ACS709
High Bandwidth, Fast Fault Response Current Sensor IC
In Thermally Enhanced Package
COMMON OPERATING CHARACTERISTICS (continued) Valid at TA = –40°C to 150°C, VCC = 5 V, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max. Units
OVERCURRENT CHARACTERISTICS (continued)
Overcurrent Fault Response Time
Overcurrent Fault Reset Delay
Overcurrent Fault Reset Hold Time
Switchpoint set at 90% of IPOA,
tOC
delay from IP exceeding overcurrent
fault threshold to V ¯F¯¯A¯U¯¯L¯¯T¯ < 0.4 V, without
–
external COC capacitor
tOCR
Time from VFAULTEN < VIL to
VFAULT > 0.8 × VCC , RPU = 330 kΩ
–
tOCH
Time from VFAULTEN pin < VIL to reset of
fault latch; see Functional Block Diagram
–
1.9
–
μs
500
–
ns
250
–
ns
Overcurrent Input Pin Resistance
ROC
VOLTAGE REFERENCE CHARACTERISTICS
TA = 25°C, VOC pin to GND
2
–
–
MΩ
Voltage Reference Output
Voltage Reference Output Load Current
VZCR
IZCR
TA = 25 °C
Source current
Sink current
–
0.5 × VCC
–
V
3
–
–
mA
50
–
–
μA
Voltage Reference Output Drift
∆VZCR
–
±10
–
mV
1Devices are trimmed for maximum accuracy at VCC = 5 V. The ratiometry feature of the device allows operation over the full VCC range; however, accuracy
may be slightly degraded for VCC values other than 5 V. Contact the Allegro factory for applications that require maximum accuracy for VCC = 3.3 V.
2RF(INT) forms an RC circuit via the FILTER pin.
3This parameter can drift by as much as 0.25% over the lifetime of this product.
4This parameter can drift by as much as 0.3% over the lifetime of this product.
5Calculated using the formula f3dB = 0.35 / tr .
6See page 8 on how to set overcurrent fault switchpoint.
7Switchpoint can be lower at the expense of switchpoint accuracy.
8This error specification does not include the effect of noise. See the INCOMP specification in order to factor in the additional influence of noise on the
fault switchpoint.
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com