ALLEGRO ACS754xCB-050 User Manual

Current Sensor: ACS754xCB-050

Package CB-PFF

Package CB-PSF

Package CB-PSS

Pin 1: VCC Pin 2: GND

Pin 3: VOUT

Terminal 4: IP+ Terminal 5: IP–

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, VCC..........................................16 V

Reverse Supply Voltage, V Output Voltage, V Reverse Output Voltage, V Output Current Source, I Output Current Sink, I Operating Temperature, Ambient, T Ambient, T Maximum Junction, T Maximum Storage Temperature, T

........................................16 V

OUT

OUT(Sink)

, L range ..................... –40 to 150ºC

, S range ....................... –20 to 85ºC

J(max)

TÜV America Certiﬁ cate Number: U8V 04 11 54214 001

........................–16 V

RCC

...................... –0.1 V

ROUT

OUT(Source)

................. 3 mA

.......................10 mA

............................. 165°C

....–65 to 170°C

The Allegro ACS75x family of current sensors provides economical and precise solutions for current sensing in industrial, automotive, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, power supplies, and overcurrent fault protection.

The device consists of a precision, low-offset linear Hall sensor circuit with a copper conduction path located near the die. Applied current ﬂ owing through this copper conduction path generates a magnetic ﬁ eld 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 signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopperstabilized BiCMOS Hall IC, which is programmed for accuracy at the factory.

The output of the device has a positive slope (>V

/ 2) when an increasing

current ﬂ ows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sensing. The internal resistance of this conductive path is typically 100 µΩ, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 5× overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 1 through 3). This allows the ACS75x family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.

The device is fully calibrated prior to shipment from the factory. The ACS75x family is lead-free. All leads are coated with 100% matte tin, and there is no lead inside the package. The heavy gauge leadframe is made of oxygen-free copper.

Features and Beneﬁ ts

• Monolithic Hall IC for high reliability

• Single +5 V supply

• 3 kV

isolation voltage between terminals 4/5 and pins 1/2/3

RMS

• 35 kHz bandwidth

• Automotive temperature range

• End-of-line factory-trimmed for gain and offset

• Ultra-low power loss: 100 µΩ internal conductor resistance

• Ratiometric output from supply voltage

• Extremely stable output offset voltage

• Small package size, with easy mounting capability

• Output proportional to ac and dc currents

Applications

• Automotive systems

• Industrial systems

• Motor control

Use the following complete part numbers when ordering:

Part Number Signal Pins Terminals Ambient

ACS754LCB-050-PFF Formed Formed

ACS754LCB-050-PSS Straight Straight

ACS754SCB-050-PFF Formed Formed ACS754SCB-050-PSF Formed Straight ACS754SCB-050-PSS Straight Straight

• Servo systems

• Power conversion

• Battery monitors

–40 to 150°CACS754LCB-050-PSF Formed Straight

–20 to 85°C

ACS754050-DS, Rev. 3

115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

Current Sensor: ACS754xCB-050

Functional Block Diagram

+5 V

IP–

Terminal 5

Cancellation

Dynamic Offset

Gain

VCC Pin 1

Voltage

Regulator

To all subcircuits

Amp Out

Temperature Coefficient

Filter

Trim Control

Offset

VOUT

Pin 3

0.1 µF

ACS754050-DS, Rev. 3

IP+

Terminal 4

GND Pin 2

115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

Current Sensor: ACS754xCB-050

ELECTRICAL CHARACTERISTICS, over operating ambient temperature range unless otherwise stated

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Primary Sensed Current I Supply Voltage V Supply Current I Output Resistance R Output Capacitance Load C Output Resistive Load R Primary Conductor Resistance R

OUT

LOAD

PRIMARYIP

VCC = 5.0 V, output open 6.5 8 10 mA I

= 1.2 mA – 1 2 Ω

OUT

VOUT to GND – – 10 nF VOUT to GND 4.7 – – kΩ

= ±100A; TA = 25°C – 100 – µΩ

Pins 1-3 and 4-5; 60 Hz, 1 minute 3.0 – – kV PERFORMANCE CHARACTERISTICS, -20°C to +85°C, VCC = 5 V unless otherwise speciﬁ ed Propagation time t Response time t

PROP

RESPONSEIP

Rise time t

IP = ±50 A, TA = 25°C – 4 – µs

= ±50 A, TA = 25°C – 12 – µs

IP = ±50 A, TA = 25°C – 11 – µs

Frequency Bandwidth f –3 dB , TA = 25°C – 35 – kHz

Sensitivity Sens

Noise V

Nonlinearity E Symmetry E Zero Current Output Voltage V

Electrical Offset Voltage (Magnetic error not included)

Magnetic Offset Error Total Output Error

(Including all offsets)

NOISE

LIN

SYM

OUT(Q)

ERROM

TOT

Over full range of IP , TA = 25°C – 40 – mV/A Over full range of I

Peak-to-peak, TA = 25°C, no external ﬁ lter

Over full range of I Over full range of I

I = 0 A, TA = 25°C – VCC / 2 – V I = 0 A, TA = 25°C –10 – 10 mV I = 0 A –20 – 20 mV I = 0 A, after excursion of 100 A – ±0.1 ±0.30 A Over full range of IP , TA = 25°C – ±1.0 – % Over full range of I

