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ACS709
High Bandwidth, Fast Fault Response Current Sensor IC
In Thermally Enhanced Package
COMMON OPERATING CHARACTERISTICS (continued) Valid at T A = –40°C to 150°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 9
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_EN set to high for a minimum
of 20 μ s before the overcurrent event;
Overcurrent Fault Response Time
Overcurrent Fault Reset Delay
Overcurrent Fault Reset Hold Time
Overcurrent Input Pin Resistance
t OC
t OCR
t OCH
R 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
Time from V FAULTEN < V IL to
V FAULT > 0.8 × V CC , R PU = 330 k Ω
Time from V FAULTEN pin < V IL to reset of
fault latch; see Functional Block Diagram
T A = 25°C, VOC pin to GND
–
–
–
2
1.9
500
250
–
–
–
–
–
μ s
ns
ns
M Ω
VOLTAGE REFERENCE CHARACTERISTIC S
Voltage Reference Output
V ZCR
T A = 25 °C
– 0.5 × V CC
– V
Voltage Reference Output Load Current I ZCR
Source current
Sink current
3 – – mA
50 – – μ A
Voltage Reference Output Drift
? V ZCR
– ±10 – mV
1 Devices are trimmed for maximum accuracy at V CC = 5 V. The ratiometry feature of the device allows operation over the full V CC range; however, accuracy
may be slightly degraded for V CC values other than 5 V. Contact the Allegro factory for applications that require maximum accuracy for V CC = 3.3 V.
2 R F(INT) forms an RC circuit via the FILTER pin.
3 This parameter can drift by as much as 0.25% over the lifetime of this product.
4 This parameter can drift by as much as 0.3% over the lifetime of this product.
5 Calculated using the formula f 3dB = 0.35 / t r .
6 See page 8 on how to set overcurrent fault switchpoint.
7 Switchpoint can be lower at the expense of switchpoint accuracy.
8 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
9 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.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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