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Teilenummer | ACS716 |
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Beschreibung | 120 kHz Bandwidth High Voltage Isolation Current Sensor | |
Hersteller | Allegro MicroSystems | |
Logo | ||
Gesamt 22 Seiten ACS716
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 3.6 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
Package: 16-pin SOIC Hall Effect IC
Package (suffix LA)
Approximate Scale 1:1
Description
The Allegro™ ACS716 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.
TheACS716 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 ACS716 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
ACS716 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
Continued on the next page…
IP
1 IP+
2 IP+
3 IP+
4 IP+
5 IP–
6 IP–
FAULT_EN 16 Fault_EN
ACS716
VOC
VCC
15
14
FAULT 13
VIOUT 12
FILTER 11
COC
VIOUT
VCC
RH
RL
RPU
B
0.1 μF
RH, RL
CF
COC
A
Sets resistor divider reference for VOC
Noise and bandwidth limiting filter capacitor
Fault delay setting capacitor, 22 nF maximum
Use of capacitor required
Use of resistor optional, 330 kΩ recommended.
7 IP–
8 IP–
VZCR 10
GND 9
1 nF
A
CF
B If used, resistor must be connected between
¯F¯¯A¯U¯¯L¯¯T¯ pin and VCC.
ACS716-DS, Rev. 3
ACS716
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
COMMON OPERATING CHARACTERISTICS Valid at TA = –40°C to 125°C, VCC= 3.3 V, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
ELECTRICAL CHARACTERISTICS
Supply Voltage
Nominal Supply Voltage
Supply Current
Output Capacitance Load
Output Resistive Load
Magnetic Coupling from Device Conductor
to Hall Element
VCC
VCCN
ICC
CLOAD
RLOAD
MCHALL
VIOUT open, ¯F¯¯A¯U¯¯L¯¯T¯ pin high
VIOUT pin to GND
VIOUT pin to GND
Current flowing from IP+ to IP– pins
3–
– 3.3
–9
––
10 –
– 9.5
Internal Filter Resistance1
RF(INT)
Primary Conductor Resistance
RPRIMARY
ANALOG OUTPUT SIGNAL CHARACTERISTICS
Full Range Linearity2
Symmetry3
ELIN
ESYM
TA = 25°C
IP = ±IP0A
IP = ±IP0A
–
–
–0.75
99.1
1.7
1
±0.25
100
Bidirectional Quiescent Output
VOUT(QBI) IP = 0 A, TA = 25°C
– VCC×0.5
TIMING PERFORMANCE CHARACTERISTICS
VIOUT Signal Rise Time
tr
TA = 25°C, Swing IP from 0 A to IP0A,
no capacitor on FILTER pin, 100 pF from
VIOUT to GND
–
3
VIOUT Signal Propagation Time
tPROP
TA = 25°C, no capacitor on FILTER pin,
100 pF from VIOUT to GND
–
1
VIOUT Signal Response Time
tRESPONSE
TA = 25°C, Swing IP from 0 A to IP0A,
no capacitor on FILTER pin, 100 pF from
VIOUT to GND
–
4
VIOUT Large Signal Bandwidth
–3 dB, Apply IP such that VIOUT = 1 Vpk-pk,
f3dB no capacitor on FILTER pin, 100 pF from
–
VIOUT to GND
120
Power-On Time
OVERCURRENT CHARACTERISTICS
Setting Voltage for Overcurrent Switchpoint4
Signal Noise at Overcurrent
Comparator Input
tPO
VOC
INCOMP
Output reaches 90% of steady-state level,
no capacitor on FILTER pin, TA = 25°C
–
VCC×0.25
–
35
–
±1
Overcurrent Fault Switchpoint Error5,6
Overcurrent ¯F¯¯A¯U¯¯L¯¯T¯ Pin Output Voltage
EOC
V ¯F¯¯A¯U¯¯L¯¯T¯
Switchpoint in VOC safe operating area;
assumes INCOMP = 0 A
1 mA sink current at ¯F¯¯A¯U¯¯L¯¯T¯ pin
–
–
±5
–
Fault Enable (FAULT_EN Pin) Input Low
Voltage Threshold
VIL
––
Max. Units
3.6 V
–V
11 mA
10 nF
– kΩ
– G/A
– kΩ
– mΩ
0.75
100.9
–
%
%
V
– μs
– μs
– μs
– kHz
– μs
VCC×0.4
–
V
A
–
0.4
0.1 × VCC
%
V
V
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
6 Page ACS716
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Characteristic Performance Data
Data taken using the ACS716-12CB
Accuracy Data
Electrical Offset Voltage versus Ambient Temperature
50
40
30
20
10
0
-10
-20
-30
-40
-50
–50 -25 0 25 50 75 100 125 150
TA (°C)
40.0
39.5
39.0
38.5
38.0
37.5
37.0
36.5
36.0
35.5
–50
Sensitivity versus Ambient Temperature
-25 0 25 50 75 100 125
TA (°C)
150
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
–50
Nonlinearity versus Ambient Temperature
-25 0 25 50 75 100 125 150
TA (°C)
101.00
100.75
100.50
100.25
100.00
99.75
99.50
99.25
99.00
–50
Symmetry versus Ambient Temperature
-25 0 25 50 75 100 125
TA (°C)
150
Total Output Error versus Ambient Temperature
8.0
6.0
4.0
2.0
0
-2.0
-4.0
-6.0
-8.0
–50 -25 0 25 50 75 100 125 150
TA (°C)
Typical Maximum Limit
Mean
Typical Minimum Limit
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12
12 Page | ||
Seiten | Gesamt 22 Seiten | |
PDF Download | [ ACS716 Schematic.PDF ] |
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