SMA6850M Series High Voltage 3-Phase Motor Drivers Features and Benefits ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Description Built-in pre-drive IC MOSFET power element CMOS compatible input (5 V) High-side gate driver using bootstrap circuit or floating power supply Built-in protection circuit for controlling power supply voltage drop Built-in overtemperature detection circuit (TD) Output of fault signal during operation of protection circuits Output current 1.5, 2, and 2.5 A Small SIP (SMA 24-pin) The SMA6850M inverter power module (IPM) series provides a robust, highly-integrated solution for optimally controlling 3-phase motor power inverter systems and variable speed control systems used in energy-conserving designs to drive motors of residential and commercial appliances. These ICs take 230 VAC input voltage, and up to 2.5 A (continuous) output current. They can withstand voltages of up to 500 V (MOSFET breakdown voltage). The SMA6850M power package includes an IC with all of the necessary power elements (six MOSFETs), pre-driver ICs (two), and flyback diodes (six), needed to configure the main circuit of an inverter. This enables the main circuit of the inverter to be configured with fewer external components than traditional designs. Packages: Power SIP Not to scale Leadform 2451 Applications include residential white goods (home applications) and commercial appliance motor control: • Air conditioner fan • Small ventilation fan • Dishwasher pump Leadform 2452 Functional Block Diagram VB 1 VB 2 VB3 VCC1 VBB 1 VBB 2 UVLO HIN1 HIN2 HIN3 Input Logic UVLO UVLO UVLO High Side Level Shift Driver COM1 U V W1 W2 VCC2 VREG LIN1 LIN2 LIN3 7.5V Reg. UVLO Input Logic Low Side Driver COM2 FO Figure 1. Driver block diagram 28610.20 Thermal Detect LS 3 LS 2 LS1 SMA6850M Series High Voltage 3-Phase Motor Drivers Selection Guide Output Current Part Number Packing MOSFET Breakdown Voltage, VDSS(min) (V) Continuous, IO(max) (A) Pulsed, IOP (max) (A) SMA6851M 18 pieces per tube 250 2 4 SMA6852M 18 pieces per tube 500 1.5 3 SMA6853M 18 pieces per tube 500 2.5 5 Absolute Maximum Ratings, valid at TA = 25°C Characteristic Symbol Remarks Rating SMA6851M SMA6852M VCC = 15 V, ID = 100 μA, VIN = 0 V Unit 250 V 500 V MOSFET Breakdown Voltage VDSS 500 V Logic Supply Voltage VCC Between VCC and COM 20 V Bootstrap Voltage VBS Between VB and HS (U,V, and W phases) 20 V SMA6851M 2 A SMA6852M 1.5 A SMA6853M 2.5 A SMA6851M 4 A 3 A 5 A SMA6853M Output Current, Continuous IO Output Current, Pulsed IOP SMA6852M PW ≤ 100 μs, duty cycle = 1% SMA6853M Input Voltage VIN Allowable Power Dissipation PD TC = 25°C –0.5 to 7 V 28 W Thermal Resistance (Junction to Case) RθJC All elements operating 4.46 °C/W Thermal Resistance (Junction to Ambient) RθJA All elements operating 31.25 °C/W Case Operating Temperature °C TCOP –20 to 100 Junction Temperature (MOSFET) TJ 150 °C Storage Temperature Tstg –40 to 150 °C Recommended Operating Conditions Characteristic Symbol Remarks SMA6851M Main Supply Voltage VBB SMA6852M Between VBB and LS SMA6853M Min. Typ. Max. Units – 150 200 V – 280 400 V – 280 400 V Logic Supply Voltage VCC 13.5 – 16.5 V Minimum Input Pulse TW(min) 0.5 – – μs tdead 1.5 – – μs TJ – – 125 °C Dead Time Junction Temperature Between VCC and COM All performance characteristics given are typical values for circuit or system baseline design only and are at the nominal operating voltage and an ambient temperature, TA, of 25°C, unless otherwise stated. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 2 SMA6850M Series High Voltage 3-Phase Motor Drivers Typical Application Diagram 1 2 3 SMA6850M 9 10 VB1 VB2 VB3 4 VCC1 HO 1 HS1 HVIC 8 7 6 5 24 HO 2 HS2 12 M HIN 1 HIN 2 HIN 3 HO 3 COM1 HS3 11 14 23 VCC 2 LO 1 17 MC U 20 19 18 LVIC LIN1 LIN2 LO 2 13 LIN3 LO 3 16 22 21 VREG 15 FO COM 2 15 V NOTE: ▪ All of the input pins are connected to GND with internal pull-down resistors rated at 100 kΩ, however, an external pull-down resistor may be required to secure stable condition of the inputs if high impedance conditions are applied to them. ▪ The external electrolytic capacitors should be placed as close to the IC as possible, in order to avoid malfunctions from external noise interference. Put a ceramic capacitor in parallel with the electrolytic capacitor if further reduction of noise susceptibility is necessary. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 3 SMA6850M Series High Voltage 3-Phase Motor Drivers ELECTRICAL CHARACTERISTICS, valid at TA=25°C, unless otherwise noted Characteristics Logic Supply Voltage Logic Supply Current Input Voltage Input Voltage Hysteresis Input Current Symbol Between VCC and COM Max Units 15 16.5 V VCC = 15 V, IREG = 0 A – 4 6 mA VCC = 15 V, output on – 2.0 2.5 V VIL VCC = 15 V, output off 1.0 1.5 – V VCC = 15 V – 0.5 – V IIH High side, VCC = 15 V, VIN = 5 V – 50 100 μA IIL Low side, VCC = 15 V, VIN = 0 V – – 2 μA VIhys VUVHhys VUVLL VUVLH VUVLhys Overtemperature Detection Threshold Temperature (activation and deactivation) Typ ICC VUVHL FO Terminal Output Voltage Min 13.5 VIH VUVHH Undervoltage Lock Out Conditions VCC VFOL VFOH High side, between VB and U, V, or W High side, hysteresis Low side, between VCC and COM Low side, hysteresis VCC = 15 V TDH TDL VCC = 15 V, no heatsink TDhys 9.0 10.0 11.0 V 9.5 10.5 11.5 V – 0.5 – V 10.0 11.0 12.0 V 10.5 11.5 12.5 V – 0.5 – V 0 – 1.0 V 4.0 – 5.5 V 135 150 165 °C 105 120 135 °C – 30 – °C Output Voltage for Regulator VREG IREG = 35 mA, TC = –20°C to 100°C 6.75 7.5 8.25 V Bootstrap Diode Leakage Current ILBD VR = 500 V – – 10 μA Bootstrap Diode Forward Voltage VFBD IF = 0.15 A – 1.1 1.3 V Bootstrap Diode Series Resistor RBD 17.6 22 26.4 Ω 250 – – V 500 – – V 500 – – V SMA6851M MOSFET Breakdown Voltage VDSS SMA6852M VCC = 15 V, ID = 100 μA, VIN = 0 V SMA6853M MOSFET Leakage Current MOSFET On State Resistance MOSFET Diode Forward Voltage IDSS RDS(on) VSD SMA6851M VCC = 15 V, VDS = 250 V, VIN = 0 V – – 100 μA SMA6852M VCC = 15 V, VDS = 500 V, VIN = 0 V – – 100 μA SMA6853M VCC = 15 V, VDS = 500 V, VIN = 0 V – – 100 μA SMA6851M VCC = 15 V, ID = 1 A, VIN = 5 V – 1.4 1.8 Ω SMA6852M VCC = 15 V, ID = 1 A, VIN = 5 V – 3.6 4.0 Ω SMA6853M VCC = 15 V, ID = 1.5 A, VIN = 5 V – 2.0 2.4 Ω SMA6851M VCC = 15 V, ISD = 1 A, VIN = 0 V – 1.1 1.5 V SMA6852M VCC = 15 V, ISD = 1 A, VIN = 0 V – 1.0 1.5 V SMA6853M VCC = 15 V, ISD = 1.5 A, VIN = 0 V – 1.0 1.5 V – 50 – ns ISD = 1.5 A, di / dt = 100 A/μs – 75 – ns – 75 – ns SMA6851M MOSFET Diode Recovery Time trr SMA6852M SMA6853M Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 4 SMA6850M Series High Voltage 3-Phase Motor Drivers SMA6851M SWITCHING CHARACTERISTICS, valid at TA=25°C, unless otherwise noted Characteristics Symbol Conditions Min Typ Max Units – 450 – ns – 100 – ns – 90 – ns tdH(off) – 350 – ns tfH – 20 – ns tdL(on) – 550 – ns trL – 110 – ns tdH(on) trH Switching Time, High Side Switching Time, Low Side trr VBB = 150 V, VCC = 15 V, ID = 2 A, 0 V ≤ VIN ≤ 5 V – 90 – ns tdL(off) – 360 – ns tfL – 20 – ns Min Typ Max Units – 550 – ns – 100 – ns – 120 – ns tdH(off) – 420 – ns tfH – 30 – ns tdL(on) – 570 – ns trL – 100 – ns trr VBB = 150 V, VCC = 15 V, ID = 2 A, 0 V ≤ VIN ≤ 5 V SMA6852M SWITCHING CHARACTERISTICS, valid at TA=25°C, unless otherwise noted Characteristics Symbol Conditions tdH(on) trH Switching Time, High Side Switching Time, Low Side trr trr VBB = 300 V, VCC = 15 V, ID = 1.5 A, 0 V ≤ VIN ≤ 5 V – 120 – ns tdL(off) VBB = 300 V, VCC = 15 V, ID = 1.5 A, 0 V ≤ VIN ≤ 5 V – 450 – ns tfL – 30 – ns Min Typ Max Units tdH(on) – 640 – ns trH – 100 – ns SMA6853M SWITCHING CHARACTERISTICS, valid at TA=25°C, unless otherwise noted Characteristics Switching Time, High Side Switching Time, Low Side Symbol Conditions – 150 – ns tdH(off) – 520 – ns tfH – 30 – ns tdL(on) – 650 – ns trL – 100 – ns trr trr VBB = 300 V, VCC = 15 V, ID = 2.5 A, 0 V ≤ VIN ≤ 5 V – 150 – ns tdL(off) VBB = 300 V, VCC = 15 V, ID = 2.5 A, 0 V ≤ VIN ≤ 5 V – 580 – ns tfL – 30 – ns Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 5 SMA6850M Series High Voltage 3-Phase Motor Drivers 5V HIN 2 kΩ LIN 100 kΩ COM HINx and LINx Terminals Internal Equivalent Circuit 5V 100 Ω 200 kΩ FO COM FO Terminal Internal Equivalent Circuit Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 6 SMA6850M Series High Voltage 3-Phase Motor Drivers High Side Driver Input/Output Timing Diagrams HIN VUVHH VB-HS VUVHL UVLO Release VCC1 VUVLL VUVLH HO Low Side Driver Input/Output Timing Diagrams LIN VCC VUVHH VUVHL UVLO Release LO FO TDH TDL TJ Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 7 SMA6850M Series High Voltage 3-Phase Motor Drivers Pin-out Diagrams Leadform 2451 1 3 2 5 4 7 6 9 8 11 10 13 12 15 14 17 16 19 18 21 20 23 22 Leadform 2452 24 1 3 2 5 4 7 6 9 8 11 10 13 12 15 14 17 16 19 18 21 20 23 22 24 Chamfer Side Chamfer on Opposite Side Terminal List Table Number 1 Name VB1 Function High side bootstrap terminal (U phase) 2 VB2 High side bootstrap terminal (V phase) 3 VB3 High side bootstrap terminal (W phase) 4 VCC1 High side logic supply voltage 5 COM1 High side logic GND terminal 6 HIN3 High side input terminal (W phase) 7 HIN2 High side input terminal (V phase) 8 HIN1 High side input terminal (U phase) 9 VBB1 Main supply voltage 1 (connect to VBB2 externally) 10 VBB2 Main supply voltage 2 (connect to VBB1 externally) 11 W1 Output of W phase (connect to W2 externally) 12 V 13 LS2 Source terminal of V phase Output of V phase 14 W2 Output of W phase (connect to W1 externally) 15 LS3 Source terminal of W phase 16 VREG Internal regulator output terminal 17 LS1 Source terminal of U phase 18 LIN3 Low side input terminal (W phase) 19 LIN2 Low side input terminal (V phase) 20 LIN1 Low side input terminal (U phase) 21 COM2 22 FO 23 VCC2 24 U Low side GND terminal Overtemperature detection fault-signal output terminal Low side logic supply voltage Output of U phase Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 8 SMA6850M Series High Voltage 3-Phase Motor Drivers Package Outline Drawing Leadform 2451 Dual rows, 24 alternating pins; pins bent 90° for horizontal case mounting; pin #1 in outer row Gate protrusion 31.3 ±0.2 31 ±0.2 4 ±0.2 Gate protrusion 1.2 ±0.1 BSC 10.2 ±0.2 Branding Area 3 ±0.5 BSC 2.2 ±0.7 BSC R1 REF 4.4 REF +0.15 – 0.05 C 0.7 View A 1 2 3 4 5 6 7 8 9 10 11 12 13 1.27 ±0.1 A 1.27 ±0.6 B 0.6 +0.15 – 0.05 14 15 16 17 18 19 20 21 22 23 2.2 ±0.7 BSC 24 0.7 MAX A Measured at pin exit from case B Measured at pin tips C Maximum dambar protrusion 0.55 +0.2 – 0.1 Leadform: 2451 Terminal core material: Cu Terminal plating: Ni and solder (Sn 97.5%, Ag 2.5%) plating Case material: Epoxy resin 0.7 MAX Deflection at pin bend View A Dimensions in millimeters Branding codes (exact appearance at manufacturer discretion): 1st line, lot: YMDD# Where: Y is the last digit of the year of manufacture M is the month (1 to 9, O, N, D) DD is the date # is the tracking letter 2nd line, type: SMA685xM Leadframe plating Pb-free. Device composition complies with the RoHS directive. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 9 SMA6850M Series High Voltage 3-Phase Motor Drivers Package Outline Drawing Leadform 2452 Dual rows, 24 alternating pins; vertical case mounting; pin #1 opposite chamfer side Gate protrusion 31.3 ±0.2 31 ±0.2 4 ±0.2 Gate protrusion 1.2 ±0.1 BSC 10.2 ±0.2 Branding Area 5 ±0.5 9.5 +0.7 – 0.5 R1 REF 0.5 +0.15 – 0.05 4.5 REF 1.27 ±0.5 A 4.5 ±0.5 0.6 +0.15 – 0.05 View A 2 1 A 4 3 6 5 8 7 Measured at pin tips 10 9 12 11 14 13 16 15 18 17 20 19 22 21 24 23 0.7 MAX Leadform: 2452 Terminal core material: Cu Terminal plating: Ni Recommended attachment: Solder dip (Sn-Ag-Cu) 0.7 MAX Deflection at pin bend View A Dimensions in millimeters Branding codes (exact appearance at manufacturer discretion): 1st line, lot: YMDD# Where: Y is the last digit of the year of manufacture M is the month (1 to 9, O, N, D) DD is the date # is the tracking letter 2nd line, type: SMA685xM Leadframe plating Pb-free. Device composition complies with the RoHS directive. