ACS755LCB-100-PFF Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor Last Time Buy These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change: November 1, 2010 Deadline for receipt of LAST TIME BUY orders: April 30, 2011 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the ACS758LCB-100U-PFF-T. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. ACS755xCB-100 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor Features and Benefits Description ▪ Monolithic Hall IC for high reliability ▪ Single +5 V supply ▪ 3 kVRMS isolation voltage between terminals 4/5 and pins 1/2/3 for up to 1 minute ▪ 27 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 DC currents The Allegro ACS755 family of current sensor ICs provides economical and precise solutions for DC 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 circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which the Hall IC converts 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, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory. Package: 5 pin package (leadform PFF) The output of the device will be valid when a current flows through the primary copper conduction path from terminal 4 to terminal 5, which is the path used for current sampling. The internal resistance of this conductive path is 100 μΩ typical, providing low power loss. Continued on the next page… Typical Application +5 V 4 VCC IP+ ACS755 IP GND 5 1 CBYP 0.1 µF 2 CF IP– VIOUT 3 RF VOUT Application 1. The ACS755 outputs an analog signal, VOUT . that varies linearly with the unidirectional DC primary sampled current, IP , within the range specified. CF is recommended for noise management, with values that depend on the application. ACS755100-DS Rev. 11 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor ACS755xCB-100 Description (continued) 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 signal leads (pins 1 through 3). This allows the ACS755 family of sensor ICs 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 (Pb) free. All leads are plated with 100% matte tin, and there is no Pb inside the package. The heavy gauge leadframe is made of oxygen-free copper. Selection Guide Part Number TOP (°C) Primary Sampled Current, IP (A) Sensitivity Sens (Typ.) (mV/A) Bandwidth (kHz) Terminals Signal Pins ACS755LCB-100-PFF2 –40 to 150 100 40 27 Formed Formed Package Packing1 170 pieces per bulk bag 1Contact Allegro for additional packing options. is in production but has been determined to be LAST TIME BUY. This classification indicates that the variant is obsolete and notice has been given. Sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Status date change November 1, 2010. Deadline for receipt of LAST TIME BUY orders is April 30, 2011. 2Variant Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Supply Voltage VCC 16 V Reverse Supply Voltage VRCC –16 V Output Voltage VIOUT 16 V Reverse Output Voltage VRIOUT –0.1 V VISO 353 VAC, 500 VDC, or Vpk V IIN 200 A Maximum Basic Isolation Voltage Maximum Rated Input Current Output Current Source Output Current Sink Nominal Operating Ambient Temperature Maximum Junction Storage Temperature IOUT(Source) 3 mA IOUT(Sink) 10 mA Range L –40 to 150 ºC Range S TA –20 to 85 ºC TJ(max) 165 ºC Tstg –65 to 170 ºC TÜV America Certificate Number: U8V 04 11 54214 001 Fire and Electric Shock EN60950-1:2001 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor ACS755xCB-100 Functional Block Diagram +5 V VCC IP+ Voltage Regulator Filter Dynamic Offset Cancellation To all subcircuits Amp Gain Out Temperature Coefficient VIOUT 0.1 μF Offset Trim Control GND IP– Pin-out Diagram IP+ IP– 4 3 VIOUT 2 GND 1 VCC 5 Terminal List Table Number Name 1 VCC Device power supply pin Description 2 GND Signal ground pin 3 VIOUT 4 IP+ Terminal for current being sampled 5 IP– Terminal for current being sampled Analog output signal pin Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 ACS755xCB-100 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor ELECTRICAL CHARACTERISTICS, over operating ambient temperature range unless otherwise stated Characteristic Symbol Test Conditions Min. Primary Sampled Current IP 0 Supply Voltage VCC 4.5 Supply Current ICC VCC = 5.0 V, output open 6.5 Output Resistance ROUT IOUT = 1.2 mA – Output Capacitance Load CLOAD VOUT to GND – VOUT to GND 4.7 Output Resistive Load RLOAD Primary Conductor Resistance RPRIMARY IP = +100A; TA = 25°C – Isolation Voltage VISO Pins 1-3 and 4-5; 60 Hz, 1 minute 3.0 PERFORMANCE CHARACTERISTICS, -20°C to +85°C, VCC = 5 V unless otherwise specified Propagation time tPROP IP = +50 A, TA = 25°C – Response time tRESPONSE IP = +50 A, TA = 25°C – Rise time tr IP = +50 A, TA = 25°C – – Frequency Bandwidth f –3 dB , TA = 25°C Over full range of IP , TA = 25°C – Sensitivity Sens Over full range of IP 36.5 Peak-to-peak, TA = 25°C, Noise VNOISE – no external filter Linearity ELIN Over full range of IP – Zero Current Output Voltage VOUT(Q) I = 0 A, TA = 25°C – I = 0 A, TA = 25°C –15 Electrical Offset Voltage VOE (Magnetic error not included) I=0A –25 Magnetic Offset Error IERROM I = 0 A, after excursion of 100 A – Over full range of I , T = 25°C – Total Output Error P A ETOT (Including all offsets) Over full range of IP – PERFORMANCE CHARACTERISTICS, -40°C to +150°C, VCC = 5 V unless otherwise specified Propagation time tPROP IP = +50 A, TA = 25°C – Response time tRESPONSE IP = +50 A, TA = 25°C – Rise time tr IP = +50 A, TA = 25°C – Frequency Bandwidth f –3 dB , TA = 25°C – Over full range of IP , TA = 25°C – Sensitivity Sens Over full range of IP 36 Peak-to-peak, TA = 25°C, – Noise VNOISE no external filter Linearity ELIN Over full range of IP – I = 0 A, TA = 25°C – Zero Current Output Voltage