FS177

Technology

Low Voltage Hall Effect Latch

Rev0.7 Apr. 25, 2012(LF)

FS177 Data Sheet

Page 1 / 10

General Description

The FS177 is an integrated Hall effect latched sensor designed for electronic commutation of

brush-less DC motor applications. The device includes an on-chip Hall voltage generator for

magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to provide

switching hysteresis for noise rejection, and open-collector output. An internal bandgap regulator

is used to provide temperature compensated supply voltage for internal circuits and allows a wide

operating supply range.

A north pole of sufficient strength will turn the output ON. In the absence of a magnetic field, the

output is OFF.

Features



Wide operating voltage range: 3.0V to 20V



Maximum output sink current 25mA



Open-Collector pre-driver



Reverse polarity protection



Package : TO-92SP-3

Typical Application Circuit

TO-92SP-3

+12V

FS177

Gnd

Vcc

Output

1

2

3

R1

L1

L2

R2

C1

C2

Brushless DC Fan