Data Sheet
SINGLE PHASE HALL EFFECT LATCH
General Description
The AH477A is an integrated Hall sensor with H-
bridged output driver designed for brushless DC motor
applications. The device includes an on-chip Hall sen-
sor for magnetic sensing, an amplifier that amplifies
the Hall voltage, a comparator to provide switching
hysteresis for noise rejection, a bi-directional drivers
for sinking and driving large current load. It also
includes an internal bandgap regulator to provide tem-
perature compensated bias for internal circuits and
allows a wide operating supply voltage range.
Placing the device in a variable magnetic field, if the
magnetic flux density is larger than threshold B
OP
, the
DO is turned to sink and DOB is turned to drive. This
output state is held until the magnetic flux density
reverses and falls below B
RP,
then causes DO to be
turned to drive and DOB turned to sink.
The AH477A is available in TO-94 (SIP-4L) package.
AH477A
Features
·
·
·
·
·
·
·
·
·
On-Chip Hall Sensor
Operating Voltage: 3.5V to 18V
H-Bridge Output Drivers for Single Coil
Internal Bandgap Regulator for Temperature
Compensation
Low Output Switching Current Noise
Operating Temperature: -20
o
C to 85
o
C
Low Profile TO-94 (SIP-4L) Package
ESD Rating: 6000V (Human Body Model)
Suitable for PWM Power Supply Control Speed
Applications
·
·
Single-coil Brushless DC Motor
Single-coil Brushless DC Fan
TO-94
Figure 1. Package Type of AH477A
Oct. 2009 Rev. 1. 2
1
BCD Semiconductor Manufacturing Limited
Data Sheet
SINGLE PHASE HALL EFFECT LATCH
Functional Block Diagram
V
CC
1
Regulator
2
DO
V
CC
AH477A
Hall
Sensor
Amplifier
Schmitt
Trigger
Pre-
Driver
V
CC
3
4
GND
DOB
Figure 3. Functional Block Diagram of AH477A
Ordering Information
AH477A
Circuit Type
Package
Z4: TO-94 (SIP-4L)
-
G1: Green
Magnetic Characteristics
A: 5 to 70 Gauss
B: 100 Gauss
Part Number
AH477AZ4-AG1
AH477AZ4-BG1
Marking ID
477AZ4-G1
477AZ4-G1
Packing Type
Bulk
Bulk
Package
TO-94
Temperature Range
-20 to 85
o
C
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
Oct. 2009 Rev. 1. 2
3
BCD Semiconductor Manufacturing Limited
Data Sheet
SINGLE PHASE HALL EFFECT LATCH
Absolute Maximum Ratings (Note 1)
(T
A
=25
o
C)
Parameter
Supply Voltage
Magnetic Flux Density
Continuous
Output Current
Hold
Peak (start up)
Power Dissipation
Die to atmosphere
Thermal Resistance
Die to package case
Storage Temperature
ESD (Machine Model)
ESD (Human Body Model)
P
D
θ
JA
θ
JC
T
STG
I
O
Symbol
V
CC
B
Value
20
Unlimited
250
300
600
550
227
49
-50 to 150
600
6000
Unit
V
Gauss
mA
mA
mA
mW
o
C/W
o
AH477A
C/W
o
C
V
V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated
under "Recommended Operating Conditions" is not implied. "Absolute Maximum Ratings" for extended period may affect
device reliability.
Recommended Operating Conditions
(T
A
=25
o
C)
Parameter
Supply Voltage
Frequency (PWM Power)
Ambient Temperature
Symbol
V
CC
f
T
A
Min
3.5
0.1
-20
Max
18
25
85
Unit
V
kHz
o
C
Oct. 2009 Rev. 1. 2
4
BCD Semiconductor Manufacturing Limited
Data Sheet
SINGLE PHASE HALL EFFECT LATCH
Electrical Characteristics
(T
A
=25
o
C, V
CC
=14V, unless otherwise specified)
Parameter
Output Saturation Voltage (Sink)
Output Saturation Voltage (Drive)
Supply Current
Output Rise Time
Output Fall Time
V
SAT
I
CC
tr
tf
Symbol
Test Condition
V
CC
=14V, I
O
=200mA
V
CC
=14V, I
O
=200mA
V
CC
=20V, Output Open
R
L
=820Ω, C
L
=20pF
R
L
=820Ω, C
L
=20pF
V
CC
-
1.3
Min
Typ
0.45
V
CC
-
1.0
13.5
0.5
0.5
Max
0.65
V
CC
16
1.0
1.0
Unit
V
V
mA
µs
µs
AH477A
Magnetic Characteristics
(T
A
=25
o
C)
Parameter
Operating Point
Releasing Point
Hysteresis
Symbol
B
OP
B
RP
B
HYS
Grade
A
B
A
B
-70
-100
70
Min
5
Typ
Max
70
100
-5
Unit
Gauss
Gauss
Gauss
Test Circuit
AH477A
S
Marking Side
V
CC
V
CC
DO DOB GND
1
2
3
4
C1
0.1µF
820Ω
N
Oct. 2009 Rev. 1. 2
5
BCD Semiconductor Manufacturing Limited
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