rev. 6 - 2
1 of 9
www.diodes.com
July 2010
© Diodes Incorporated
Description
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.
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)
Pin Assignments
(Top View)
1. Vcc
2. GND
3. DO
SIP-3L
Applications
• Brush-less
DC Motor
• Brush-less DC Fan
• Revolution counting
• Speed
measurement
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
U1
ATS177
VCC
1
GND
2
OUTPUT
3 Q1
NPN Q2
NPN
R1
2K
R2
3K
D1
+ C1
0.47uF + C2
0.47uF
L1
L2
Brush-less DC Fan