3-Phase Brushless DC Motor Controller - Farnell element14

1 Vishay SiliconixSi9979 Document Number: 70012S-41209-Rev. E, Brushless DC Motor ControllerFEATURES Hall-Effect Commutation 60 or 120 Sensor Spacing Integral High-Side Drive for all N-ChannelMOSFET Bridges PWM Input Quadrature Selection Tachometer Output Reversible Braking Output Enable Control Cross Conduction Protection Current Limiting Undervoltage Lockout Internal Pull-Up ResistorsDESCRIPTIONThe Si9979 is a monolithic Brushless dc Motor Controller withintegral high-side drive circuitry. The Si9979 is configured toallow either 60 or 120 commutation sensor spacing.

2 Theinternal low-voltage regulator allows operation over a wideinput voltage range, 20 to 40 V Si9979 provides commutation from Hall-effect integral high-side drive, which utilizes combination boot-strap/charge pump supplies, allows implementation of an allN-Channel MOSFET 3-Phase bridge. PWM, direction,quadrature select, and braking inputs are included for controlalong with a tachometer output. Protection features includecross conduction protection, current limiting, and undervolt-age lockout. The FAULT output indicates when undervolt-age, over current, disable, or invalid sensor shutdown Si9979 is available in both standard and lead (Pb)-free48-pin SQFP packages and is specified to operate over thecommercial temperature range of 0 to 70 C (C suffix), andthe industrial temperature range of - 40 to 85 C (D suffix).

3 FUNCTIONAL BLOCK DIAGRAM INAINCBRKPWMTACHQSV+ LockoutVREF-+IS -IS+ LockoutBootstrap PumpSA35 GTB30 Bootstrap PumpSB31 CAPA36 CAPB32 GBA33 GBB29 VDD13-16, 21-24 GNDCAPCGTC26 Bootstrap PumpSC27 CAPC28 GBC25 One Shot37-41, 44-48 FAULT7 INBVDD360 Number: 70012S-41209-Rev. E, 21-Jun-04 Vishay SiliconixSi9979 Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operationof the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied.

4 Exposure to absolute maximumrating conditions for extended periods may affect device MAXIMUM RATINGS Parameter LimitsUnit Voltage on Pin 4250 VVoltage on Pins 1-4, 10, 11- V to VDD + VVoltage on Pins 5-9- to on Pins 26, 28, 30, 32, 34, 3660 Voltage on Pins 27, 31, 35- 2 to 50 Operating Temperature C Suffix0 to 70 CD Suffix- 40 to 85 Storage Temperature- 65 to 150 Junction Temperature (TJ)150 Power Dissipation (PD)C OPERATING RANGE Parameter LimitUnit V+ + 20 to 40 VDCRT10 k MinSPECIFICATIONS ParameterSymbol Test Conditions Unless Otherwise SpecifiedV+ = 20 to 40 V, IDD = 0 mALimitsUnit MinaTypbMaxaPowerSupply Voltage RangeV+2040 VLogic VoltageVDD- 20 mA IDD 0 CurrentI+ CurrentIDD- 20 Internal Inputs (INA, INB, INC, 60/120) Input CurrentIIHVIH = VDD10 ALow-State Input CurrentIILVIL = 0 V- 50 Logic Inputs (F/R, EN, QS, PWM, BRK)

5 Input CurrentIIHVIH = V10 ALow-State Input CurrentIILVIL = 0 V- 125 OutputsLow-Side Gate Drive, High Gate Drive, Low Side Gate Drive, High StateVGTHTA = 0 to 70 CC Suffix1618TA = - 40 to 85 CD Suffix1620 High-Side Gate Drive, Low VoltagedVCAPV+ = 40 V55 Document Number: 70012S-41209-Rev. E, SiliconixSi9979 Notes: a. The algebraic convention where by the most negative value is a minimum and the most positive a Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production The reference voltage is not available for external VCAP = (V+) + (VDD).Notes:L.

