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A4960 Dataheets PDF



Part Number A4960
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description Sensorless BLDC Controller
Datasheet A4960 DatasheetA4960 Datasheet (PDF)

A4960 Automotive, Sensorless BLDC Controller Features and Benefits • 3-phase BLDC sensorless start-up and commutation • Gate drive for N-channel MOSFETs • Integrated PWM current limit • 7 to 50 V supply voltage operating range • Compatible with 3.3 V and 5 V logic • Cross-conduction protection with adjustable dead time • Charge pump for low supply voltage operation • Extensive diagnostics output • Low current sleep mode Applications: • Hydraulic pump • Fuel pump • Urea pump • Blower fan Package.

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A4960 Automotive, Sensorless BLDC Controller Features and Benefits • 3-phase BLDC sensorless start-up and commutation • Gate drive for N-channel MOSFETs • Integrated PWM current limit • 7 to 50 V supply voltage operating range • Compatible with 3.3 V and 5 V logic • Cross-conduction protection with adjustable dead time • Charge pump for low supply voltage operation • Extensive diagnostics output • Low current sleep mode Applications: • Hydraulic pump • Fuel pump • Urea pump • Blower fan Package: 32-pin LQFP with exposed thermal pad (suffix JP) Not to scale Description The A4960 is a three-phase, sensorless, brushless DC (BLDC) motor controller for use with external N-channel power MOSFETs and is specifically designed for automotive applications. The motor is driven using block commutation (trapezoidal drive) where phase commutation is determined, without the need for independent position sensors, by monitoring the motor back-EMF. A programmable motor start-up scheme allows the A4960 to be adjusted for a wide range of motor and load combinations. An external bootstrap capacitor is used to provide the above battery supply voltage required for N-channel MOSFETs. An automatic internal bootstrap charge management scheme ensures that the bootstrap capacitor is always sufficiently charged for safe operation of the power MOSFETs. The power MOSFETs are protected from shoot-through by integrated crossover control and adjustable dead time. Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults and can be configured to protect the power MOSFETs under most short circuit conditions. Detailed diagnostics are available as a serial data word. The A4960 is supplied in a 32-pin LQFP with exposed pad for enhanced thermal dissipation (suffix JP). This package is lead (Pb) free, with 100% matte-tin leadframe plating (suffix –T). VBAT A8450 Regulator Typical Application VBAT Microcontroller SPI PWM TACHO RESET FAULT A4960 3-Phase BLDC Motor A4960A-DS, Rev. 3 MCO-0000174 April 25, 2019 A4960 Automotive, Sensorless BLDC Controller Selection Guide Part Number Packing1 A4960KJPTR-A-T2 1500 pieces per 13-in. reel 1Contact Allegro™ for additional packing options 2The “-A” suffix indicates this is an enhanced EMC performance version. Absolute Maximum Ratings1,2 Characteristic Load Supply Voltage Logic Supply Voltage Terminal VREG Terminal CP1 Symbol VBB VDD VREG VCP1 Notes Terminal CP2 VCP2 Logic Inputs Logic Outputs Terminal DIAG Terminal VBRG Terminals CA, CB, CC VI VO VDIAG VBRG VCx Terminals STRN, SCK, SDI, PWM Terminal RESETN – can be pulled to VBB with >22 kΩ Terminals SDO, TACHO Terminals GHA, GHB, GHC VGHx Terminals SA, SB, SC VSx Terminals GLA, GLB, GLC Terminal LSS Terminal REF Terminals CSP, CSM Terminal AGND VGLx VLSS VREF VCSx Connect directly to GND Ambient Operating Temperature Range TA Temperature Range K; limited by power dissipation Maximum Continuous Junction Temperature TJ(max) Transient Junction Temperature Over temperature event not exceeding 10 s, TJt lifetime duration not exceeding 10 hours, guaranteed by design characterization. Storage Temperature Range Tstg 1With respect to GND. Ratings apply when no other circuit operating constraints are present. 2Small “x” in pin names and symbols indicates a variable sequence character. Rating –0.3 to 50 –0.3 to 6 –0.3 to 16 –0.3 to 16 VCP1 – 0.3 to VREG + 0.3 –0.3 to 6 –0.3 to 6 –0.3 to VDD + 0.3 –0.3 to VDD + 0.3 –5 to 55 –0.3 to VREG + 50 VCX – 16 to VCX + 0.3 VCX – 16 to VCX + 0.3 VREG – 16 to 18 VREG – 16 to 18 –0.3 to 6.5 –0.3 to 1 Unit V V V V V V V V V V V V V V V V V –40 to 150 150 175 –55 to 150 °C °C °C °C Thermal Characteristics may require derating at maximum conditions, see application information Characteristic Symbol Test Conditions* Value Package Thermal Resistance, Junction to Ambient On 4-layer PCB based on JEDEC standard RθJA On 2-layer PCB with 3 in.2 copper each side 23 44 Package Thermal Resistance, Junction to Pad RθJP 2 *Additional thermal information available on the Allegro website Unit ºC/W ºC/W ºC/W Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 A4960 Automotive, Sensorless BLDC Controller Table of Contents Specifications Pin-out Diagram and Terminal List Functional Block Diagram Electrical Characteristics Table Timing Diagrams Operation Timing Diagrams Functional Description Functional Description Input and Output Terminal Functions Motor Drive System Rotor position sensing using motor BEMF Commutation Blank Time BEMF Window BEMF Hysteresis Start-up Motor control Phase advance Power Supplies Gate Drives Gate drive voltage regulation Bootstrap charge management Low-side gate drive High-side gate drive Dead Time Sleep Mode and RESETN 2 4 5 6 10 10 12 12 12 13 13 14.


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