A3936SEDTR

A3936 DMOS Three-Phase PWM Motor Driver Features and Benefits Description ▪ ±3 A, 50 V continuous output rating ▪ Low rDS(on) outputs (typically 500 mΩ source, 315 mΩ sink) ▪ Configurable mixed-, fast- and slow-current-decay modes ▪ Synchronous rectification for low power dissipation ▪ Internal UVLO and thermal shutdown circuitry ▪ Crossover-current protection ▪ Tachometer output for external speed control loop Designed for pulse-width-modulated (PWM) current control of three-phase brushless DC motors, the A3936 is capable of peak output currents to ±3 A and operating voltages to 50 V. Internal fixed off-time PWM current-control timing circuitry can be configured to operate in slow-, fast- and mixed-decay modes. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, and crossover current protection. Special power-up sequencing is not required. Package: 44-pin PLCC (suffix ED) The A3936 is supplied in a 44-pin plastic PLCC with internally fused leads (three on each side) for enhanced heat dissipation. These leads are at ground potential and need no electrical isolation. This device is lead (Pb) free version, with 100% matte tin leadframe plating. Not to scale Typical Application VREG CP1 OSC Regulator VDD TACH HBIAS SLEEP DIR EXT MODE BRAKE SR Osc TSD UVLO [VDD VREG VCP] Charge Pump 3X Half Bridge VBB1 OUTA OUTB M OUTC Control Logic and Gate Drive Fixed Off-Time PWM Current Ctrl. Blanking Time Crossover Current Protection BLANK Fast, Slow, and Mixed Decay PFD1 Sync. Rect. LSS1 Zero Current Detect Current Sense GND LSS2 SENSE HA– HB– HC– HA+ HB+ HC+ PFD2 4X GND VCP VBB2 ENABLE A3936-DS, Rev. 8 CP2 GND VDD A3936 DMOS Three-Phase PWM Motor Driver Selection Guide Part Number Packing Package A3936SEDTR-T* 450 pieces per reel 44-pin PLCC with internally fused leads *Variant is in production but has been determined to be LAST TIME BUY. This classification indicates that the variant is obsolete and notice has been given. Sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Status date change November 2, 2009. Deadline for receipt of LAST TIME BUY orders is April 30, 2010. Absolute Maximum Ratings Rating Units Load Supply Voltage Characteristic VBB 50 V Logic Supply Voltage VDD 7.0 V VIN tw > 30 ns –0.3 to VDD + 0.3 V Logic Input Votage Range tw < 30 ns –1.0 to VDD + 1 V 0.5 V VDD V ±3 A Sense Voltage Reference Voltage Output Current Symbol Notes VSENSE VREF IOUT Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a junction temperature of 150°C. Operating Ambient Temperature TA –20 to 85 ºC Maximum Junction Temperature TJ(max) 150 ºC Tstg –55 to 150 ºC Storage Temperature Range S Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 A3936 DMOS Three-Phase PWM Motor Driver TACH B ANDG AP HBIAS VREG HA+ HA- HALL CP1 CP2 R E G U LA T O R C HAR G E P UMP VCP .22uf/50V VDD .22uf/100V VREG .22uf/50V Functional Block Diagram OVERVOLTAGE UNDERVOLTAGE AND FAULT DETECT VBB1 VCP VBB2 Comm Log ic HB+ HB- HALL OUTA HC+ Control Log ic HC- HALL GATE DRIVE OUTB SLEEP OUTC DIR EXTMODE LSS2 BRAKE LSS1 SR SENSE - ZERO CURRENT DETECT RS + GND .1uF ENABLE VDD OSC - PFD1 PWM TIMER CURRENT SENSE + BLANK BUFFER/ DIVIDER REF PFD2 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 A3936 DMOS Three-Phase PWM Motor Driver ELECTRICAL CHARACTERISTICS at TJ = +25°C, VBB = 50 V, VDD = 5.0 V, fPWM < 50KHz (unless noted otherwise) Limits Characteristics Sym bol Test Conditions M in. Typ. M ax. Units Operating 9 – 50 V During Sleep Mode 0 50 V VOUT = VBB –