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 10 SMA6850M Series High Voltage 3-Phase Motor Drivers Packing Specification Leadform 2451 Dimensions in millimeters 23.8 . 590 11.5 X Tube material: PVC Maximum 18 pieces per tube (pins aligned along X direction) Rubber plug each end 130 610 185 Z Y Maximum 15 tubes in Y direction Maximum 4 layers in Z direction Maximum pieces per carton: 18 pieces per tube 15 tubes per layer x 4 layers of tubes 1080 pieces per carton Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 11 SMA6850M Series High Voltage 3-Phase Motor Drivers Packing Specification Leadform 2452 Dimensions in millimeters 24.9 590 Tube material: PVC Maximum 18 pieces per tube (pins aligned along X direction) Rubber plug each end 12.2 X 130 610 Carton material: corrugated cardboard 185 Z Y Maximum 14 tubes in Y direction Maximum 4 tubes in Z direction Maximum pieces per carton: 18 pieces per tube 14 tubes per layer x 4 layers of tubes 1008 pieces per carton Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 12 SMA6850M Series High Voltage 3-Phase Motor Drivers WARNING — These devices are designed to be operated at lethal voltages and energy levels. Circuit designs that embody these components must conform with applicable safety requirements. Precautions must be taken to prevent accidental contact with power-line potentials. Do not connect grounded test equipment. The use of an isolation transformer is recommended during circuit development and breadboarding. Because reliability can be affected adversely by improper storage environments and handling methods, please observe the following cautions. Cautions for Storage • Ensure that storage conditions comply with the standard temperature (5°C to 35°C) and the standard relative humidity (around 40 to 75%); avoid storage locations that experience extreme changes in temperature or humidity. • Avoid locations where dust or harmful gases are present and avoid direct sunlight. • Reinspect for rust on leads and solderability of products that have been stored for a long time. Cautions for Testing and Handling When tests are carried out during inspection testing and other standard test periods, protect the products from power surges from the testing device, shorts between adjacent products, and shorts to the heatsink. Remarks About Using Silicone Grease with a Heatsink • When silicone grease is used in mounting this product to a heatsink, it shall be applied evenly and thinly. If more silicone grease than required is applied, it may produce stress. • Volatile-type silicone greases may permeate the product and produce cracks after long periods of time, resulting in reduced heat radiation effect, and possibly shortening the lifetime of the product. • Our recommended silicone greases for heat radiation purposes, which will not cause any adverse effect on the product life, are indicated in the following table: Type Suppliers G746 Shin-Etsu Chemical Co., Ltd. YG6260 Momentive Performance Materials, Inc. SC102 Dow Corning Toray Silicone Co., Ltd. Soldering • When soldering the products, please be sure to minimize the working time, within the following limits: 260±5°C 10 s 380±5°C 5 s • Soldering iron should be at a distance of at least 1.5 mm from the body of the products Electrostatic Discharge • When handling the products, operator must be grounded. Grounded wrist straps worn should have at least 1 MΩ of resistance to ground to prevent shock hazard. • Workbenches where the products are handled should be grounded and be provided with conductive table and floor mats. • When using measuring equipment such as a curve tracer, the equipment should be grounded. • When soldering the products, the head of soldering irons or the solder bath must be grounded in other to prevent leak voltages generated by them from being applied to the products. • The products should always be stored and transported in our shipping containers or conductive containers, or be wrapped in aluminum foil. