ATC
Single Phase Hall Effect Latch
Features
- On-chip Hall sensor
- Bi-direction H type output drivers for single coil
- Internal bandgap regulator allows temperature
compensated operations and a wide operating
voltage range
- High output sinking capability up to 250mA
- Operating voltage: 3.5V~20V
- Low output switching current noise
- Build-in shunt Zener protection for output driver
- SOP-7L provide FG output pin
- Package: SIP-4L and SOP-7L
ATS477
General Description
ATS477 that integrates Hall sensor with output
drivers is designed for electrical commutation of
brush-less DC motor application. The device
includes on-chip Hall voltage generator for
magnetic sensing, the error amplifier that amplifies
the Hall voltage, a comparator that is to provide
switching hysteresis for noise rejection, the
bi-direction drivers for sinking and driving large
current load, and the frequency generator (FG) that
provides a signal proportional to rotation speed.
Internal bandgap regulator is used to provide
temperature compensated bias for internal circuits
and allows a wide operating supply voltage range.
Built-in protection circuit and output shunt Zener
diodes were applied for protecting output drivers
during operating.
If a magnetic flux density is larger than threshold
Bop, DO is turned to sink and DOB is turned to
drive. The output state is held until a magnetic flux
density reversal falls below Brp causing DO to be
turned to drive and DOB turned to sink.
ATS477 is rated for operation over-temperature
range from -20
o
C to 85
o
C and voltage range from
3.5V to 20V. The devices are available in low cost
die forms or rugged SIP-4L and power SOP-7L
packages.
Applications
- Single-coil Brush-less DC Fan
- Single-coil Brush-less DC Motor
Ordering Information
ATS477 X - X X X - X
Wafer Body
Blank or
A~Z : if necessary
to specify
Package
P: SIP-4L
S: SOP-7L
Lead
L : Lead Free
Blank: Normal
Packing
Blank : Tube or Bulk
A : Tape & Reel
Magnetic
Characteristics
A or B
Application Circuit
FG
1
2
3
4
1
2
7
6
coil
coil
3
Vcc
4
5
Vcc
(SIP-4L)
Single-coil brush-less DC Fan
(SOP 7)
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. A5 Apr 15, 2004
1/7
ATC
Single Phase Hall Effect Latch
Absolute Maximum Ratings
Characteristics
Supply voltage
Magnetic flux density
Output “on” current
Operating temperature range
Storage temperature range
Continuous
Hold
Peak (Start Up)
( at Ta=25
o
C )
Symbol
V
CC
Values
20
Unlimited
250
300
600
-20~+85
-65~+150
550
800
mA
°C
°C
mW
mW (Note 1)
Unit
V
ATS477
B
Ic
T
a
T
s
SIP-4L
Package Power
PD
Dissipation
SOP-7L
(Note 1) Ground pin must connect to large area copper on PCB as possible.
Electrical Characteristics
Characteristic
Supply Voltage
Symbol
( Ta=+25°C, Vcc=3.5V to 20V )
Test Conditions
Min
Typ
－
500
－
0.3
18
1.0
0.3
1.0
Max
20
800
Vcc
0.7
30
5.0
1.5
5.0
Unit
V
mV
V
V
mA
µs
µs
µs
－
Vcc
3.5
－
Vcc=14V, Ic=200mA
Output
Saturation Vce(sink)
Voltage
Vce(drive)
Vcc=14V, Ic=200mA
Vcc-1.5
FG Saturation Voltage
Vce
Vcc=14V, I
FG
=20mA
－
Supply Current
Icc
Vcc=20V, Output Open
－
Output Rise Time
tr
Vcc=14V, RL=820Ω, CL=20pF
－
Output Falling Time
tf
Vcc=14V, RL=820Ω, CL=20pF
－
Switch Time Differential
∆t
Vcc=14V, RL=820Ω, CL=20pF
Magnetic Characteristics
(Ta=+25°C)
(1mT=10Gauss)
A grade
Characteristic
Operate Point
Release Point
Hysteresis
B grade
Characteristic
Operate Point
Release Point
Hysteresis
Symbol
Bop
Brp
Bhy
Symbol
Bop
Brp
Bhy
Min.
5
-70
-
Min.
-
-100
-
Typ.
-
-
60
Typ.
-
-
60
Max.
70
-5
-
Max.
100
-
-
Unit
Gauss
Gauss
Gauss
Unit
Gauss
Gauss
Gauss
Anachip Corp.
www.anachip.com.tw
4/7
Rev. A5 Apr 15, 2004
PCB Design
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