A3973(2007) Просмотр технического описания (PDF) - Allegro MicroSystems
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A3973 Datasheet PDF : 10 Pages
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A3973
Dual DMOS Full-Bridge
Microstepping PWM Motor Driver
ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 35 V, VDD = 5.0 V, VS = 0.5 V,
fPWM < 50 kHz (unless otherwise noted).
Limits
Characteristics
Symbol Test Conditions
Min. Typ. Max.
Control Logic (continued)
Internal Oscillator
DAC Accuracy (total error)
fOSC
OSC shorted to ground
3.0 4.0 5.0
ROSC = 51 kΩ
3.4 4.0 4.6
ET
Relative to DAC reference buffer
— ±1/2 —
output, D0 = 0, D17 = 0
Reference Input Voltage Range
Reference Buffer Offset
Reference Divider Ratio
VREF(EXT)
VOS
VREF/VS
D0 = 0, D18 = 0
D0 = 0, D18 = 1
0.5 — 2.6
— ±10 —
— 8.0 —
— 4.0 —
Reference Input Current
Internal Reference Voltage
Gain (Gm) Error (note 3)
IREF
VREF(INT)
EG
VREF = 2.0 V
D0 = 0, D17 = 0,
D18 = 0, DAC = 63
D18 = 0, DAC = 31
D18 = 1, DAC = 63
—
— ±0.5
1.94 2.0 2.06
—
0
±6
—
0
±9
—
0
±6
D18 = 1, DAC = 15
—
0 ±10
Comparator Input Offset Voltage
VIO
Propagation Delay Times
tpd
VREF = 0 V
50% to 90%:
PWM change to source on
PWM change to source off
PWM change to sink on
— ±5.0 —
500 800 1200
50 150 350
500 800 1200
PWM change to sink off
50 150 350
Crossover Dead Time
tdt
300 700 900
Thermal Shutdown Temperature
TJ
— 165 —
Thermal Shutdown Hysteresis
ΔTJ
— 15 —
UVLO Enable Threshold
VUVLO
Increasing VDD
3.9 4.2 4.45
UVLO Hysteresis
ΔVUVLO
0.05 0.10 —
NOTES: 1. Typical Data is for design information only.
2. Negative current is defined as coming out of (sourcing) the specified device terminal.
3. EG = [(VREF/Range) – VS]/(VREF/Range).
Units
MHz
MHz
LSB
V
mV
—
—
μA
V
%
%
%
%
mV
ns
ns
ns
ns
ns
°C
°C
V
V
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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