PERFORMANCE CHARACTERISTICS, -40°C to +150°C, VCC = 5 V unless otherwise speciﬁ ed Propagation time t

Response time t

Rise time t

PROP

RESPONSEIP

Frequency Bandwidth f –3 dB , T

Sensitivity Sens

Noise V

Nonlinearity E Symmetry E Zero Current Output Voltage V

Electrical Offset Voltage (Magnetic error not included)

Magnetic Offset Error Total Output Error

(Including all offsets)

NOISE

LIN

SYM

OUT(Q)

ERROM

TOT

IP = ±50 A, TA = 25°C – 4 – µs

= ±50 A, TA = 25°C – 12 – µs

IP = ±50 A, TA = 25°C – 11 – µs

= 25°C – 35 – kHz

Over full range of I Over full range of I

, TA = 25°C – 40 – mV/A

Peak-to-peak, TA = 25°C, no external ﬁ lter

Over full range of I Over full range of I

I = 0 A, TA = 25°C – VCC / 2 – V I = 0 A, TA = 25°C –10 – 10 mV I = 0 A –35 – 35 mV I = 0 A, after excursion of 100 A – ±0.1 ±0.40 A Over full range of IP , TA = 25°C – ±1.0 – % Over full range of I

–50 – 50 A

4.5 5.0 5.5 V

37.8 – 42.0 mV/A

–65 –mV

– – ±1.5 %

98 100 102 %

– – ±5.0 %

36.0 – 42.8 mV/A

–65 –mV

– – ±1.8 %

98 100 102 %

– – ±9.9 %

ACS754050-DS, Rev. 3

115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

Current Sensor: ACS754xCB-050

Deﬁ nitions of Accuracy Characteristics

Sensitivity (Sens): The change in sensor output in response to a 1 A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G / A) and the linear IC ampliﬁ er gain (mV/G). The linear IC ampliﬁ er gain is trimmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device.

Noise (V

The noise ﬂ oor is derived from the thermal and shot noise observed in Hall elements. Dividing the noise (mV) by the sensitivity (mV/ A) provides the smallest current that the device is able to resolve.

Linearity (E

its full-scale amplitude. Linearity reveals the maximum deviation from the ideal transfer curve for this transducer. Nonlinearity in the output can be attributed to the gain variation across temperature and saturation of the ﬂ ux concentrator approaching the full-scale cur- rent. The following equation is used to derive the linearity:

where ∆ gain = the gain variation as a function of temperature changes from 25ºC, % sat = the percentage of saturation of the ﬂ ux concentrator, which becomes signiﬁ cant as the current being sensed approaches full-scale ±IP , and V

Symmetry (E

tive full-scale primary current. The following equation is used to derive symmetry:

Quiescent output voltage (V

nominally remains at VCC ⁄ 2. Thus, VCC = 5 V translates into V of the Allegro linear IC quiescent voltage trim, magnetic hysteresis, and thermal drift.

): The product of the linear IC ampliﬁ er gain (mV/G) and the noise ﬂ oor for the Allegro Hall effect linear IC (≈1 G).

NOISE

): The degree to which the voltage output from the sensor varies in direct proportion to the primary current through

LIN

OUT(Q)

)

[

)

[{

OUT(Q)

can be attributed to the resolution

out_full-scale amperes

): The degree to which the absolute voltage output from the sensor varies in proportion to either a positive or nega-

SYM

100

= the output voltage (V) when the sensed current approximates full-scale ±IP .

OUT(Q)

∆ gain × % sat (

1–

[{

2(V

100

[

): The output of the sensor when the primary current is zero. For a unipolar supply voltage, it

out_full-scale amperes

out_half-scale amperes

out_+full-scale amperes

–V

OUT(Q)

out_–full-scale amperes

OUT(Q)

= 2.5 V. Variation in V

– V

OUT(Q)

– V

OUT(Q)

Electrical offset voltage (VOE): The deviation of the device output from its ideal quiescent value of VCC ⁄ 2 due to nonmagnetic causes.

Magnetic offset error (I

netic offset error is highest when the magnetic circuit has been saturated, usually when the device has been subjected to a full-scale or high-current overload condition. The magnetic offset is largely dependent on the material used as a ﬂ ux concentrator. The larger mag- netic offsets are observed at the lower operating temperatures.

Accuracy (E

total ouput error. The accuracy is illustrated graphically in the Output Voltage versus Current chart on the following page.

Accuracy is divided into four areas:

• 0 A at 25°C: Accuracy of sensing zero current ﬂ ow at 25°C, without the effects of temperature.

• 0 A over temperature: Accuracy of sensing zero current ﬂ ow including temperature effects.

• Full-scale current at 25°C: Accuracy of sensing the full-scale current at 25°C, without the effects of temperature.

• Full-scale current over ∆ temperature: Accuracy of sensing full-scale current ﬂ ow including temperature effects.

ACS754050-DS, Rev. 3

): The accuracy represents the maximum deviation of the actual output from its ideal value. This is also known as the

TOT

): The magnetic offset is due to the residual magnetism (remnant ﬁ eld) of the core material. The mag-

ERROM

115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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