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LS7362 Datasheet(PDF) 1 Page - LSI Computer Systems |
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LS7362 Datasheet(HTML) 1 Page - LSI Computer Systems |
1 / 6 page BRUSHLESS DC MOTOR COMMUTATOR/CONTROLLER FEATURES: • Speed Control by Pulse Width Modulation (PWM) of low-side drivers only. • Open or closed loop motor speed control. • +5 to +28 Volt operation (Vss - VDD). • Externally selectable input to output code for 60°, 120°, 240°, or 300° electrical sensor spacing. • Three or four phase operation. • Analog Speed control. • Forward/Reverse control. • Output Enable control. • Positive Static Braking. • Overcurrent Sensing. • Six outputs drive switching bridge directly. DESCRIPTION: The LS7362 is a monolithic, ion implanted MOS circuit de- signed to generate the signals necessary to control a three phase or four phase brushless DC motor. It is the basic building block of a brushless DC motor controller. The cir- cuit responds to changes at the SENSE inputs, originating at the motor position sensors, to provide electronic com- mutation of the motor windings. Pulse width modulation (PWM) of low-side drivers for motor speed control is ac- complished through either the ENABLE input or through the V TRIP input (Analog Speed control) in conjunction with the OSCILLATOR input. Overcurrent circuitry is provided to protect the windings, associated drivers and power sup- ply. The LS7362 circuitry causes the external output driv- ers to switch off immediately upon sensing the overcurrent condition, and on again only when the overcurrent condi- tion disappears and the positive edge of either the EN- ABLE input or the sawtooth OSCILLATOR occurs. This lim- its the overcurrent sense cycling to the chopping rate of the ENABLE input or the sawtooth OSCILLATOR. A positive braking feature is provided to effect rapid deceleration. The LS7362 is designed for driving Bipolar and Field Effect Transistors. Because only low-side drivers are pulse width modulated, the LS7362 is ideally suited in situations where the integrated circuit interfaces with level converters to drive high voltage brushless DC motors. By pulse width modulating the low-side drivers only, the switch losses in the level conversion circuitry for the high-side drivers is minimized. Figure 1 indicates how the level conversion is accomplished. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 CS1 OUT 1 OUT 2 OUT 3 OUT 4 COMMON OUT 5 OUT 6 BRAKE ENABLE CS2 FORWARD/REVERSE V DD (-V) S3 S2 S1 OSCILLATOR V TRIP OVERCURRENT SENSE V SS (+V) CONNECTION DIAGRAM - TOP VIEW STANDARD 20 PIN PLASTIC DIP The COMMON, Pin 5, is tied to the positive supply rail and LS7362 Outputs 1, 2, and 3 are used to drive level converters Q101, Q102 and Q103 respectively. Only the motor top side drivers consisting of Q107, Q108 and Q109 which are connected to the motor power supply, VM, will be subject to the high speed switching currents that flow through the motor. The level converters are turned on and off at the slower commutation rate. INPUT/OUTPUT DESCRIPTION: COMMUTATION SELECTS (Pins 1, 20) These inputs are used to select the proper sequence of outputs based on the electrical separation of the motor position sensors. With both inputs low (logic zero), the sequence is adjusted for 60° electrical separation, with CS2 high and CS1 low 120° separation sequence is se- lected, with CS1 high and CS2 low 240° separation se- quence is selected and with CS1 and CS2 high the 300° separation sequence is selected. Note that in all cases the external output drivers are disabled for invalid SENSE input codes. Internal pull down resistors are pro- vided at Pins 1 and 20 causing a logic zero when these pins are left open. September 1999 7362-041100-1 LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 LS7362 • LS7362 (DIP); LS7362-S (SOIC); LS7362-TS (TSSOP) - See Connection Diagram UL ® A3800 |
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