Anaheim Integrated Circuit LSILS7362 User Manual
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Page 1
BRUSHLESS DC MOTOR COMMUTATOR/CONTROLLER DESCRIPTION: The LS7362 is a MOS integrated circuit designed to gener- ate 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 circuit responds to changes at the SENSE inputs, originating at the motor po- sition sensors, to provide electronic commutation of the motor windings. Pulse width modulation (PWM) of low-side drivers for motor speed control is...
Page 2
FORWARD/REVERSE (Pin 19) This pin acts to modify the input to output sequence such that when brought from high to low or low to high the direc- tion of rotation will reverse. An internal pull up resistor is provided at Pin 19 causing a logic one when left open. SENSE INPUTS (Pins 15, 16, 17) These inputs provide control of the output commutation sequence as shown in Table III. S1, S2, S3 originate in the position sensors of the motor and must sequence in cycle code order. Hall switch pull-up...
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MAXIMUM RATINGS: PARAMETER SYMBOL VALUE UNIT DC Supply Voltage Vss - VDD +35 V AnyInput Voltage to Vss VIN -30 to +0.5 V Storage Temperature TSTG -65 to +150 °C Operating Temperature TA -40 to +125 °C DC ELECTRICAL CHARACTERISTICS: (All Voltages Referenced to...
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6 12 Output Encoder 7 8 5 4 3 2 Q106Q105Q104 AL1BL2 L3 R13 R14 R15 Q6Q7Q8 Q3Q4Q5 BRAKE 11 Fractional Ohm ResistorTO OVERCURRENT ADJUSTMENT Vss Vss O4 O5 O6 O3 O2 O1 M O T O R FIGURE 1. BIPOLAR THREE PHASE OUTPUT DRIVER CIRCUITRY C Q107Q108Q109 R16R17R18 R4R5R6 Q101 Q102 Q103 R8 R7 R10 R9 R12 R11 R1 R2 R3 VM 6 12 Output Encoder 7 8 5 4 3 2 AL1BL2 L3Q6Q7Q8 Q3Q4Q5 BRAKE 11 Fractional Ohm ResistorTO OVERCURRENT ADJUSTMENT Vss Vss O4 O5 O6 O3 O2 O1 M O T O R FIGURE 2. POWER FET THREE PHASE OUTPUT DRIVER...
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Vss - +13V TRIP EXT. OSCILLATOR R6 R2C1 S1 R1 15 Vss C3 Vss R3 R4 R5 D1 C2 Vss R8 LS7362 FROM MOTOR POSITION SENSOR 14 C4 R7FIGURE 5 CLOSED-LOOP SPEED CONTROLLER A closed loop system can be configured by differentiating one of the motor position sense inputs and integrating only the negative pulses to form a DC voltage that is applied to the inverting input of an op-amp. The non-inverting input voltage is adjusted with a potentiometer until the resultant voltage at V TRIP causes the motor to run at...
Page 6
OUTPUT
DRIVERS
OUTPUT
ENCODER
INPUT
DECODER
R
S
SAWTOOTH
OSCILLATOR
-
+
+
POSITIVE
EDGE
DETECTOR
COMMUTATION
SEQUENCE
SELECT LOGIC
LOW-SIDE
DRIVERS
HIGH-SIDE
DRIVERS
5
6
8
11
VDD 18
VSS
GND
COMMON4
+V
1
20
19
15
16
17
9
10
12
13
14
»30kHz
CS1
CS2
FWD/REV
S1
S2
S3
BRAKE
ENABLE
OVERCURRENT
SENSE
V TRIP
0.001µF
33k
+V+V
FIGURE 6. LS7362 BLOCK DIAGRAM
R
R
+V
2
3
4
5
6
7
O3
O4
O5
O6
-
O1
O2
Q7362-101705-6