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°C 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°C (D suffix).
●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
