ACS710
120 kHz Bandwidth, High-Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
FEATURES AND BENEFITS
▪ Industry-leading noise performance with greatly improved
bandwidth through proprietary amplifier and filter design
techniques
▪ Small footprint package suitable for space-constrained
applications
▪ 1 mΩ primary conductor resistance for low power loss
▪ High isolation voltage, suitable for line-powered
applications
▪ User-adjustable Overcurrent Fault level
▪ Overcurrent Fault signal typically responds to an
overcurrent condition in < 2 μs
▪ Integrated shield virtually eliminates capacitive coupling
from current conductor to die due to high dV/dt voltage
transients
▪ Filter pin capacitor improves resolution in low bandwidth
applications
▪ 3 to 5.5 V single supply operation
▪ Factory-trimmed sensitivity and quiescent output voltage
▪ Chopper stabilization results in extremely stable quiescent
output voltage
▪ Ratiometric output from supply voltage
CB Certificate Number:
US-23711-A2-UL
PACKAGE: 16-Pin SOIC Hall-Effect IC
Package (suffix LA)
DESCRIPTION
The Allegro™ ACS710 current sensor provides economical and
precise means for current sensing applications in industrial,
commercial, and communications systems. The device is offered
in a small footprint surface-mount package that allows easy
implementation in customer applications.
The ACS710 consists of a precision linear Hall sensor integrated
circuit with a copper conduction path located near the surface
of the silicon die. Applied current flows through the copper
conduction path, and the analog output voltage from the Hall
sensor linearly tracks the magnetic field generated by the
applied current. The accuracy of the ACS710 is maximized
with this patented packaging configuration because the Hall
element is situated in extremely close proximity to the current
to be measured.
High-level immunity to current conductor dV/dt and stray
electric fields, offered by Allegro proprietary integrated shield
technology, results in low ripple on the output and low offset
drift in high-side, high-voltage applications.
The voltage on the Overcurrent Input (VOC pin) allows
customers to define an overcurrent fault threshold for the device.
When the current flowing through the copper conduction path
(between the IP+ and IP– pins) exceeds this threshold, the open
drain Overcurrent Fault pin will transition to a logic low state.
Factory programming of the linear Hall sensor inside of the
ACS710 results in exceptional accuracy in both analog and
digital output signals.
The internal resistance of the copper path used for current
sensing is typically 1 mΩ, for low power loss. Also, the current
conduction path is electrically isolated from the low-voltage
Not to scale
Continued on the next page…
Typical Application Circuit
1
2
3
IP
4
5
6
7
8
IP+
IP+
IP+
FAULT_EN
ACS710
VOC
VCC
IP+
FAULT
IP–
VIOUT
IP–
FILTER
IP–
VZCR
IP–
GND
ACS710-DS, Rev. 17
MCO-0000196
16 Fault_EN
RH
VCC
RH, RL
15
14
12
11
RPU
COC
VIOUT
10
9
CF
RL
13
1 nF
A
COC
0.1 µF
B
CF
Sets resistor divider reference for VOC
Noise and bandwidth limiting filter capacitor
Fault delay setting capacitor, 22 nF maximum
A
Use of capacitor required
B
Use of resistor optional, 330 kΩ recommended.
If used, resistor must be connected between
¯F
¯ ¯A
¯U¯¯L¯ ¯T
¯ pin and VCC.
February 7, 2022
ACS710
120 kHz Bandwidth, High-Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
DESCRIPTION (continued)
sensor inputs and outputs. This allows the ACS710 family of sensors
to be used in applications requiring electrical isolation, without the
use of opto-isolators or other costly isolation techniques.
Pb‑based solder balls, currently exempt from RoHS. The device is
fully calibrated prior to shipment from the factory.
The ACS710 is provided in a small, surface-mount SOIC16 package.
The leadframe is plated with 100% matte tin, which is compatible
with standard lead (Pb) free printed circuit board assembly processes.
