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ACS710

120 kHz Bandwidth, High-Voltage Isolation Current Sensor with Integrated Overcurrent Detection

Allegro MicroSystems 

ACS710

120 kHz Bandwidth, High-Voltage Isolation

Current Sensor with Integrated Overcurrent Detection

COMMON OPERATING CHARACTERISTICS (continued): Valid at TA = –40°C to 125°C, VCC = 5 V, unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max. Units

OVERCURRENT CHARACTERISTICS (continued)

Fault Enable (FAULT_EN Pin) Delay8

Set FAULT_EN to low, VOC = 0.25 × VCC ,

COC = 0 F; then run a DC IP exceeding the

tFED

corresponding overcurrent threshold; then

reset FAULT_EN from low to high and

–

measure the delay from the rising edge of

FAULT_EN to the falling edge of ¯F¯ ¯A ¯U¯¯L¯ ¯T¯ 

15

–

µs

Fault Enable (FAULT_EN Pin) Delay

(Non-Latching versions)9

Set FAULT_EN to low, VOC = 0.25 × VCC ,

COC = 0 F; then run a DC IP exceeding the

tFED(NL)

corresponding overcurrent threshold; then

reset FAULT_EN from low to high and

–

measure the delay from the rising edge of

FAULT_EN to the falling edge of ¯F¯ ¯A ¯U¯¯L¯ ¯T¯ 

150

–

ns

FAULT_EN set to high for a minimum

of 20 µs before the overcurrent event;

Overcurrent Fault Response Time

tOC

switchpoint set at VOC = 0.25 × VCC ;

delay from IP exceeding overcurrent

–

fault threshold to V ¯F¯ ¯A ¯U¯¯L¯ ¯T¯  < 0.4 V, without

external COC capacitor

FAULT_EN set to high for a minimum

of 20 µs before the undercurrent event;

Undercurrent Fault Response Time

(Non-Latching versions)

tUC

switchpoint set at VOC = 0.25 × VCC ; delay

from IP falling below the overcurrent fault

–

threshold to V ¯F¯ ¯A ¯U¯¯L¯ ¯T¯  > 0.8 × VCC , without

external COC capacitor, RPU = 330 kΩ

Overcurrent Fault Reset Delay

tOCR

Time from VFAULTEN < VIL to

V ¯F¯ ¯A ¯U¯¯L¯ ¯T¯  > 0.8 × VCC , RPU = 330 kΩ

–

Overcurrent Fault Reset Hold Time

tOCH

Time from VFAULTEN <VIL to rising edge of

V ¯F¯ ¯A ¯U¯¯L¯ ¯T¯ 

–

Overcurrent Input Pin Resistance

ROC

TA = 25°C, VOC pin to GND

2

VOLTAGE REFERENCE CHARACTERISTICS

1.9

–

µs

3

–

µs

500

–

ns

250

–

ns

–

–

MΩ

Voltage Reference Output

VZCR

TA = 25 °C

(Not a highly accurate reference)

0.48 x VCC 0.5 × VCC 0.51 x VCC V

Voltage Reference Output Load Current

IZCR

Source current

Sink current

3

–

–

mA

50

–

–

µA

Voltage Reference Output Drift

∆VZCR

–

±10

–

mV

1 Devices are programmed for maximum accuracy at VCC = 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 VCC level. However, as a result of minor nonlinearities in the ratiometry circuit, additional output

error will result when VCC varies from the VCC level at which the device was programmed. Customers that plan to operate the device at a VCC level other

than the VCC level at which the device was programmed should contact their local Allegro sales representative regarding expected device accuracy levels

under these bias conditions.

2 RF(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 INCOMP specification in order to factor in the additional influence of noise on the

fault switchpoint.

8 Fault Enable Delay is designed to avoid false tripping of an Overcurrent (OC) fault at power-up. A 15 µs (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 µs in order to avoid false tripping of an Overcurrent (OC) fault.

Allegro MicroSystems, LLC

7

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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