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 13 SMA6850M Series High Voltage 3-Phase Motor Drivers The products described herein are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc. Sanken and Allegro reserve 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. Therefore, the user is cautioned to verify that the information in this publication is current before placing any order. When using the products described herein, the applicability and suitability of such products for the intended purpose shall be reviewed at the users responsibility. Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a certain rate is inevitable. Users of Sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to society due to device failure or malfunction. Sanken products listed in this publication are designed and intended for use as components in general-purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). Their use in any application requiring radiation hardness assurance (e.g., aerospace equipment) is not supported. When considering the use of Sanken products in applications where higher reliability is required (transportation equipment and its control systems or equipment, fire- or burglar-alarm systems, various safety devices, etc.), contact a company sales representative to discuss and obtain written confirmation of your specifications. The use of Sanken products without the written consent of Sanken in applications where extremely high reliability is required (aerospace equipment, nuclear power-control stations, life-support systems, etc.) is strictly prohibited. The information included herein is believed to be accurate and reliable. Application and operation examples described in this publication are given for reference only and Sanken and Allegro assume no responsibility for any infringement of industrial property rights, intellectual property rights, or any other rights of Sanken or Allegro or any third party that may result from its use. The contents in this document must not be transcribed or copied without Sanken’s written consent. Copyright © 2008-2010 Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 14 SMA6850M Series High Voltage 3-Phase Motor Drivers Worldwide Contacts Asia-Pacific China Sanken Electric Hong Kong Co., Ltd. Suite 1026, Ocean Centre Canton Road, Tsimshatsui Kowloon, Hong Kong Tel: 852-2735-5262, Fax: 852-2735-5494 Sanken Electric (Shanghai) Co., Ltd. Room 3202, Maxdo Centre Xingyi Road 8, Changning District Shanghai, China Tel: 86-21-5208-1177, Fax: 86-21-5208-1757 Room 1013, Xinhua Insurance Building Mintian Road, Futian District Shenzhen City, Guangdong, China Tel: 86-755-3391-9356/9358, Fax: 86-755-3391-9368 Room 1801, 18th Floor 88 Jung Shiau East Road, Sec. 2 Taipei 100, Taiwan R.O.C. Tel: 886-2-2356-8161, Fax: 886-2-2356-8261 Japan Sanken Electric Co., Ltd. Overseas Sales Headquarters Metropolitan Plaza Building 1-11-1 Nishi-Ikebukuro, Toshima-ku Tokyo 171-0021, Japan Tel: 81-3-3986-6164, Fax: 81-3-3986-8637 Samsung Life Yeouido Building 16F 23-10, Yeouido-Dong, Yeongdeungpo-gu Seoul 150-734, Korea Tel: 82-2-714-3700, Fax: 82-2-3272-2145 Singapore Sanken Electric Singapore Pte. Ltd. 150 Beach Road, #14-03 The Gateway West Singapore 189720 Tel: 65-6291-4755, Fax: 65-6297-1744 Sanken Electric (Shanghai) Co., Ltd. Shenzhen Office Taiwan Sanken Electric Co., Ltd. Korea Sanken Electric Korea Co., Ltd. Europe Sanken Power Systems (UK) Limited Pencoed Technology Park Pencoed, Bridgend CF35 5HY, United Kingdom Tel: 44-1656-869-100, Fax: 44-1656-869-162 North America United States Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01606, U.S.A. Tel: 1-508-853-5000, Fax: 1-508-853-7895 Allegro MicroSystems, Inc. 14 Hughes Street, Suite B105 Irvine, California 92618, U.S.A. Tel: 1-949-460-2003, Fax: 1-949-460-7837 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 15