Sensorless BLDC Controller
A4962
8
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Characteristics Symbol Test Conditions Min. Typ. Max. Unit
Start Duty Cycle D
ST
Default power-up value 47.5 50 52.5 %
Motor Run Parameters
Phase Advance (in electrical degrees) θ
ADV
Default power-up value 14 15 16 º
Position Control Proportional Gain K
CP
Default power-up value – 1 – –
Position Control Integral Gain K
CI
Default power-up value – 1 – –
Speed Control Proportional Gain K
SP
Default power-up value – 1 – –
Speed Control Integral Gain K
SI
Default power-up value – 1 – –
Maximum Control Speed f
MX
Default power-up value 3112.9 3276.7 3440.5 Hz
Speed Error Ef
CCMX
–5 – 5 %
Current Limiting
Current Limit Threshold Voltage
Range
V
ILIM
V
ILIM
= V
CSP
– V
CSM
. 12.5 – 200 mV
Current Limit Threshold Voltage V
ILIM
Default power-up value – 200 – mV
Current Limit Threshold Voltage Error
7
E
ILIM
V
IL
= 1111 –5% – 5% %FS
Fixed Off Time t
PW
Default power-up value 47.9 50.4 52.9 µs
Blank Time t
BL
Default power-up value 3.04 3.2 3.36 µs
Protection
VBB Undervoltage Lockout
V
BBON
V
BB
rising 4.2 4.4 4.6 V
V
BBOFF
V
BB
falling 3.8 4.0 4.2 V
VBB POR Voltage V
BBR
V
BB
falling – 3.2 3.5 V
VBB POR Voltage Hysteresis V
BBRHys
– 100 – mV
VDS Threshold V
DST
Default power-up value 1325 1550 1705 mV
VDS Threshold Max – High Side V
DST
V
BB
≥ 7 V – – 1705 mV
6 V ≤ V
BB
< 7 V – – 1000 mV
5.5 V ≤ V
BB
< 6 V – – 400 mV
VDS Threshold Max – Low Side V
DST
V
BB
≥ 4.2 V – – 1705 mV
VDS Threshold Offset
4,5
V
DSTO
V
DST
≥ 1 V – ±100 – mV
V
DST
≤ 1 V –150 ±50 150 mV
Temperature Warning Threshold T
JWH
Temperature increasing 125 135 150 ºC
Temperature Warning Hysteresis T
JWHhys
– 15 – ºC
Over-temperature Threshold T
JF
Temperature increasing 170 175 180 ºC
Over-temperature Hysteresis T
JHyst
Recovery = T
JF
– T
JHyst
– 15 – ºC
1
Function is correct but parameters are not guaranteed above or below the general limits (6-28 V).
2
For input and output current specications, negative current is dened as coming out of (sourcing) the specied device terminal.
3
See Figure 2 for gate drive output timing.
4
As V
SX
decreases, high-side fault occurs if (V
BAT
- V
SX
) > (V
DST
+ V
DSTO
)
5
As V
SX
increases, low-side fault occurs if (V
SX
) > (V
DST
+ V
DSTO
)
6
See Figures 4 & 5 for V
DS
monitor timing.
7
Current limit threshold voltage error is the difference between the target threshold voltage and the actual threshold voltage, referred to maximum full scale (100%) current:
E
ILIM
= 100 × (V
ILIMActual
– V
ILIM
)/200%. (V
ILIM
in mV)
ELECTRICAL CHARACTERISTICS (continued): valid at T
A
= 25°C, V
BB
= 4.2 V to 28 V (unless noted otherwise)