FDD spindle motor driver
Motor driver ICs
FDD spindle motor driver
BA6477FS
The BA6477FS is a one-chip IC designed for driving FDD spindle motor...
Description
Motor driver ICs
FDD spindle motor driver
BA6477FS
The BA6477FS is a one-chip IC designed for driving FDD spindle motors. This high-performance IC employs a 3-phase, full-wave soft switching drive system, and contains a digital servo, an index amplifier, and a power save circuit. The compactly packaged IC reduces the number of external components required. FApplications Floppy disk drivers FFeatures 1) 3-phase, full-wave soft switching drive system. 2) Digital servo circuit. 3) Power save circuit. FAbsolute maximum ratings (Ta = 25_C)
4) Hall power supply switch. 5) Motor speed changeable. 6) Index amplifier.
FRecommended operating conditions (Ta = 25_C)
532
Motor driver ICs
FBlock diagram
BA6477FS
533
Motor driver ICs
FPin descriptions
BA6477FS
534
Motor driver ICs
FInput / output circuits (1) Index input (1, 2 pin)
BA6477FS
(2)
FG amplifier (3X5 pin)
(3)
Speed control (6 pin)
(4)
External clock input (7 pin)
535
Motor driver ICs
(5) Motor output (11X15 pin) (6) Hall bias (16 pin)
BA6477FS
(7) Hall input (17X22 pin)
(8) Integrating amplifier (28, 29 pin)
(9) Speed discriminator output (30 pin)
(10) Start / stop (31 pin)
(11) Index output (32 pin)
536
Motor driver ICs
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V)
BA6477FS
537
Motor driver ICs
FCircuit operation (1) Motor drive circuit The motor driver is based on a 3-phase, full-wave soft switching, current drive system in which the position of rotor is sensed by Hall...
Similar Datasheet