3-Phase Brushless DC Motor Controller

Transcription

1 -Phase rushless D Motor ontroller Si FETURES Hall-Effect ommutation 0 or 0 Sensor Spacing Integral High-Side Drive for all N-hannel MOSFET ridges PWM Input Quadrature Selection Tachometer Output Reversible raking Output Enable ontrol ross onduction Protection urrent Limiting Undervoltage Lockout Internal Pull-Up Resistors DESRIPTION The Si is a monolithic brushless dc motor controller with integral high-side drive circuitry. The Si is configured to allow either 0 or 0 commutation sensor spacing. The internal low-voltage regulator allows operation over a wide input voltage range, 0- to 0-V dc. quadrature select, and braking inputs are included for control along with a tachometer output. Protection features include cross conduction protection, current limiting, and undervoltage lockout. The output indicates when undervoltage, over current, disable, or invalid sensor shutdown has occurred. The Si provides commutation from Hall-effect sensors. The integral high-side drive, which utilizes combination bootstrap/charge pump supplies, allows implementation of an all n-channel MOSFET -phase bridge. PWM, direction, The Si is available in both standard and lead (Pb)-free -pin SQFP packages and is specified to operate over the commercial temperature range of 0 to 0 ( suffix), and the industrial temperature range of 0 to (D suffix). FUNTIONL LOK DIGRM Low-Voltage Regulator Low-Side U.V. Lockout P P P High-Side U.V. Lockout ootstrap Reg. harge Pump ootstrap Reg. harge Pump 0 P S P IN 0/0 QS PWM 0 Input Logic ootstrap Reg. harge Pump -, - -, - P GT S G G G / T One Shot + 0

2 SOLUTE MXIMUM RTINGS Voltage on Pin V Voltage on Pins, 0, V to + 0. V Voltage on Pins V to. V Voltage on Pins,, 0,,, V Voltage on Pins,, to 0 V Operating Temperature Suffix to 0 D Suffix to Storage Temperature to 0 Junction Temperature (T J ) Power Dissipation (P D ) Suffix W D Suffix W REOMMDED OPERTING RNGE to 0 V D k Min SPEIFITIONS Test onditions Unless Otherwise Specified Limits Parameter Symbol = 0 to 0 V, I DD = 0 m Min a Typ b Max a Unit Power Supply Voltage Range 0 0 Logic Voltage 0 m I DD 0 m.. V Supply urrent I+. Logic urrent I DD 0 m Internal Reference d. V ommutation Inputs (,, IN, 0/0) High-State V IH.0 Low-State V IL.0 V High-State Input urrent I IH V IH = 0 Low-State Input urrent I IL V IL = 0 V 0 Logic Inputs (,, QS, PWM, ) High-State V IH.0 Low-State V IL 0. V High-State Input urrent I IH V IH =. V 0 Low-State Input urrent I IL V IL = 0 V Outputs Low-Side Gate Drive, High State V GH. Low-Side Gate Drive, Low State V GL 0. High-Side Gate Drive, High State V GTH T = 0 to D Suffix 0 V T = 0 to 0 Suffix High-Side Gate Drive, Low State V GTL 0. apacitor Voltage d V P = 0 V Low-Side Switching, Rise Time t rl 0 Low-Side Switching, Fall Time t fl Risetime = to 0 V Falltime = 0 to V High-Side Switching, Rise Time t rh 00 L = 00 pf ns High-Side Switching, Fall Time t fh 0 t LH 00 reak-efore-make efore Time t HL 00 Output/ Output V OL I OL =.0 m V Output Pulsewidth t T ns

3 SPEIFITIONS Parameter Symbol Protection Test onditions Unless Otherwise Specified Limits = 0 to 0 V, I DD = 0 m Min a Typ b Max a Unit Low-Side Undervoltage Lockout UVLL. Low-Side Hysteresis V H 0. V High-Side Undervoltage Lockout UVLH S,, = 0 V. urrent Limit omparator Input ias urrent I I omparator Threshold Voltage V TH T = 0 to D Suffix 00 mv T = 0 to 0 Suffix ommon Mode Voltage V M 0 V = 0 k, T = 0.00 F 0 One Shot Pulse Width t p = 0 k, T = 0.0 F s Notes a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum. b. Typical values are for DESIGN ID ONLY, not guaranteed nor subject to production testing. c. The reference voltage is not available for external use. d. V P = () + ( ). OMMUTTION TRUTH TLE Sensors (0 Spacing) Inputs Outputs onditions Sensors (0 Spacing) IN IN R K p Drive GT- GT- GT- ottom Drive G G G X X X X X X 0 X 0 X Disable X X X X X X 0 X X Power Down L L L L L L X rake L L L L L L X Over I in L L L L L L X Over I 0 X 0 X X X X 0 X X X Notes: L. ny valid sensor combination X. Don t care