6 Any valid sensor combinationX. Don t ParameterSymbol Test Conditions Unless Otherwise SpecifiedV+ = 20 to 40 V, IDD = 0 mALimitsUnit MinaTypbMaxaOutputsLow-Side Switching, Rise TimetrLRisetime = 1 to 10 VFalltime = 10 to 1 VCL = 600 pF70nsLow-Side Switching, Fall TimetfL25 High-Side Switching, Rise TimetrH100 High-Side Switching, Fall TimetfH40 Break-Before-Make TimetBLH100tBHL300TA C H Output/FAULT OutputVOLIOL = C H Output PulsewidthtT300600nsProtectionLow-Side Undervoltage Undervoltage LockoutUVLHSA, B, C = 0 VVDD - LimitComparator Input Bias CurrentIIB- 5 AComparator Threshold VoltageVTHTA = 0 to 70 CC Suffix90100110mVTA = - 40 to 85 CD Suffix85100125 Common Mode VoltageVCM01 VOne Shot Pulse WidthtpRT = 10 k, CT = F81012 sRT = 10 k, CT = F80100120 COMMUTATION TRUTH TABLE InputsOutputsConditionsSensors(60 Spacing)Sensors(120 Spacing)

7 Top DriveBottom DriveFAULTINAINBINCINAINBINCENF/RBRKIS+G T-AGT-BGT-CGB AGB BGB C0000011100100010 11000001100100001 11100101100010001 11111101100010100 10111111100001100 10011011100001010 10000011000010100 11000001000001100 11100101000001010 11111101000100010 10111111000100001 10011011000010001 1 XXXXXX0X0X000000 0 DisableXXXXXX0X1X000111 0 Power DownLLLLLL1X10000111 1 BrakeLLLLLL1X11000111 0 Over I in BRKLLLLLL1X01000000 0 Over I1011111X0X000000 01011111X1X000111 00100001X0X000000 00100001X1X000111 Number: 70012S-41209-Rev. E, 21-Jun-04 Vishay SiliconixSi9979 PIN CONFIGURATION AND ORDERING INFORMATIONPIN DESCRIPTIONPins 1-3: INA, INB, INCINA, INB, and INC are the commutation sensor inputs, andare intended to be driven by open collector Hall effectswitches.

8 These inputs have internal pull up resistors tied toVDD, which eliminates the need for external pull up 4: 60/120 The 60/120 input allows the use of the Si9979 with either a60 or 120 commutation sensor spacing. An internal pull upresistor, which is tied to VDD, sets the default condition to 60 spacing. 120 spacing is selected by pulling this input 5: EN (Enable)A logic "1" on this input allows commutation of the is the default condition as this pin is pulled up this pin is pulled to ground, all gate drive outputs areturned 6: F/R (Forward/Reverse)A logic "1" on this input selects commutation for Motor rota-tion in the "forward" direction.

9 This is the default condition asthis pin is pulled up internally. When this pin is pulled toground, the commutation sensor logic levels are invertedinternally, causing reverse 7: QS (Quadrature Select)This input determines whether the bottom MOSFETs or bothbottom and top MOSFETs switch in response to the PWMsignal. A logic "1" on this input enables only the bottom MOS-FETs. This is the default condition as this pin is pulled upinternally. When this pin is pulled to ground, both the bottomand top MOSFETs are 8: PWMAn open collector (drain) or TTL compatible signal is appliedto this input to control the Motor speed.

10 The QS input deter-mines which MOSFETs are switched in response to thePWM signal. If no PWM signal is being used, this input is leftopen. It is pulled up internally, which allows the MOSFETs tofollow the commutation 45 44 43 42 41 40 39 38 3715 16 17 18 19 20 21 22 23 243635343332313029282726 Top ViewGNDGNDGNDGNDGNDV+GNDGNDGNDGNDGNDGNDG NDGNDGND48 47 GNDGND13 14 GNDGND25 VDDINAIS-IS+/CTRTRTORDERING INFORMATION StandardPart NumberLead (Pb)-free Part NumberTemperature RangePackageSi9979 CSSi9979CS-E30 to 70 CSQFP-48Si9979 DSSi9979DS-E3- 40 to 85 CNOTE: Si9979CS and Si9979DS are supplied in Number: 70012S-41209-Rev.