3935 datasheet(11/16 Pages) ALLEGRO

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3935

THREE-PHASE POWER

MOSFET CONTROLLER

www.allegromicro.com

Functional Description (cont’d)

Input Logic

ENABLE xLO

xHI

GLx

GHx

Mode of Operation

All gate drive outputs low

0000

Both gate drive outputs low

0101

High side on

1010

Low side on

1100

XOR circuitry prevents shoot-through

Fault Responses

ENABLE

Boost

REG

Fault Mode

Input

FAULT

OVFLT

UVFLT

Reg.

GHx

GLx

No Fault

Short-to-Battery

Short-to-Ground

Bridge (V

DRAIN) Fault

REG Undervoltage

BAT Overvoltage

OFF&

BAT Undervoltage'

OFF

DD Undervoltage'

OFF

Thermal Shutdown'

OFF

NOTES: x = “Little x ”indicates A, B, or C phase.

X = “Capital X “ indicates a “don’t care”.

Z = High-impedance state.

" = Depends on xLO input, xHI input, and ENABLE. See Input Logic table.

# = Short-to-battery can only be detected when the corresponding GLx = 1. This fault is not detected when ENABLE = 0.

$ = Short-to-ground can only be detected when the corresponding GHx = 1. This fault is not detected when ENABLE = 0.

% = Bridge fault appears as a short-to-ground fault on all motor phases. This fault is not detected when ENABLE = 0.

& = Off, only because V

BOOST ≈ VBAT is above the voltage threshold of the regulator’s voltage control loop.

' = These faults are not only reported but action is taken by the internal logic to protect the A3935 and the system.

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