4 PIN ONFIGURTION ND ORDERING INFORMTION SQFP- 0 IN 0/0 QS PWM 0 0 P S G P G P S GT G 0 / T ORDERING INFORMTION Standard Part Number Lead (Pb)-Free Part Number Temperature Range SiS SiS E 0 to 0 SiDS SiDS E 0 to NOTE: SiS and SiDS are supplied in trays. Package SQFP- p View PIN DESRIPTION Pins :,, IN,, and IN are the commutation sensor inputs, and are intended to be driven by open collector Hall effect switches. These inputs have internal pull up resistors tied to, which eliminates the need for external pull up resistors. Pin : 0/0 The 0/0 input allows the use of the Si with either a 0 or 0 commutation sensor spacing. n internal pull up resistor, which is tied to, sets the default condition to 0 spacing. 0 spacing is selected by pulling this input to ground. Pin : (Enable) logic on this input allows commutation of the motor. This is the default condition as this pin is pulled up internally. When this pin is pulled to ground, all gate drive outputs are turned off. Pin : (Forward/Reverse) logic on this input selects commutation for motor rotation in the forward direction. This is the default condition as this pin is pulled up internally. When this pin is pulled to ground, the commutation sensor logic levels are inverted internally, causing reverse rotation. Pin : QS (Quadrature Select) This input determines whether the bottom MOSFETs or both bottom and top MOSFETs switch in response to the PWM signal. logic on this input enables only the bottom MOSFETs. This is the default condition as this pin is pulled up internally. When this pin is pulled to ground, both the bottom and top MOSFETs are enabled. Pin : PWM n open collector (drain) or TTL compatible signal is applied to this input to control the motor speed. The QS input determines which MOSFETs are switched in response to the PWM signal. If no PWM signal is being used, this input is left open. It is pulled up internally, which allows the MOSFETs to follow the commutation sequence.

5 PIN DESRIPTION (ONT D) Pin : With this input at logic, the top MOSFETs are turned off and the bottom MOSFETs are turned on, shorting the motor windings together. This provides a braking torque which is dependent on the motor speed. This is the default condition as this pin is pulled up internally. When this pin is pulled to ground, the MOSFETs are allowed to follow the commutation sequence. Pin 0: This output provides a minimum 00-nanosecond output pulse for every commutation sensor transition, yielding a pulse per electrical revolution tachometer signal. This output is open drain. Pin : The output switches low to indicate that at least one of the following conditions exists, controller disable (), undervoltage lockout, invalid commutation sensor code shutdown, or overcurrent shutdown. This output is open drain. Pin : / T The junction of the current limit one shot timing resistor and capacitor is connected to this pin. This one-shot is triggered by the current limit comparator when an overcurrent condition exists. This action turns off all the gate drives for the period defined by and T, thus stopping the flow of current. Pin : One side of the current limit one shot timing resistor is connected to this pin. Pin : This is the sensing input of the current limit comparator and should be connected to the positive side of the current sense resistor. When the voltage across the current sense resistor exceeds 00 mv, the comparator switches and triggers the current limit one-shot. The one-shot turns off all the gate drives for the period defined by and T, thus stopping the flow of current. If the overcurrent condition remains after the shutdown period, the gate drives will be held off until the overcurrent condition no longer exists. Pin 0: This pin is the ground reference for the current limit comparator. It should be connected directly to the ground side of the current sense resistor to enhance noise immunity. Pins :,,, These pins are the return path for both the logic and gate drive circuits. lso, they serve to conduct heat out of the package, into the circuit board. Pin : G This is the gate drive output for the bottom MOSFET in Phase. Pin : GT This is the gate drive output for the top MOSFET in Phase. Pin : S This pin is negative supply of the high-side drive circuitry. s such, it is the connection for the negative side of the bootstrap capacitor, the top MOSFET Source, the bottom MOSFET Drain, and the Phase output. Pin : P This pin is the positive supply of the high-side circuitry. The bootstrap capacitor for Phase is connected between this pin and S. Pin : G This is the gate drive output for the bottom MOSFET in Phase. Pin 0: This is the gate drive output for the top MOSFET in Phase. Pin : This pin is negative supply of the high-side drive circuitry. s such, it is the connection for the negative side of the bootstrap capacitor, the top MOSFET Source, the bottom MOSFET Drain, and the Phase output. Pin : P This pin is the positive supply of the high-side circuitry. The bootstrap capacitor for Phase is connected between this pin and S. Pin : G This is the gate drive output for the bottom MOSFET in Phase.

6 PIN DESRIPTION (ONT D) Pin : This is the gate drive output for the top MOSFET in Phase. Pin : S This pin is negative supply of the high-side drive circuitry. s such, it is the connection for the negative side of the bootstrap capacitor, the top MOSFET Source, the bottom MOSFET Drain, and the Phase output. Pin : P This pin is the positive supply of the high-side circuitry. The bootstrap capacitor for Phase is connected between this pin and S. Pin : The supply voltage for the Si is connected between this pin and ground. The internal logic and high-side supply voltages are derived from. Pin : is the internal logic and gate drive voltage. It is necessary to connect a capacitor between this pin and ground to insure that the current surges seen at the turn on of the bottom MOSFETs does not trip the undervoltage lockout circuitry. PPLITION IRUITS LITTLE FOOT Si Q Q Q ommutation Sensors PWM IN F T 0 IN 0/0 QS PWM / T S P P GT S P G G G 0 0 R Q Q Q Motor Windings,, R S FIGURE. Three-Phase rushless D Motor ontroller

7 PPLITION IRUITS LITTLE FOOT Si Q Q ommutation Sensor PWM IN F T IN 0/0 0 QS PWM R T / T,, S P P GT S P G G G 0 0 R R S Q Q Motor Windings Notes: ) If driving single phase LD, tie,, and IN together and drive with single hall. ) If it is being used as an H- bridge controller, tie,, and IN to. Use input to change active diagonal pair of MOSFETs. ) There is no output when connected in this configuration. FIGURE. Single H-ridge ontroller LITTLE FOOT LK M0 0 P 0 P MR PWM IN F T 0 IN 0/0 Q PWM S / T Si S P P GT S P G G G,, 0 0 R R S Q Q Q Q Q Q Motor Windings FIGURE. Three-Phase Motor ontroller

8 PPLITION IRUITS F Si = V E FIGURE. External Regulator

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