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ACS722 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer ACS722
Beschreibung Galvanically Isolated Current Sensor IC
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 14 Seiten
ACS722 Datasheet, Funktion
ACS722
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
FEATURES AND BENEFITS
• Patented integrated digital temperature compensation
circuitry allows for near closed loop accuracy over
temperature in an open loop sensor
• UL60950-1 (ed. 2) certified
□Dielectric Strength Voltage = 2.4 kVrms
□Basic Isolation Working Voltage = 420 Vpk/297
Vrms
• Industry-leading noise performance with greatly
improved bandwidth through proprietary amplifier and
filter design techniques
• Pin-selectable band width: 80 kHz for high bandwidth
applications or 20 kHz for low noise performance.
0.65 mΩ primary conductor resistance for low power
loss and high inrush current withstand capability
• Small footprint, low-profile SOIC8 package suitable for
space-constrained applications
• Integrated shield virtually eliminates capacitive coupling
from current conductor to die, greatly suppressing output
noise due to high dv/dt transients
• 3 to 3.6 V, single supply operation
Continued on the next page…
Package: 8-pin SOIC (suff ix LC)
CB Certif icate Number:
US-22334-A1-UL
Approximate Scale 1:1
DESCRIPTION
The AllegroACS722 current sensor IC is an economical and
precise solution for AC or DC current sensing in industrial,
commercial, and communications systems. The small package
is ideal for space constrained applications while also saving
costs due to reduced board area. Typical applications include
motor control, load detection and management, switched-mode
power supplies, and overcurrent fault protection.
The device consists of a precise, low-offset, linear Hall
sensor circuit with a copper conduction path located near the
surface of the die. Applied current flowing through this copper
conduction path generates a magnetic field which is sensed by
the integrated Hall IC and converted into a proportional voltage.
Device accuracy is optimized through the close proximity of the
magnetic field to the Hall transducer. A precise, proportional
voltage is provided by the low-offset, chopper-stabilized
BiCMOS Hall IC, which includes Allegro’s patented digital
temperature compensation, resulting in extremely accurate
performance over temperature. The output of the device has
a positive slope when an increasing current flows through the
primary copper conduction path (from pins 1 and 2, to pins 3
and 4), which is the path used for current sensing. The internal
resistance of this conductive path is 0.65 mΩ typical, providing
low power loss.
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 5 through 8). This allows the
ACS722 current sensor IC to be used in high-side current sense
applications without the use of high-side differential amplifiers
or other costly isolation techniques.
The ACS722 is provided in a small, low profile surface mount
SOIC8 package. The leadframe is plated with 100% matte tin,
Continued on the next page…
ACS722-DS
1
IP+
8
VCC
+IP ACS722
2 IP+
7
VIOUT
IP
3 IP–
–IP
4
IP–
6
BW_SEL
GND 5
CL
Typical Application
CBYPASS
0.1 µF
The ACS722 outputs an
analog signal, VIOUT , that
changes, proportionally,
with the bidirectional AC or
DC primary sensed current,
IP , within the specified
measurement range. The
BW_SEL pin can be used
to select one of the two
bandwidths to optimize the
noise performance.






ACS722 Datasheet, Funktion
ACS722
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
COMMON ELECTRICAL CHARACTERISTICS1: valid through the full range of TA = –40°C to 150°C, and at VCC =
3.3 V; unless otherwise specif ied
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max. Units
Supply Voltage
Supply Current
Output Capacitance Load
Output Resistive Load
Primary Conductor Resistance
Rise Time
VCC
ICC VCC within VCC(min) and VCC(max)
CL VIOUT to GND
RL VIOUT to GND
RIP TA = 25°C
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to GND
tr IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to VCC
3 3.3 3.6 V
– 9 12 mA
– – 10 nF
4.7 – – kΩ
– 0.65 – mΩ
– 4 – μs
– 17.5 – μs
Propagation Delay
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to GND
tpd IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to VCC
– 1 – μs
– 5 – μs
Response Time
tRESPONSE
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to GND
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to VCC
– 5 – μs
– 22.5 – μs
Internal Bandwidth
Small signal –3 dB; CL = 1 nF,
BW_SEL tied to GND
BWi
Small signal –3 dB; CL = 1nF,
BW_SEL tied to VCC
– 80 – kHz
– 20 – kHz
Noise Density
IND
Input referenced noise density;
TA = 25°C, CL = 1 nF
150
µA(rms)/
Hz
Noise
Input referenced noise; BWi = 80 kHz,
IN
T= 25°C, CL = 1 nF
Input referenced noise; BWi = 20 kHz,
T= 25°C, CL = 1 nF
42 – mA(rms)
21 – mA(rms)
Nonlinearity
ELIN Through full range of IP
– ±1
%
Saturation Voltage2
VOH RL = 4.7 kΩ, TA = 25°C
VCC
0.33
–V
VOL RL = 4.7 kΩ, TA = 25°C
– – 0.33 V
Power-On Time
tPO
Output reaches 90% of steady-state
level, TA = 25°C, IP = IPR(max) applied
64 – μs
1Device may be operated at higher primary current levels, IP , ambient temperatures, TA , and internal leadframe temperatures, provided the Maximum Junction Tem-
perature, TJ(max), is not exceeded.
2The sensor IC will continue to respond to current beyond the range of IP until the high or low saturation voltage; however, the nonlinearity in this region will be
worse than through the rest of the measurement range.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6

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ACS722 pdf, datenblatt
ACS722
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS
Power-On Time (tPO). When the supply is ramped to its operat-
ing voltage, the device requires a finite time to power its internal
components before responding to an input magnetic field.
Power-On Time, tPO , is defined as the time it takes for the output
voltage to settle within ±10% of its steady state value under an
applied magnetic field, after the power supply has reached its
minimum specified operating voltage, VCC(min), as shown in the
chart at right.
Rise Time (tr). The time interval between a) when the sensor IC
reaches 10% of its full scale value, and b) when it reaches 90%
of its full scale value. The rise time to a step response is used to
derive the bandwidth of the current sensor IC, in which ƒ(–3 dB)
= 0.35 / tr. Both tr and tRESPONSE are detrimentally affected by
eddy current losses observed in the conductive IC ground plane.
Propagation Delay (tpd ). The propagation delay is measured
as the time interval a) when the primary current signal reaches
20% of its final value, and b) when the device reaches 20% of its
output corresponding to the applied current.
V
VCC(typ.)
90% VIOUT
VCC
VIOUT
VCC(min.)
tPO
t1 t2
t1= time at which power supply reaches
minimum specified operating voltage
t2= time at which output voltage settles
within ±10% of its steady state value
under an applied magnetic field
0t
Figure 3: Power-On Time (tPO)
(%) Primary Current
90
VIOUT
Rise Time, tr
20
10
0
Propagation Delay, tpd
t
Figure 4: Rise Time (tr) and Propagation Delay (tpd )
Response Time (tRESPONSE). The time interval between a) when
the primary current signal reaches 90% of its final value, and b)
when the device reaches 90% of its output corresponding to the
applied current.
(%) Primary Current
90
VIOUT
Response Time, tRESPONSE
0
t
Figure 5: Response Time (tRESPONSE)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12

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