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PDF AH478 Data sheet ( Hoja de datos )
| Número de pieza | AH478 | |
| Descripción | SINGLE PHASE HALL EFFECT LATCH | |
| Fabricantes | BCD Semiconductor | |
| Logotipo |  |
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Data Sheet
SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478
General Description
Features
The AH478 is a single coil Hall sensor with output
drivers designed for brush-less DC motor application.
This IC consists of one H-bridge driver for motor's coil
driving and has automatic lock shutdown and restart
function relatively. To avoid coil burning, rotor lock
shutdown detection circuit shut down the output driver
if the rotor is blocked and then the automatic recovery
circuit will try to restart the motor. This function
repeats while rotor is blocked. Until the blocking is
removed, the motor recovers running normally.
If a magnetic flux density is larger than threshold BOP,
the DO is turned to sink and DOB is turned to drive.
This 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.
This IC is available in TO-95 package.
· On-chip Hall Sensor
· Rotor-locked Shutdown
· Automatically Restart
· Operating Voltage: 3.5 to 18V
· High Output Sourcing/Sinking Capability up to
300mA
· Bi-direction H-type Output Drivers for Single
Coil
· Internal Bandgap Regulator for Temperature
Compensation
· Low Output Switching Current Noise
· Operating Temperature: -20 to 85oC
· Low Profile TO-95 Package
· ESD Rating: 3000V (Human Body Model)
Applications
· Single Coil Brushless DC Motor
· Single Coil Brushless DC Fan
Nov. 2008 Rev. 1. 2
www.DataSheet4U.net
TO-95
Figure 1. Package Type of AH478
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478
Electrical Characteristics
(TA=25oC, VCC=14V, unless otherwise specified)
Parameter
Symbol
Test Condition
Output Saturation Voltage (Sink)
Output Saturation Voltage (Drive)
VSAT
IOUT=150mA
IOUT=150mA
Supply Current
Output ON Time
Output OFF Time
Charge Current
Discharge Current
Duty Ratio
Clamp Voltage
Comparator Voltage
Thermal Resistance (Junction to Case)
ICC
TON
TOFF
ICHG
IDHG
DR
VCL
VCP
θJC
VCC=20V, output open
RL=820Ω, CCT=0.47µF
RL=820Ω, CCT=0.47µF
VCT=1 to 2.5V
VCT=3.5 to 2.5V
TOFF/TON
Limiting Voltage
Limiting Voltage
TO-95
Min Typ Max Unit
0.2 0.25
V
VCC-
1.0
VCC-
0.8
14
VCC
16
V
mA
135 ms
1s
3.5 µA
0.5 µA
5 7 10
2.8 V
1.8 V
45 oC/W
Magnetic Characteristics
(TA=25oC)
Parameter
Symbol
Grade
Min
Typ
Max Unit
Operating Point
A
BOP
B
5
70
Gauss
100
Releasing Point
A -70
BRP
B -100
-5
Gauss
Hysteresis
BHYS
70 Gauss
Test Circuit
S
Marking Side
N
Power
Input
C1
10 µF
AH478
(Front View)
CT VCC DO DOB GND
1 2 3 45
CCT
2.2µ F
RL
820Ω
Nov. 2008 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
5
5 Page 
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
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