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A3941 Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A3941 Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 21 page Automotive Full Bridge MOSFET Driver A3941 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Table 1. Phase Control Truth Table Inputs Outputs Bridge Mode of Operation PWMH PWML PHASE SR GHA GLA GHB GLB SA SB 1 1 1 X H L L H HS LS Bridge driven with A high and B low 1 1 0 X L H H L LS HS Bridge driven with B high and A low 0 1 X 1 L H L H LS LS Slow decay, both low-side on or low-side brake 1 0 X 1 H L H L HS HS Slow decay, both high-side on or high-side brake 0 1 1 0 L L L H Z LS Slow decay, current flow A to B, low-side diode rectification 0 1 0 0 L H L L LS Z Slow decay, current flow B to A, low-side diode rectification 1 0 1 0 H L L L HS Z Slow decay, current flow A to B, high-side diode rectification 1 0 0 0 L L H L Z HS Slow decay, current flow B to A, high-side diode rectification 0 0 X X LLLL Z Z Fast decay, diode rectification/coast X = don’t care (same for input 1 or input 0), HS = high-side FET active, LS = low-side FET active, Z = high impedance, both FETs off Table 2. PWM Options Inputsa PWM Effectb Decay Mode of Operation SR PWMH PWML PHASE 100% 0% X 1 1 PWM A to B B to A Fast Full four-quadrant control, zero average load current at 50% PWM 0 PWM PWM 1 A to B Coast Fast Fast decay, diode recirculation or coast 0 B to A 1 PWM 1 1 A to B Brake Slow High-side PWM, low-side MOSFET recirculation 0 B to A 1 1 PWM 1 A to B Brake Slow Low-side PWM, high-side MOSFET recirculation 0 B to A 0 PWM 1 1 A to B Brakec Slow High-side PWM, low-side diode recirculation 0 B to A 0 1 PWM 1 A to B Brakec Slow Low-side PWM, high-side diode recirculation 0 B to A X 0 0 X Coast Coast Fast Coast, all MOSFETs off aX indicates don’t care condition. The action is the same for input 1 or input 0. bPWM Effect indicates the effect on the load current direction or the equivalent action. cWith SR disabled, braking is only effective in one direction when sufficient forward voltage is available to allow the diode to conduct. |
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