Press Release Summary:
Full-bridge, pre-driver Model A3940, suited for large, brush, DC motors, provides 4 gate-drive outputs capable of driving various N-Channel MOSFETs. Bootstrap capacitors provide above-battery supply voltage required for N-Channel FETs, while internal charge pump for high side allows for DC, 100% duty cycle, operation of bridge. PHASE and ENABLE input terminals are provided for controlling speed and direction of DC motor with externally applied PWM control signals.
Original Press Release:
Allegro Microsystems, Inc Announces Full-Bridge Pre-Driver IC Targetted at High Power Automotive and Industrial Motors
New Gate-Driver IC (A3940)
Worcester, MA - April 28, 2003 - Allegro MicroSystems, Inc. announces the release of the A3940, a new power MOSFET pre-driver IC for large brush DC motors. Targeted at the automotive and industrial markets, the A3940 provides four high-current gate-drive outputs capable of driving a wide range of power N-Channel MOSFETs. Bootstrap capacitors are utilized to provide the above-battery supply voltage required for N-Channel FETs. An internal charge pump for the high side will allow for DC (100% duty cycle) operation of the bridge. PHASE and ENABLE input terminals are provided for use in controlling the speed and direction of a DC motor with externally applied PWM control signals.
Protection features include supply undervoltage and overvoltage, programmable dead time adjustment for cross-conduction protection, thermal shutdown, and motor lead short-to-supply and short-to-ground protection.
The A3940 is manufactured using Allegro's ABCD3 (Allegro Bipolar CMOS DMOS 3rd generation) process, and is supplied in either a 28-lead TSSOP thermally enhanced package or in a standard 28-lead SOIC package.
This full-bridge pre-driver IC is targeted to meet the needs of the automotive and industrial markets. The A3940 has an eight-week lead-time and is priced at $2.46 per part for quantities of 1,000.
Allegro MicroSystems, Inc. is a supplier of advanced mixed-signal power semiconductors and Hall-effect sensors targeted toward the automotive, communications, computer/office automation, consumer and industrial markets. It maintains a leadership position in the integrated magnetic sensor and integrated motor driver product segments. With over 2,000 employees, Allegro is headquartered in Worcester, MA. Further information about Allegro can be found at www.allegromicro.com