ls7262 LSI Computer Systems, Inc., ls7262 Datasheet

ls7262

Manufacturer Part Number

ls7262

Description

Brushless Dc Motor Commutator/controller

Manufacturer

LSI Computer Systems, Inc.

Datasheet

1.LS7262.pdf (8 pages)

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FEATURES:

•

DESCRIPTION:

The LS7262 is a MOS integrated circuit designed to generate the

signals necessary to control a three phase or four phase brushless

DC motor. LS7262 is the basic building block of a brushless DC

motor controller. The circuit responds to changes at the SENSE

inputs originating at the motor position sensors to provide electronic

commutation of the motor windings. Pulse width modulation of

outputs for motor speed control is accomplished through either the

ENABLE input or through the Analog input (VTRIP) in conjunction

with the OSCILLATOR input. Over-current circuitry is provided to

protect the windings, associated drivers and power supply. The over-

current circuitry causes the external output drivers to switch off

immediately upon sensing the over-current condition and on again

only when the over-current condition disappears and the positive

edge of either the ENABLE input or the saw-tooth OSCILLATOR

occurs. This limits the over-current sense cycling to the chopping rate

of the ENABLE input or the saw-tooth OSCILLATOR.

A positive braking feature is provided to effect rapid deceleration.

The LS7262 is designed for driving NPN and PNP transistors. Using

an additional CMOS driver, the LS7262 outputs are buffered to drive

both NMOS and PMOS power FETs and will generate 12V drive for

both the N-channel and P-channel devices when using a 12V power

supply.

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.

7262-051711-1

Direct drive of PNP and NPN transistors

Buffered drive of P-Channel and N-Channel FETs

Six outputs for driving power switching bridge

Open or closed loop motor control

+5V to +28V operation (V

Externally selectable input to output code for 60°, 120°,240°,or

300° electrical sensor spacing

Three or four phase operation

Analog speed control

Direction control

Output enable control

Positive static braking

Over-current sensing

LS7262 (DIP), LS7262-S (SOIC), LS7262-TS (TSSOP)

BRUSHLESS DC MOTOR COMMUTATOR/CONTROLLER

- V

)

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 position sensors of the

motor and must sequence in cycle code order. 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 V

BRAKE (Pin 9)

A high level at this input unconditionally turns off outputs OUT 1,2

and 3 and turns on outputs OUT 4, 5 and 6 (See Fig. 2.).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. An internal pull-down resistor holds the input low

when left open. (Center-tapped motor configuration requires a power

supply disconnect transistor controlled by the BRAKE signal – See

Figure 2A).

ENABLE (Pin 10)

A high level at this input permits the output to sequence as in Table

3, while a low disables all external output drivers. An internal pull-up

PIN -ASSIGNMENT – TOP VIEW

LS7262

May 2011

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ls7262 Summary of contents

Page 1

... The LS7262 is a MOS integrated circuit designed to generate the signals necessary to control a three phase or four phase brushless DC motor. LS7262 is the basic building block of a brushless DC motor controller. The circuit responds to changes at the SENSE inputs originating at the motor position sensors to provide electronic commutation of the motor windings ...

Page 2

Positive edges at this input will reset the over-current flip-flop. OVER-CURRENT SENSE (Pin 12) This input provides the user a way of protecting the motor winding, drivers and power supply from an ...

Page 3

MAXIMUM RATINGS: PARAMETER DC Supply Voltage Any Input Voltage Storage Temperature Operating Temperature DC ELECTRICAL CHARACTERISTICS: (All Voltages Referenced 25°C unless otherwise specified PARAMETER Supply Voltage Supply Current (Outputs not ...

Page 4

... FIGURE 1. LS7262 THREE PHASE OUTPUT DRIVER CIRCUITRY FWD/REV = 1 FWD/REV = 0 DRIVERS OUTPUTS ENABLED Off Off - + O2 O6 Off O4 - Off + Off O1 O5 ...

Page 5

... This configuration requires only one base current limiting resistor connected from the COMMON pin to VSS. 7262-051711-5 FIGURE 2. LS7262 THREE PHASE OUTPUT DRIVER CIRCUITRY FIGURE 2. LS7262 THREE PHASE OUTPUT DRIVER CIRCUITRY FIGURE 2A. SINGLE-ENDED DRIVER CIRCUIT This configuration requires only one base ...

Page 6

... SG1731 or UC1637 can be interfaced with the LS7262. The logical OR gate made up of the resistor-diode network permits the LS7262 to be enabled when either the forward or reverse input is high. By applying the forward input directly to Pin 19, the motor can only operate in the forward direction when the forward input is high and only in the reverse direction when the reverse input is high ...

Page 7

FIGURE 4. FOUR PHASE OUTPUT DRIVER CIRCUITRY FIGURE ...

Page 8

The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc assumes no responsibilities for inaccuracies, or for any infringements of patent rights of others which may result from its use. ...

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