A4962 Datasheet, PDF (8/42 Pages) Allegro MicroSystems – Sensorless BLDC Controller

A4962
Sensorless BLDC Controller
ELECTRICAL CHARACTERISTICS (continued): valid at T_A= 25°C, V_BB = 4.2 V to 28 V (unless noted otherwise)
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Start Duty Cycle
Motor Run Parameters
D_ST Default power-up value
47.5
50
52.5
%
Phase Advance (in electrical degrees)
Position Control Proportional Gain
Position Control Integral Gain
Speed Control Proportional Gain
Speed Control Integral Gain
Maximum Control Speed
Speed Error
Current Limiting
θ_ADV
K_CP
K_CI
K_SP
K_SI
f_MX
Ef_CCMX
Default power-up value
Default power-up value
Default power-up value
Default power-up value
Default power-up value
Default power-up value
14
15
16
º
–
1
–
–
–
1
–
–
–
1
–
–
–
1
–
–
3112.9 3276.7 3440.5
Hz
–5
–
5
%
Current Limit Threshold Voltage
Range
V_ILIM
V_ILIM = V_CSP – V_CSM.
12.5
–
200
mV
Current Limit Threshold Voltage
Current Limit Threshold Voltage Error⁷
Fixed Off Time
Blank Time
Protection
V_ILIM
E_ILIM
t_PW
t_BL
Default power-up value
V_IL = 1111
Default power-up value
Default power-up value
–
200
–
mV
–5%
–
5%
%FS
47.9
50.4
52.9
µs
3.04
3.2
3.36
µs
VBB Undervoltage Lockout
V_BBON
V_BBOFF
V_BB rising
V_BB falling
4.2
4.4
4.6
V
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
V_BB ≥ 7 V
–
–
1705
mV
VDS Threshold Max – High Side
V_DST 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
V_DST ≤ 1 V
–
±100
–
mV
–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 specifications, negative current is defined as coming out of (sourcing) the specified device terminal.}
3 _{See Figure 2 for gate drive output timing.}
4 _{As VSX decreases, high-side fault occurs if (VBAT - VSX) > (VDST + VDSTO)}
5 _{As VSX increases, low-side fault occurs if (VSX) > (VDST + VDSTO)}
6 _{See Figures 4 & 5 for VDS 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)
Allegro MicroSystems, LLC
8
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com