A3930_16 Datasheet, PDF (13/21 Pages) Allegro MicroSystems – Automotive 3-Phase BLDC Controller and MOSFET Driver

A3930 and
A3931
Automotive 3-Phase BLDC Controller
and MOSFET Driver
Table 1. Fault Action Table
FF1 FF2
Fault
Action*
ESF = 0
ESF = 1
0
0 Undervoltage
Disable
Disable
0
0 Overtemperature
No Action No Action
0
0 Logic Fault
Disable
Disable
1
0 Short to ground
No Action
Disable
1
0 Short to supply
No Action
Disable
1
0 Shorted motor winding No Action
Disable
0
1 Low load current
No Action No Action
1
1 None
No Action No Action
*Disable indicates that all gate outputs are low and all MOSFETs are
turned off.
Table 2. Commutation Truth Table*
Device H1
H2
H3
DIR
GLA
GLB
Both
1
0
1
1
0
0
Both
1
0
0
1
0
0
Both
1
1
0
1
1
0
Both
0
1
0
1
1
0
Both
0
1
1
1
0
1
Both
0
0
1
1
0
1
A3930
0
0
0
X
0
0
A3931
0
0
0
X
0
1
Both
1
1
1
X
0
0
Both
1
0
1
0
1
0
Both
1
0
0
0
0
1
Both
1
1
0
0
0
1
Both
0
1
0
0
0
0
Both
0
1
1
0
0
0
Both
0
0
1
0
1
0
*X indicates “don’t care,” Z indicates high impedance state
GLC
1
1
0
0
0
0
0
1
0
0
0
0
1
1
0
GHA
1
0
0
0
0
1
0
1
0
0
0
1
1
0
0
GHB
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
GHC
0
0
0
1
1
0
0
0
0
1
1
0
0
0
0
SA
High
Z
Low
Low
Z
High
Z
High
Z
Low
Z
High
High
Z
Low
SB
Z
High
High
Z
Low
Low
Z
Low
Z
Z
Low
Low
Z
High
High
SC
Low
Low
Z
High
High
Z
Z
Low
Z
High
High
Z
Low
Low
Z
Table 3. INPUT LOGIC
MODE
PWM BRAKE
0
0
1
0
1
1
1
0
1
1
1
1
X
X
0
X
X
X
X
X
X
*X indicates “don’t care”
COAST
1
1
1
1
1
0
X
RESET
1
1
1
1
1
1
0
Decay
Fast
Fast
Slow
Slow
n/a
X
X
Mode of Operation
PWM chop – current decay with opposite of selected drivers ON
Peak current limit – selected drivers ON
PWM chop – current decay with both low-side drivers ON
Peak current limit – selected drivers ON
Brake mode - All low-side gates ON
Coast mode - All gates OFF
Sleep mode – All gates OFF, low power state, 5 V OFF
Allegro MicroSystems, LLC
13
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com