Internally, the device is Pb-free, except for flip-chip high-temperature
Applications include:
• Motor control and protection
• Load management and overcurrent detection
• Power conversion and battery monitoring / UPS systems
SELECTION GUIDE
Part Number
ACS710KLATR-6BB-T [2][3]
Sens (typ)
at VCC = 5 V
(mV/A)
IP
(A)
±6
151
ACS710KLATR-10BB-T [2]
±10
85
ACS710KLATR-12CB-T [2]
±12.5
56
ACS710KLATR-25CB-T [2]
±25
ACS710KLATR-6BB-NL-T [2]
±6
151
ACS710KLATR-10BB-NL-T [2]
±10
85
ACS710KLATR-12CB-NL-T [2]
±12.5
56
ACS710KLATR-25CB-NL-T [2]
±25
Latched
Fault
TA
(°C)
Yes
–40 to 125
Tape and Reel, 1000 pieces per reel
No
–40 to 125
Tape and Reel, 1000 pieces per reel
Packing [1]
28
28
[1] Contact Allegro
[2] Variant
for packing options.
not intended for automotive applications.
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2
ACS710
120 kHz Bandwidth, High-Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Supply Voltage
Notes
Rating
Unit
VCC
8
V
Filter Pin
VFILTER
8
V
Analog Output Pin
VIOUT
32
V
VOC
8
V
Overcurrent Input Pin
¯ ¯A
¯U¯¯L¯ ¯T
¯ Pin
Overcurrent ¯F
V ¯F¯ ¯A
¯U¯¯L¯ ¯T
¯
8
V
Fault Enable (FAULT_EN) Pin
VFAULTEN
8
V
Voltage Reference Output Pin
VZCR
8
V
DC Reverse Voltage: VCC, FILTER, VIOUT, VOC,
¯F
¯ ¯A
¯U¯¯L¯ ¯T
¯, FAULT_EN, and VZCR Pins
VRdcx
–0.5
V
Excess to Supply Voltage: FILTER, VIOUT, VOC,
¯F
¯ ¯A
¯U¯¯L¯ ¯T
¯, FAULT_EN, and VZCR Pins
VEX
0.3
V
IIOUT(Source)
3
mA
IIOUT(Sink)
1
mA
–40 to 125
°C
Output Current Source
Output Current Sink
Operating Ambient Temperature
TA
Voltage by which pin voltage can exceed the VCC pin
voltage
Range K
Junction Temperature
TJ(max)
165
°C
Storage Temperature
Tstg
–65 to 170
°C
ISOLATION CHARACTERISTICS
Characteristic
Symbol
Dielectric Surge Strength Test Voltage
VSURGE
Dielectric Strength Test Voltage*
Working Voltage for Basic Isolation
VISO
VWVBI
Notes
Rating
Unit
Tested ±5 pulses at 2/minute in compliance to IEC 61000-4-5
1.2 µs (rise) / 50 µs (width).
6000
V
Agency type-tested for 60 seconds per IEC/UL 60950-1 (2nd Edition).
3600
VRMS
Agency type-tested for 60 seconds per UL 1577.
3000
VRMS
Maximum approved working voltage for basic (single) isolation
according to IEC/UL 60950-1 (2nd Edition).
870
VPK or VDC
616
VRMS
Clearance
DCL
Minimum distance through air from IP leads to signal leads.
7.5
mm
Creepage
DCR
Minimum distance along package body from IP leads to signal leads.
7.5
mm
*Production tested for 1 second at 3600 VRMS in accordance with both UL 1577 and IEC/UL 60950-1 (edition 2).
THERMAL CHARACTERISTICS
Characteristic
Symbol
Test Conditions
mm2
Package Thermal Resistance
RθJA
Value
Unit
17
°C/W
mm2
When mounted on Allegro demo board with 1332
(654
on component side and 678 mm2 on opposite side) of 2 oz. copper connected to
the primary leadframe and with thermal vias connecting the copper layers.
Performance is based on current flowing through the primary leadframe
and includes the power consumed by the PCB.
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
3
120 kHz Bandwidth, High-Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
ACS710
Functional Block Diagram
Latching Version
VCC
Hall
Bias
FAULT_EN
D
Q
CLK
R
POR
POR
Fault Latch
FAULT Reset
Drain
–
VOC
+
2VREF
OC Fault
Control
Logic
FAULT
3 mA
Fault
Comparator
–
Sensitivity
Trim
IP+
VZCR
+
VIOUT
Signal
Recovery
RF(INT)
Hall
Amplifier
IP–
VOUT(Q)
Trim
GND
Pinout Diagram
IP+ 1
16 FAULT_EN
IP+ 2
15 VOC
IP+ 3
14 VCC
IP+ 4
13 FAULT
IP– 5
12 VIOUT
IP– 6
11 FILTER
IP– 7
10 VZCR
IP– 8
9 GND
FILTER
Terminal List Table, Latching Version
Number
Name
Description
1,2,3,4
IP+
Sensed current copper conduction path pins. Terminals for current being sensed;
fused internally, loop to IP– pins; unidirectional or bidirectional current flow.
