US72

www.DataSheet4U.com 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° C to 85° C) E (-40° C to 85° 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 US72/73 Single Coil Fan Driver TABLE OF CONTENTS FEATURES AND BENEFITS ................................................................................................................ 1 APPLICATIONS .................................................................................................................................... 1 ORDERING INFORMATIO...