FEATURES
Hall-Effect Commutation
60 or 120 Sensor Spacing
Integral High-Side Drive for all N-Channel MOSFET
Bridges
PWM Input
Quadrature Selection
Tachometer Output
Reversible
Braking
Output Enable Control
Cross Conduction Protection
Current Limiting
Undervoltage Lockout
Internal Pull-Up Resistors
DESCRIPTION
The Si9979 is a monolithic brushless dc motor controller with
integral high-side drive circuitry. The Si9979 is configured to
allow either 60 or 120 commutation sensor spacing. The
internal low-voltage regulator allows operation over a wide
input voltage range, 20- to 40-V dc.
The Si9979 provides commutation from Hall-effect sensors.
The integral high-side drive, which utilizes combination
bootstrap/charge pump supplies, allows implementation of an
all n-channel MOSFET 3-phase bridge. PWM, direction,
quadrature select, and braking inputs are included for control
along with a tachometer output. Protection features include
cross conduction protection, current limiting, and undervoltage
lockout. The FAULT output indicates when undervoltage, over
current, disable, or invalid sensor shutdown has occurred.
The Si9979 is available in both standard and lead (Pb)-free
48-pin SQFP packages and is specified to operate over the
commercial temperature range of 0 to 70 C (C suffix), and the
industrial temperature range of −40 to 85 ℃ (D suffix).