5,6,7,8
IP–
Sensed current copper conduction path pins. Terminals for current being sensed;
fused internally, loop to IP+ pins; unidirectional or bidirectional current flow.
9
GND
Device ground connection.
10
VZCR
Voltage Reference Output pin. Zero current (0 A) reference; output voltage on this
pin scales with VCC . (Not a highly accurate reference.)
11
FILTER
Filter pin. Terminal for an external capacitor connected from this pin to GND to set
the device bandwidth.
12
VIOUT
Analog Output pin. Output voltage on this pin is proportional to current flowing
through the loop between the IP+ pins and IP– pins.
13
¯F
¯ ¯A
¯U¯¯L¯ ¯T
¯
Overcurrent Fault pin. When current flowing between IP+ pins and IP– pins
exceeds the overcurrent fault threshold, this pin transitions to a logic low state.
14
VCC
Supply voltage.
15
VOC
Overcurrent Input pin. Analog input voltage on this pin sets the overcurrent fault
threshold.
16
¯ ¯A
¯U¯¯L¯ ¯T
¯ when low.
FAULT_EN Enables overcurrent faulting when high. Resets ¯F
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
4
120 kHz Bandwidth, High-Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
ACS710
Functional Block Diagram
Non-Latching Version
VCC
Hall
Bias
POR
Drain
–
VOC
+
FAULT_EN
FAULT
2VREF
FAULT Reset
3 mA
OC Fault
IP+
VZCR
Fault
Comparator
Sensitivity
Trim
VIOUT
Signal
Recovery
RF(INT)
Hall
Amplifier
IP–
VOUT(Q)
Trim
GND
Pinout Diagram
IP+ 1
16 FAULT_EN
IP+ 2
15 VOC
IP+ 3
14 VCC
IP+ 4
13 FAULT
IP– 5
12 VIOUT
IP– 6
11 FILTER
IP– 7
10 VZCR
IP– 8
9 GND
FILTER
Terminal List Table, Non-Latching Version
Number
Name
Description
1,2,3,4
IP+
Sensed current copper conduction path pins. Terminals for current being sensed;
fused internally, loop to IP– pins; unidirectional or bidirectional current flow.
5,6,7,8
IP–
Sensed current copper conduction path pins. Terminals for current being sensed;
fused internally, loop to IP+ pins; unidirectional or bidirectional current flow.
9
GND
Device ground connection.
10
VZCR
Voltage Reference Output pin. Zero current (0 A) reference; output voltage on this
pin scales with VCC . (Not a highly accurate reference.)
11
FILTER
Filter pin. Terminal for an external capacitor connected from this pin to GND to set
the device bandwidth.
12
VIOUT
Analog Output pin. Output voltage on this pin is proportional to current flowing
through the loop between the IP+ pins and IP– pins.
13
¯F
¯ ¯A
¯U¯¯L¯ ¯T
¯
Overcurrent Fault pin. When current flowing between IP+ pins and IP– pins
exceeds the overcurrent fault threshold, this pin transitions to a logic low state.
14
VCC
Supply voltage.
15
VOC
Overcurrent Input pin. Analog input voltage on this pin sets the overcurrent fault
threshold.
16
FAULT_EN Enables overcurrent faulting when high.
