US72/73
Single Coil Fan Driver
Features and Benefits
Full Bridge Driver
High Sensitivity Hall Sensor
Locked Rotor Shutdown and Auto-Restart
Power-Efficient CMOS and Power MOSFETs
Integrated tachometer (US72) or alarm (US73) signal outputs
Applications
For 12V/24V Fans
Ordering Information
Part No.
US72
US73
Temperature Suffix
E (-40° to 85°
C
C)
E (-40° to 85°
C
C)
Package Code
DC (8-Pin narrow SOIC)
DC (8-Pin narrow SOIC)
Functional Diagram
Out1
3
Out2
6
Vdd
1
Regulator
Clamp
8
Description
The US72 and US73 provide a monolithic
solution for driving single-coil fans. The bridge
drivers provide bi-directional current through the
single phase motor winding.
US72: The tachometer/Frequency Generator
(FG) version produces a logic signal, which is
aligned with the Hall plate signal.
US73: The Rotation Detector (RD) / Alarm
Signal version has a low output in the normal
condition. When a locked rotor condition occurs
the RD changes to a high state.
P1
Hall
Amp.
P2
Gate Drive
Switching
Logic
Gate Drive
2
FG/RD
N1
Locked-Rotor
Protection
N2
Gnd
4
7
5
3901090261
Rev. 002
Page 1 of 9
Data Sheet
May/04
MELEXIS [ Melexis Microelectronic Systems ]
