The fixed-frequency pulse duration is set by a user-selected external RC timing network. The capacitor in the RC timing network also determines a user-selectable blanking window that prevents false triggering of the PWM current-control circuitry during switching transitions.
To reduce on-chip power dissipation, the full-bridge power outputs have been optimized for low saturation voltages. The sink drivers feature the Allegro® patented Satlington® output structure. The Satlington outputs combine the low voltage drop of a saturated transistor and the high peak current capability of a Darlington.
For each bridge, the INPUTA and INPUTB terminals determine the load-current polarity by enabling the appropriate source and sink driver pair. When a logic low is applied to both INPUTs of a bridge, the braking function is enabled. In brake mode, both source drivers are turned off and both sink drivers are turned on, thereby dynamically braking the motor. When a logic high is applied to both INPUTs of a bridge, all output drivers are disabled.
Special power-up sequencing is not required. Internal circuit protection includes thermal shutdown with hysteresis, ground-clamp and flyback diodes, and crossover-current protection.
The A3968 is supplied in a 16-lead plastic SOIC with two pins internally fused to the die pad for enhanced thermal dissipation. These pins are at ground potential and need no electrical isolation. The device is lead (Pb) free, with 100% matte tin leadframe plating.
经销产品:Allegro、AKE、Honeywell、Sanken、Melexis、ST、TOSHIBA各大品牌的霍尔开关(如单极开关型、双极开关型、双极锁存型、线性型、方向检测型、齿轮传感型、微功耗超灵敏型等)霍尔传感器、霍尔电流传感器、电机驱动芯片(有直流电机驱动IC:、步进电机驱动IC:、直流无刷电机驱动IC等)
更多详情请登录
深圳市泰通达电子
销售热线:33062283 33062282 23816131 23816624
商务QQ:1142075671