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
5
ACS710
120 kHz Bandwidth, High-Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
COMMON OPERATING CHARACTERISTICS: Valid at TA = –40°C to 125°C, VCC = 5 V, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
ELECTRICAL CHARACTERISTICS
Supply Voltage [1]
VCC
3
–
5.5
V
Nominal Supply Voltage
VCCN
–
5
–
V
¯ ¯A
¯U¯¯L¯ ¯T
¯ pin high
VIOUT open, ¯F
–
11
14.5
mA
Output Capacitance Load
Supply Current
CLOAD
VIOUT pin to GND
–
–
10
nF
Output Resistive Load
RLOAD
VIOUT pin to GND
10
–
–
kΩ
Current flowing from IP+ to IP– pins
–
9.5
–
G/A
Magnetic Coupling from Device Conductor
to Hall Element
Internal Filter Resistance [2]
Primary Conductor Resistance
ICC
MCHALL
RF(INT)
–
1.7
–
kΩ
TA = 25°C
–
1
–
mΩ
ELIN
IP = ±IP0A
–0.75
±0.25
0.75
%
ESYM
IP = ±IP0A
RPRIMARY
ANALOG OUTPUT SIGNAL CHARACTERISTICS
Full Range Linearity [3]
Symmetry [4]
Bidirectional Quiescent Output
VOUT(QBI)
99.1
100
100.9
%
IP = 0 A, TA = 25°C
–
VCC×0.5
–
V
Noise Density
IND
Input-referenced noise density; TA = 25°C,
CL = 4.7 nF
–
400
–
µA
/√(Hz)
Noise
IN
Input referenced noise at 120 kHz
Bandwidth; TA = 25°C,CL = 4.7 nF
–
170
–
mArms
tr
TA = 25°C, Swing IP from 0 A to IP0A,
no capacitor on FILTER pin, 100 pF from
VIOUT to GND
–
3
–
μs
TA = 25°C, no capacitor on FILTER pin,
100 pF from VIOUT to GND
–
1
–
μs
TA = 25°C, Swing IP from 0 A to IP0A,
no capacitor on FILTER pin, 100 pF from
VIOUT to GND
–
4
–
μs
TIMING PERFORMANCE CHARACTERISTICS
VIOUT Signal Rise Time
VIOUT Signal Propagation Time
tPROP
VIOUT Signal Response Time
tRESPONSE
VIOUT Large Signal Bandwidth
f3dB
–3 dB, Apply IP such that VIOUT =
1 Vpk-pk, no capacitor on FILTER pin,
100 pF from VIOUT to GND
–
120
–
kHz
Power-On Time
tPO
Output reaches 90% of steady-state level,
no capacitor on FILTER pin, TA = 25°C
–
35
–
μs
OVERCURRENT CHARACTERISTICS
Setting Voltage for Overcurrent Switch Point [5]
VOC
VCC × 0.25
–
VCC × 0.4
V
Signal Noise at Overcurrent Comparator Input
INCOMP
–
±1
–
A
Switch point in VOC safe operating area;
assumes INCOMP = 0 A
–
±5
–
%
¯ ¯A
¯U¯¯L¯ ¯T
¯ pin
1 mA sink current at ¯F
–
–
0.4
V
Overcurrent Fault Switch Point Error [6][7]
¯ ¯A
¯U¯¯L¯ ¯T
¯ Pin Output Voltage
Overcurrent ¯F
EOC
V ¯F¯ ¯A
¯U¯¯L¯ ¯T
¯
Fault Enable (FAULT_EN Pin) Input Low
Voltage Threshold
VIL
–
–
0.1 × VCC
V
Fault Enable (FAULT_EN Pin) Input High
Voltage Threshold
VIH
0.8 × VCC
–
–
V
Fault Enable (FAULT_EN Pin) Input
Resistance
RFEI
–
1
–
MΩ
Continued on the next page…
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
6
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
tFED
Set FAULT_EN to low, VOC = 0.25 × VCC ,
COC = 0 F; then run a DC IP exceeding the
corresponding overcurrent threshold; then
reset FAULT_EN from low to high and
measure the delay from the rising edge of
¯ ¯A
¯U¯¯L¯ ¯T
¯
FAULT_EN to the falling edge of ¯F
–
15
–
µs
tFED(NL)
Set FAULT_EN to low, VOC = 0.25 × VCC ,
COC = 0 F; then run a DC IP exceeding the
corresponding overcurrent threshold; then
reset FAULT_EN from low to high and
measure the delay from the rising edge of
¯ ¯A
¯U¯¯L¯ ¯T
¯
FAULT_EN to the falling edge of ¯F
–
150
–
ns
tOC
FAULT_EN set to high for a minimum
of 20 µs before the overcurrent event;
switch point set at VOC = 0.25 × VCC ;
delay from IP exceeding overcurrent
fault threshold to V ¯F¯ ¯A
¯U¯¯L¯ ¯T
¯ 0.8 × VCC , without external COC
capacitor, RPU = 330 kΩ
–
3
–
µs
Overcurrent Fault Reset Delay
tOCR
Time from VFAULTEN < VIL to
V ¯F¯ ¯A
¯U¯¯L¯ ¯T
¯ > 0.8 × VCC , RPU = 330 kΩ
–
500
–
ns
Overcurrent Fault Reset Hold Time
tOCH
Time from VFAULTEN
