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ACS710
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
COMMON OPERATING CHARACTERISTICS (continued) Valid at T A = –40°C to 125°C, V CC = 5 V, unless otherwise specified
Characteristic Symbol
Test Conditions
Min.
Typ.
Max.
Units
OVERCURRENT CHARACTERISTICS (continued)
Fault Enable (FAULT_EN Pin) Delay 8
t FED
Set FAULT_EN to low, V OC = 0.25 × V CC ,
C OC = 0 F; then run a DC I P exceeding the
corresponding overcurrent threshold; then
reset FAULT_EN from low to high and
–
15
–
μ s
measure the delay from the rising edge of
FAULT_EN to the falling edge of ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ
Fault Enable (FAULT_EN Pin) Delay
(Non-Latching versions) 9
t FED(NL)
Set FAULT_EN to low, V OC = 0.25 × V CC ,
C OC = 0 F; then run a DC I P exceeding the
corresponding overcurrent threshold; then
reset FAULT_EN from low to high and
–
150
–
ns
measure the delay from the rising edge of
FAULT_EN to the falling edge of ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ
FAULT_EN set to high for a minimum
of 20 μ s before the overcurrent event;
Overcurrent Fault Response Time
t OC
switchpoint set at V OC = 0.25 × V CC ;
delay from I P exceeding overcurrent
fault threshold to V ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ < 0.4 V, without
external C OC capacitor
–
1.9
–
μ s
FAULT_EN set to high for a minimum
of 20 μ s before the undercurrent event;
Undercurrent Fault Response Time
(Non-Latching versions)
Overcurrent Fault Reset Delay
Overcurrent Fault Reset Hold Time
Overcurrent Input Pin Resistance
t UC
t OCR
t OCH
R OC
switchpoint set at V OC = 0.25 × V CC ; delay
from I P falling below the overcurrent fault
threshold to V ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ > 0.8 × V CC , without
external C OC capacitor, R PU = 330 k Ω
Time from V FAULTEN < V IL to
V ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ > 0.8 × V CC , R PU = 330 k Ω
Time from V FAULTEN <V IL to rising edge of
V ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ
T A = 25°C, VOC pin to GND
–
–
–
2
3
500
250
–
–
–
–
–
μ s
ns
ns
M Ω
VOLTAGE REFERENCE CHARACTERISTIC S
Voltage Reference Output
Voltage Reference Output Load Current
Voltage Reference Output Drift
V ZCR
I ZCR
? V ZCR
T A = 25 °C
(Not a highly accurate reference)
Source current
Sink current
0.48 x V CC
3
50
–
0.5 × V CC
–
–
±10
0.51 x V CC
–
–
–
V
mA
μ A
mV
1 Devices are programmed for maximum accuracy at V CC = 5 V. The device contains ratiometry circuits that accurately alter the 0 A Output Voltage and
Sensitivity level of the device in proportion to the applied V CC level. However, as a result of minor nonlinearities in the ratiometry circuit, additional output
error will result when V CC varies from the V CC level at which the device was programmed. Customers that plan to operate the device at a V CC level other
than the V CC level at which the device was programmed should contact their local Allegro sales representative regarding expected device accuracy levels
under these bias conditions.
2 R F(INT) forms an RC circuit via the FILTER pin.
3 This parameter can drift by as much as 0.8% over the lifetime of this product.
4 This parameter can drift by as much as 1% over the lifetime of this product.
5 See page 8 on how to set overcurrent fault switchpoint.
6 Switchpoint can be lower at the expense of switchpoint accuracy.
7 This error specification does not include the effect of noise. See the I
fault switchpoint.
NCOMP specification in order to factor in the additional influence of noise on the
8 Fault Enable Delay is designed to avoid false tripping of an Overcurrent (OC) fault at power-up. A 15 μ s (typical) delay will always be needed, every
time FAULT_EN is raised from low to high, before the device is ready for responding to any overcurrent event.
9 During power-up, this delay is 15 μ s in order to avoid false tripping of an Overcurrent (OC) fault.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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