ACS709_V 查看數據表（PDF） - Allegro MicroSystems

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ACS709_V

High Bandwidth, Fast Fault Response Current Sensor IC In Thermally Enhanced Package

Allegro MicroSystems 

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)

Fault Enable (FAULT_EN Pin) Delay9

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

Overcurrent Fault Response Time

Overcurrent Fault Reset Delay

Overcurrent Fault Reset Hold Time

FAULT_EN set to high for a minimum

of 20 μs before the overcurrent event;

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

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.

9Fault 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.

Allegro MicroSystems, LLC

5

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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