Dual Full-Bridge MOSFET Driver
with Microstepping Translator
A3986
ELECTRICAL CHARACTERISTICS, continued, at TA = 25°C, VDD = 5 V, VBB = 12 to 50V, unless noted otherwise
Characteristics
Current Control
Symbol
Test Conditions
Min.
Typ.
Max. Units
Blank Time
tBLANK
tOFF
ROSC = 10 kΩ,
ROSC = 10 kΩ, , SR= High
1.2
18.12
0.8
1.9
–
1.5
–
1.8
23.16
2
μs
μs
V
Fixed Off-Time
Reference Input Voltage
Internal Reference Voltage
Current Trip Point Error3
Reference Input Current1
Oscillator Frequency
Protection
VREF
–
VREFInt 20 kꢀ to VDD
2.0
–
2.1
±5
V
EITRIP
IREF
VREF = 2 V
%
–3
0
3
μA
MHz
fOSC
ROSC = 10 kꢀ
3.2
4
4.8
VREG Undervoltage Lockout
VREGUV Decreasing VREG
VREGUVHys
7.5
100
2.45
50
8
8.5
–
V
mV
V
VREG Undervoltage Lockout
Hysteresis
200
2.7
100
165
15
VDD Undervoltage Lockout
VDDUV
VDDUVHys
TTSD
Decreasing VDD
2.95
–
VDD Undervoltage Lockout
Hysteresis
mV
ºC
ºC
Overtemperature Shut Down
Temperature increasing
–
–
Overtemperature Shut Down
Hysteresis
TTSDHys Recovery = TTSD – TTSDHys
–
–
Control Timing
STEP Low Duration
STEP High Duration
tSTEPL
tSTEPH
1
1
–
–
–
–
μs
μs
Input change to STEP pulse;
MS1, MS2, DIR
Setup Duration
tSU
200
–
–
ns
Input change from STEP pulse;
MS1, MS2, DIR
Hold Duration
tH
200
1
–
–
–
–
ns
Wake Time Duration
tWAKE
ms
1For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.
2A RESET pulse of this duration will reset the translator to the Home position without entering Sleep mode.
3Current Trip Point Error is the difference between actual current trip point and the target current trip point, referred to full
scale (100%) current: EITRIP = 100×(ITRIPActual – ITRIPTarget) / IFullScale %
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
