Hall Effect Latched Sensor
◼ General Description
The OCH147H is an integrated Hall effect latched sensor designed for electronic commutation of brush-less DC
motor applications. The device using HV BCD process includes an on-chip Hall voltage generator for magnetic
sensing, a comparator that amplifiers the Hall voltage, and a Schmitt trigger to provide switching hysteresis for noise
rejection, and an open-collector output. An internal band-gap regulator is used to provide temperature compensated
supply voltage for internal circuits and allows a wide operating supply range.
If a magnetic flux density larger than threshold Bop,output is turned on(low).The output state is held until a
magnetic flux density reversal falls below Brp causing OUT to be turned off(high).
⚫ Wide operating voltage range: 3.3V~26V
⚫ Operating temperature range: -40°C ~+150°C
⚫ Temperature compensation
⚫ Reverse polarity protection
⚫ Open-Drain pre-driver
⚫ Package: SOT23-3L
⚫ Rotor Position Sensing
⚫ Brush-less DC Motor
⚫ Speed measurement
⚫ Revolution counting
◼ Pin Configuration
◼ Application Circuit
IC Power Supply
It is low state during the S magnetic field
Cin RL 2.2K
Figure 1, application circuit of OCH147
Note: CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 0.1~1uF.
If the VCC power supply is clean, the CIN can be cancelled.
Ver. 1.2 Feb .27, 2018