ACS709LLFTR-20BB-T Allegro Microsystems Inc, ACS709LLFTR-20BB-T Datasheet - Page 11

• Manufacturer Part Number: ACS709LLFTR-20BB-T
• Description: IC, CURRENT SENSOR, 11mA, QSOP-24
• Manufacturer: Allegro Microsystems Inc
• Series: -r

Specifications of ACS709LLFTR-20BB-T

• Quiescent Current: 11mA
• Bandwidth: 120kHz
• Sensor Case Style: QSOP
• No. Of Pins: 24
• Supply Voltage Range: 3V To 5.5V
• Operating Temperature Range: -40°C To +150°C
• Polarization: Unipolar
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Mounting: Surface Mount
• Operating Temp Range: -40C to 150C
• Operating Temperature Classification: Automotive
• Current - Sensing: ±37.5A
• Accuracy: ±2.5%
• Sensitivity: 56mV/A
• Current - Supply: 11mA
• Sensor Type: Hall Effect
• Voltage - Supply: 3 V ~ 5.5 V
• Output: 2.5V
• Frequency: 120kHz
• Response Time: 4µs
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 24-SSOP (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ACS709
The V
switchpoint can be calculated as follows:
where V
rent fault switchpoint) in A.
OC
OC
needed for setting the overcurrent fault
is in mV, Sens in mV/A, and I
Example: For ACS709LLFTR-35BB-T, if required overcurrent fault switchpoint is 50 A, and V
required V
– 0.25 V
– 0.4 V
0.4 V
0.25 V
V
OC
CC
CC
CC
CC
= Sens × | I
/ Sens
OC
/ Sens
/ Sens
/ Sens
can be calculated as follows:
0
I
OC
OC
Setting Overcurrent Fault Switchpoint
High Bandwidth, Fast Fault Response Current Sensor IC
| ,
V
OC
0. 25 V
OC
(overcur-
= Sens × I
I
OC
CC
versus V
OC
= 28 × 50 = 1400 (mV)
| 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, +I
See the following graph for I
0. 4 V
OC
CC
In Thermally Enhanced Package
V
OC
OC
and –I
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
CC
Not in Valid Range
In Valid Range
OC
= 5 V, then the
.
OC
and V
OC
ranges.
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