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OCH29891
500mA Single Phase DC Fan Driver
General Description
The OCH29891 is an integrated Hall sensor with
H-Bridged output driver designed for brushless
DC motor applications. The device is using HV
process includes an one-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.
OCH29891 is available in SIP-4L package and is
rated over the -40°C to 125°C.
Features
One-chip Solution (Hall Element + Driver)
Continuous Output Current : 500mA
High Sensitivity Hall Sensor
BOP25GSBRP-25GS
Lock-shutdown protection & auto-restart function
Thermal Shutdown Protection
-40to +125 Temperature Range
RoHS Compliant
Available in SIP-4L(TO94) Packages
Applications
Single phase DC Brushless Fan
Single phase DC Brushless Fan
Single phase DC Brushless Motor
Pin Configuration
Pin Name
VDD
DO
DOB
GND
(Top View)
GND
DOB
DO
VDD
SIP-4L
Figure 1, Pin Assignments of OCH29891
Pin No.
Pin Function
1 Positive Power Supply
2 Output 1
3 Output 2
4 Ground
Typical Application Circuit
OCH29891
OCH29891
VCC
VCC
12 3 4
D1
DIODE
12 3 4
D2
DIODE
R1
5.1Ω
C1
4.7uF
Coil
C2
Coil
4.7~22uF
Figure 2, Typical Application Circuit of OCH29891
Note1: When the power pulse is relatively largeMust use least C1=4.7µF(ceramic capacitor) capacitor &
R1=5.1Ω or C2=4.7~22uF for the decoupling between VDD and GND and place the capacitor as close to the IC
as possible.
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Ver. 1.0, Nev.15, 2017
源于灿瑞 磁传天下

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OCH29891
500mA Single Phase DC Fan Driver
Ordering Information
Part Number Package Type
Packing Qty
BOP (Gauss) BRP(Gauss) Temperature Eco Plan Lead
OCH29891ME SIP-4L
1000pcs/Bag 25(Typ.)
-25(Typ.) -40 ~ 125ROHS Cu
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Page2 - 2
Ver. 1.0, Nev.15, 2017
源于灿瑞 磁传天下