Fly height control for a read/write head in a hard disk drive

摘要: A fly height controller ( 10 FHC; FHC′) for controlling the of a read/write head assembly 15 ) in disk drive 20 is disclosed. heat element resistor 30 disposed within ). The includes registers 32 R, W) storing digital data words corresponding to desired levels be applied during read and write operations. are selectively coupled steady-state digital-to-analog converter (DAC) 36 ), depending upon whether or operation occurring; output DAC voltage driver 40 which turn drives current into Overdrive underdrive transistors 44 P, N) provided overdrive input transitions between An initial state register 50 receives word indicating when unselected; an 52 54 Control logic 35; 35 ′) controls may also adapted control multiple assemblies drive.