ls7260 LSI Computer Systems, Inc., ls7260 Datasheet

ls7260

Manufacturer Part Number

ls7260

Description

Brushless Dc Motor Commutator/controller

Manufacturer

LSI Computer Systems, Inc.

Datasheet

1.LS7260.pdf (7 pages)

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ls7260-S

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7260-101705-1

DESCRIPTION:

The LS7260/LS7262 are MOS integrated circuits de-

signed to generate the signals necessary to control a

three phase or four phase brushless DC motor. They

are the basic building blocks of a brushless DC motor

controller.

SENSE inputs, originating at the motor position sensors,

to provide electronic commutation of the motor wind-

ings. Pulse Width Modulation of outputs for motor speed

control is accomplished through either the ENABLE in-

put or through the Analog input (V TRIP) in conjunction

with the OSCILLATOR input. Overcurrent circuitry is

provided to protect the windings, associated drivers and

power supply. The overcurrent circuitry causes the ex-

ternal output drivers to switch off immediately upon

sensing the overcurrent condition and on again only

when the overcurrent condition disappears and the pos-

itive edge of either the ENABLE input or the sawtooth

OSCILLATOR occurs. This limits 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 de-

celeration. While the LS7262 is designed for driving

NPN and PNP transistors (See Fig. 2), the LS7260 is

designed to drive both NMOS and PMOS Power FETs

and develops a full 12V drive for both the N-Channel

and P-Channel devices (See Fig. 1) when using a 12V

power supply.

FEATURES:

•

U L

A3800

Direct drive of PNP and NPN transistors (LS7262)

Open or closed loop motor speed control.

+5V to +28V operation (Vss - V

Externally selectable input to output code for 60°,

120°, 240°, or 300° electrical sensor spacing.

Analog Speed control

Direction control

Output Enable control

Positive Static Braking

Overcurrent Sensing

LS7260, LS7262 (DIP); LS7260-S, LS7262-S (SOIC);

Direct drive of P-Channel and N-Channel FETs (LS7260)

Six outputs drive power switching bridge directly

Three or four phase operation

LS7260-TS, LS7262-TS (TSSOP) - See Connection Diag.

BRUSHLESS DC MOTOR COMMUTATOR/CONTROLLER

LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747

The circuits respond to changes at the

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.

See Table 3. Note that in all cases the external output drivers

are disabled for invalid SENSE input codes. Internal pull down

resistors are provided at Pins 1 and 20 causing a logic zero

when these pins are left open.

FORWARD/REVERSE (Pin 19)

This input is used to select the proper sequence of Outputs for

the desired direction of rotation for the Motor (See Table 3). An

internal pull-up resistor holds the input high when left open.

SENSE INPUTS (Pins 15, 16, 17)

These inputs provide control of the output commutation

sequence as shown in Table 3. S1, S2, S3 originate in the posi-

tion sensors of the motor and must sequence in cycle code or-

der. Hall Switch pull-up resistors are provided at Pins 15, 16 and

17. The positive supply of the Hall devices should be common

to the chip Vss.

BRAKE (Pin 9)

For the LS7262, a high level at this input unconditionally turns

Off Outputs 1, 2 and 3 and turns On Outputs 4, 5 and 6 (See

Fig. 2). For the LS7260, a high level at this input turns On Out-

puts 1, 2 and 3 and Outputs 4, 5 and 6 (See Fig. 1). In both

cases, transistors Q101, Q102 and Q103 cut off and transistors

Q104, Q105 and Q106 turn on, shorting the windings together,

The BRAKE has priority over all other inputs.

COMMON

ENABLE

BRAKE

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

CS1

CONNECTION DIAGRAM - TOP VIEW

(631) 271-0400 FAX (631) 271-0405

LS7260

LS7262

CS2

FWD/REV

OSCILLATOR

V TRIP

O V E R C U R R E N T S E N S E

(+V)

(-V)

October 2005

Related parts for ls7260

ls7260 Summary of contents

Page 1

... For the LS7262, a high level at this input unconditionally turns Off Outputs 1, 2 and 3 and turns On Outputs 4, 5 and 6 (See Fig. 2). For the LS7260, a high level at this input turns On Out- puts 1, 2 and 3 and Outputs 4, 5 and 6 (See Fig. 1). In both cases, transistors Q101, Q102 and Q103 cut off and transistors Q104, Q105 and Q106 turn on, shorting the windings together, The BRAKE has priority over all other inputs ...

Page 2

... NPN transistors or gate drive to N-Channel FET drivers. COMMON (Pin 5) The COMMON may be connected to Vss when using a center-tapped motor configuration or when using all NPN or N-Channel drivers. For the LS7260, the COMMON is tied to V Vss, V Supply voltage positive and negative terminals. SYMBOL ...

Page 3

... R 22 osc For the LS7260, (See Fig. 1) the external drivers also turn on in pairs. Internal operation is somewhat different than the LS7262. For example, external transistors Q101 and Q105 will turn on when internal transistor Q8 turns off and Q4 turns on enabling full power supply drive on Q101 and Q105 ...

Page 4

... Output Encoder 12 FIGURE 1. LS7260 THREE PHASE OUTPUT DRIVER CIRCUITRY BRAKE Output Encoder Vss 12 FIGURE 2. LS7262 THREE PHASE OUTPUT DRIVER CIRCUITRY 7260-012703 Vss 6 TO OVERCURRENT ADJUSTMENT ...

Page 5

... SG1731 or UC1637 can be interfaced with the LS7260 or LS7262. The logical OR gate made up of the resistor-diode net- work permits the LS7260 or LS7262 to be enabled when either the forward or reverse input is high. By applying TABLE 4. OUTPUT COMMUTATION SEQUENCE FOR FOUR PHASE OPERATION ...

Page 6

FIGURE 4. FOUR PHASE OUTPUT DRIVER CIRCUITRY FIGURE 4A 5 Vss COMMON 9 BRAKE INPUT LS7262 OVERCURRENT Vss FROM MOTOR ...

Page 7

... COMMUTATION 4 SEQUENCE SELECT LOGIC +V INPUT DECODER EDGE R Q DETECTOR + S - POSITIVE EDGE DETECTOR - + SAWTOOTH OSCILLATOR FIGURE 6. LS7260 AND LS7262 BLOCK DIAGRAM COMMON OUTPUT DRIVERS OUTPUT ENCODER + GND ...

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