ATS276

Operational Gauss :
Mounting Style :
Maximum Operating Temperature :
Minimum Operating Temperature :
Maximum Output Current :
Packaging :
Operating Supply Voltage : 20 V
Output Fall Time : 1.5 uS
Operating Point Min/Max : 5 G to 70 G
Package / Case : SIP-4L
Operational Type : Complementary Output Hall Effect Latch
Current Rating : 400 mA


Features:

-  On-chip Hall sensor with two different sensitivity and hysteresis settings for ATS276/277
-  3.5V to 20V operating voltage
-  400mA (avg) output sink current  
-  Build-in protecting diode only for chip reverse power connecting
-  -20°C to 85°C operating temperature
-  Low profile 4 pin SIP package


Application

-  Dual-coil Brush-less DC Motor
-  Dual-coil Brush-less DC Fan
-  Revolution Counting
-  Speed Measurement 
 


Pinout




Specifications

Characteristics		Symbol	Values	Unit
Supply voltage		VCC	20	V
Reverse VCC Polarity Voltage		VRCC	-20	V
Magnetic flux density		B	Unlimited
Output "on" current	Continuous	Ic	0.4	A
	Hold		0.5
	Peak (Start Up)		0.7
Operating temperature range		Ta	-20~+85	°C
Storage temperature range		Ts	-65~+150	°C
Package Power Dissipation		PD	550	mW
Maximum Junction Temp		Tj	150	°C

Description

 ATS276/277 are integrated Hall sensors with output drivers, mainly designed for electronic commutation of brush-less DC Fan. This IC internally includes the regulator, protecting diode, Hall plate, amplifier, comparator, and a pair of complementary open-collector outputs (DO, DOB).

While the magnetic flux density  (B) is larger than operate point  (Bop),  DO will turn on (low), and meanwhile DOB will turn off (high). Each output is latched until  B is lower than release point  (Brp), and then DO,DOB transfer each state. For DC fan application, sometimes ATS276 need to test power reverse connection condition. Internal diode only protects chip-side  but not for coil-side. If necessary, add one external diode to block the reverse current from coil-side.