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OCH2987
350mA Single Phase Hall-Effect DC Fan Driver
General Description
The OCH2987 is an integrated Hall sensor with
H-Bridged output driver designed for brushless
DC motor applications. The device is using HV
process includes an on-chip Hall sensor 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.
Placing the device in a variable magnetic field, if
the 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 the
magnetic flux density reverses and falls below
BRP, then causes DO to be turned to drive and
DOB turned to sink.
OCH2987 is available in SIP-4L package and is
rated over the -40°C to 125°C.
Features
One-chip Solution (Hall Element + Driver)
Input Voltage Range : 3V to 24V
Low Output Switching Current Noise
Built-in VCC To GND reverse voltage protection
Rotor Lock Protection (Lock detection, output
shutdown and automatic re-start)
High Sensitivity Hall Sensor
BOP(25GS),BRP(-25GS)
Thermal Shutdown Protection
-40to +125 Temperature Range
RoHS Compliant
Available in SIP-4L(TO94) package
Applications
Single Coil Design Cooling Fans
Single Coil DC Brushless Fan
Single Coil DC Brushless Motor
Office Automated Equipment
Brown-Goods
Home Applications
Car Audio Cooling Fan
Pin Configuration
(Top View)
GND
DOB
DO
VDD
SIP-4L
Figure 1, Pin Assignments of OCH2987
Pin Name
VDD
DO
DOB
GND
Pin No.
1
2
3
4
Pin Function
Positive Power Supply
Output 1
Output 2
Ground
Typical Application Circuit
OCH2987
OCH2987
12 3 4
12 3 4
VDD=1824V
VDD=318V
R1 Coil
4.7Ω10Ω
C1
4.7uF/50V
R1
10Ω
C1
1uF/35V
Coil
Note1: When the power pulse is relatively largeMust use least C1=4.7µF(ceremic capacitor) capacitor &
R1=4.7~10Ω for the decoupling between VDD and GND and place the capacitor as close to the IC as
Possible.
Figure 2, Typical Application Circuit of OCH2987 (SIP-4L)
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Ver. 1.3, Feb .27, 2018
源于灿瑞 磁传天下

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OCH2987
350mA Single Phase Hall-Effect DC Fan Driver
Ordering Information
Part Number
OCH2987MD
Output
Current
350mA
Package
Type
SIP-4L
Packing Qty
1000pcs
/Bag
BOP
(Gauss)
25(Typ.)
BRP
(Gauss)
Temperature
-25(Typ.) -40 ~ 125
Eco
Plan
Lead
ROHS Cu
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Page2 - 2
Ver. 1.3, Feb .27, 2018
源于灿瑞 磁传天下