VOUT(Q) I = 0 A, TA = 25°C –15 Electrical Offset Voltage VOE (Magnetic error not included) I=0A –50 Magnetic Offset Error IERROM I = 0 A, after excursion of 100 A – Over full range of IP , TA = 25°C – Total Output Error ETOT (Including all offsets) Over full range of IP – Typ. – 5.0 8 1 – – 100 – Max. 100 5.5 10 2 10 – – – Units A V mA Ω nF kΩ μΩ kV 4 13 13 27 40 – – – – – – 41.5 μs μs μs kHz mV/A mV/A 65 – mV – 0.6 – – ±0.1 ±1 – ±2.8 – 15 25 ±0.30 – ±9.0 % V mV mV A % % 4 13 13 27 40 – – – – – – 42 μs μs μs kHz mV/A mV/A 65 – mV – 0.6 – – ±0.1 ±1 – ±2.8 – 15 50 ±0.30 – ±10.0 % V mV mV A % % Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 ACS755xCB-100 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor Definitions of Accuracy Characteristics Sensitivity (Sens). The change in device 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 amplifier gain (mV/G). The linear IC amplifier gain is programmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device. it nominally remains at 0.6. Variation in VIOUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim and thermal drift. Noise (VNOISE). The product of the linear IC amplifier gain (mV/G) and the noise floor for the Allegro Hall effect linear IC (≈1 G). The noise floor 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. Magnetic offset error (IERROM). The magnetic offset is due to the residual magnetism (remnant field) of the core material. The magnetic 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 flux concentrator. The larger magnetic offsets are observed at the lower operating temperatures. Linearity (ELIN). The degree to which the voltage output from the IC varies in direct proportion to the primary current through its full-scale amplitude. Nonlinearity in the output can be attributed to the saturation of the flux concentrator approaching the full-scale current. The following equation is used to derive the linearity: 100 1 – VIOUT_3/4 full-scale IP – VIOUT(Q) 3 VIOUT_1/4 full-scale IP – VIOUT(Q) Electrical offset voltage (VOE). The deviation of the device output from its ideal quiescent value due to nonmagnetic causes. Accuracy (ETOT). The accuracy represents the maximum deviation of the actual output from its ideal value. This is also known as the total output error. The accuracy is illustrated graphically in the output voltage versus current chart on the following page. Accuracy is divided into four areas: where 0 A at 25°C. Accuracy at the zero current flow at 25°C, without the effects of temperature. VIOUT_¼ full-scale IP (V) is the output voltage when the sampled current approximates 0.25 IP(max), and VIOUT_¾ full-scale IP (V) is the output voltage when the sampled current approximates 0.75 IP(max). 0 A over Δ temperature. Accuracy at the zero current flow including temperature effects. Quiescent output voltage (VIOUT(Q)). The output of the device when the primary current is zero. For a unipolar supply voltage, Full-scale current over Δ temperature. Accuracy at the fullscale current flow including temperature effects. Full-scale current at 25°C. Accuracy at the the full-scale current at 25°C, without the effects of temperature. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 ACS755xCB-100 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor Output Voltage versus Sampled Current Accuracy at 0 A and at Full-Scale Current Increasing VIOUT(V) Accuracy Over $Temp erature Accuracy 25°C Only Average VIOUT Accuracy Over $Temp erature Accuracy 25°C Only –IP (A) +IP (A) Full Scale IP(max) 0A Decreasing VIOUT(V) Definitions of Dynamic Response Characteristics Propagation delay (tPROP). The time required for the device output to reflect a change in the primary current signal. Propagation delay is attributed to inductive loading within the linear IC package, as well as in the inductive loop formed by the primary conductor geometry. Propagation delay can be considered as a fixed time offset and may be compensated. I (%) 90 Transducer Output 0 Propagation Time, tPROP I (%) 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 t Primary Current 90 Transducer Output 0 Response Time, tRESPONSE Rise time (tr). The time interval between a) when the device 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 device, 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. I (%) t Primary Current 90 Transducer Output 10 0 Rise Time, tr t Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 6 ACS755xCB-100 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor Step Response 50 A Excitation Signal, TA=25°C x100 Device Excitation Signal Output (mV) Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 7 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor ACS755xCB-100 Package CB, 5-pin package Leadform PFF 0.5 R1 R3 0.5 B 14.0±0.2 3.0±0.2 1.50±0.10 4.0±0.2 5 4 4 R2 21.4 3 1º±2° A 3.5±0.2 0.8 17.5±0.2 1.5 13.00±0.10 1.91 B Branded Face 4.40±0.10 PCB Layout Reference View 2.9±0.2 NNNNNNN TTT - AAA 5º±5° 1 2 +0.060 0.381 –0.030 3 10.00±0.10 3.5±0.2 LLLLLLL YYWW 1 7.00±0.10 C Standard Branding Reference View N = Device part number T = Temperature code A = Amperage range L = Lot number Y = Last two digits of year of manufacture W = Week of manufacture = Supplier emblem 0.51±0.10 1.9±0.2 For Reference Only; not for tooling use (reference DWG-9111, DWG-9110) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown Creepage distance, current terminals to signal pins: 7.25 mm Clearance distance, current terminals to signal pins: 7.25 mm Package mass: 4.63 g typical A Dambar removal intrusion B Perimeter through-holes recommended C Branding scale and appearance at supplier discretion Copyright ©2004-2010, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 8