ACS709(2013) 데이터 시트보기 (PDF) - Allegro MicroSystems

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ACS709
(Rev.:2013)

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

Setting Overcurrent Fault Switchpoint

The VOC needed for setting the overcurrent fault

switchpoint can be calculated as follows:

VOC = Sens × | IOC | ,

where VOC is in mV, Sens in mV/A, and IOC (overcur-

rent fault switchpoint) in A.

| Ioc | is the overcurrent fault switchpoint for a bi-

directional (AC) current, which means a bi-directional

device will have two symmetrical overcurrent fault

switchpoints, +IOC and –IOC .

See the following graph for IOC and VOC ranges.

IOC

0.4 VCC / Sens

0.25 VCC / Sens

0

– 0.25 VCC / Sens

– 0.4 VCC / Sens

IOC versus VOC

(20BB and 35BB Versions)

Not in Valid Range

In Valid Range

0. 25 VCC

0. 4 VCC

VOC

Example: For ACS709LLFTR-35BB-T, if required overcurrent fault switchpoint is 50 A, and VCC = 5 V, then the

required VOC can be calculated as follows:

VOC = Sens × IOC = 28 × 50 = 1400 (mV)

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