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A3940KLW Datasheet(PDF) 10 Page - Allegro MicroSystems |
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A3940KLW Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 12 page 3940 FULL-BRIDGE POWER MOSFET CONTROLLER 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 10 Functional Description (cont’d) Control Logic PHASE ENABLE MODE SR GLA GLB GHA GHB SA SB Mode of Operation 0 1 X X 1 0 0 1 Lo Hi Reverse 0 0 0 1 0 1 1 0 Hi Lo Fast decay, SR enabled 0 0 1 1 1 1 0 0 Lo Lo Slow decay, braking mode 0 0 0 0 0 0 0 0 Z Z Fast decay, coast 0 0 1 0 1 0 0 0 Lo Z Slow decay, SR disabled 1 1 X X 0 1 1 0 Hi Lo Forward 1 0 0 1 1 0 0 1 Lo Hi Fast decay, SR enabled 1 0 1 1 1 1 0 0 Lo Lo Slow decay, braking mode 1 0 0 0 0 0 0 0 Z Z Fast decay, coast 1 0 1 0 0 1 0 0 Z Lo Slow decay, SR disabled NOTES: All faults will coast the motor, i.e., GHA = GHB = GLA = GLB = 0 to switch off all bridge MOSFETs. X = Indicates a “don’t care”. Z = Indicates a high-impedance state. Fault Responses Fault Mode RESET FAULT CP Reg. VREG13 VREG5 GHx GLx No Fault 1 0 ON ON ON – – Short-to-Battery"# 1 1 ON ON ON 0 0 Short-to-Ground"$ 1 1 ON ON ON 0 0 Open Bridge (V DRAIN)"% 1 1 ON ON ON 0 0 V REG13 Undervoltage 1 1 ON ON& ON 0' 0' V BB Overvoltage 1 1 ON ON ON 0 0 V BB Undervoltage 1 1 OFF OFF ON& 0' 0' Thermal Shutdown 1 1 OFF OFF ON& 0' 0' Sleep 0 1 OFF OFF OFF Z Z NOTES: " = These faults are latched but will clear during RESET = 0 pulse. GHx = GLx = 0 during RESET = 0, except see '. Other faults will not clear except when their cause is removed. # = Short-to-battery can only be detected when the corresponding GLx = 1. $ = Short-to-ground can only be detected when the corresponding GHx = 1. % = Bridge fault appears as a short-to-ground fault on all motor phases. & = Not instructed off but may be low voltage because of the fault indicated. ' = During undervoltage conditions, the low sides of GHx and GLx are instructed to be “on” so that the outputs are low = 0; however, with V REG13 < 4 V, the outputs will start to open (become high impedance). See “Sleep Mode”. |
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