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PDF AH277A Data sheet ( Hoja de datos )
| Número de pieza | AH277A | |
| Descripción | COMPLEMENTARY OUTPUT HALL EFFECT LATCH | |
| Fabricantes | BCD Semiconductor | |
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COMPLEMENTARY OUTPUT HALL EFFECT LATCH
General Description
Features
Data Sheet
AH277A
The AH277A is an integrated Hall sensor with output
driver designed for electronic commutation of brush-
less DC motor applications. The device includes an on-
chip Hall sensor for magnetic sensing, an amplifier
that amplifies the Hall voltage, a Schmitt trigger to
provide switching hysteresis for noise rejection, a tem-
perature compensation circuit to compensate the tem-
perature drift of Hall sensitivity and two
complementary open-collector drivers for sinking
large load current. It also includes an internal band-gap
regulator which is used to provide bias voltage for
internal circuits.
Placing the device in a variable magnetic field, if the
magnetic flux density is larger than threshold BOP, the
pin DO will be turned low (on) and pin DOB will be
turned high (off). This output state is held until the
magnetic flux density reverses and falls below BRP,
then causes DO to be turned high (off) and DOB
turned low (on).
· On-Chip Hall Sensor
· 3.5V to 16V Supply Voltage
· 400mA (avg) Output Sink Current
· Reversed Supply Voltage Protection
· -20oC to 85oC Operating Temperature
· Low Profile TO-94 (SIP-4L) Package
· ESD Rating: 300V (Machine Model)
Applications
· Dual-Coil Brushless DC Motor
· Dual-Coil Brushless DC Fan
· Revolution Counting
· Speed Measurement
AH277A is available in TO-94 (SIP-4L) package.
Oct. 2009 Rev. 1. 6
TO-94
Figure 1. Package Type of AH277A
BCD Semiconductor Manufacturing Limited
1
1 page  
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Electrical Characteristics
(TA=25oC, VCC=14V, unless otherwise specified)
Parameter
Symbol
Test Condition
Output Saturation Voltage
Output Leakage Current
Supply Current
Output Rise Time
Output Fall Time
Switch Time Differential
Output Zener Breakdown Voltage
VSAT
IOL
ICC
tr
tf
∆t
VZ
VCC=3.5V, IO=100mA
IO=400mA
VCE=16V
VCC=16V, Output Open
RL=820Ω, CL=20pF
RL=820Ω, CL=20pF
RL=820Ω, CL=20pF
Magnetic Characteristics
(TA=25oC)
Parameter
Symbol
Grade
Min
Operating Point
A
BOP B
10
5
C
Releasing Point
A -50
BRP B -70
C -100
Hysteresis
BHYS
Min
Typ
30
-30
60
VDO (V)
Data Sheet
AH277A
Typ Max Unit
0.4 V
0.35 0.6
0.1 10
V
µA
12 16 mA
3.0 10
µs
0.3 1.5
µs
3.0 10
µs
55 V
Max Unit
50 Gauss
70 Gauss
100 Gauss
-10 Gauss
-5 Gauss
Gauss
Gauss
Off-state
High
Turn off
BHYS
Turn on
VSAT
N
Oct. 2009 Rev. 1. 6
Low
On-state
BRP 0 BOP
Magnetic Flux Density (Gauss)
S
BCD Semiconductor Manufacturing Limited
5
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