Datasheet A3955 (Allegro) - 6

A3955 Full-Bridge PWM Microstepping Motor Driver ELECTRICAL CHARACTERISTICS (continued) at TA = 25°C, VBB = 5 V to 50 V, VCC = 4.5 V to 5.5 V (unless otherwise noted. ) Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Control Circuitry (cont’d)
Thermal Shutdown Temp. TJ — 165 — °C Thermal Shutdown Hysteresis ∆TJ — 15 — °C
AC Timing
PWM RC Fixed Off-time tOFF RC CT = 470 pF, RT= 43 kΩ 18.2 20.2 22.3 μs PWM Turn-Off Time tPWM(OFF) Current-Sense Comparator Trip — 1.0 1.5 μs to Source OFF, IOUT = 100 mA Current-Sense Comparator Trip — 1.4 2.5 μs to Source OFF, IOUT = 1.5 A PWM Turn-On Time tPWM(ON) IRC Charge ON to Source ON, — 0.4 0.7 μs IOUT = 100 mA IRC Charge ON to Source ON, — 0.55 0.85 μs IOUT = 1.5 A PWM Minimum On Time tON(min) VCC = 5.0 V, RT ≥ 43 kΩ, CT = 470 pF 1.0 1.6 2.2 μs IOUT = 100 mA Crossover Dead Time tCODT 1 kΩ Load to 25 V 0.3 1.5 3.0 μs Allegro MicroSystems, Inc. 5 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com