LS7234-S, LS7237, LS7260 Selling Leads, Datasheet
MFG:LSI Package Cooled:SOP-8 D/C:07+
LS7234-S, LS7237, LS7260 Datasheet download
Part Number: LS7234-S
MFG: LSI
Package Cooled: SOP-8
D/C: 07+
LS7234-S, LS7237, LS7260
- Table of contents:
Info of LS7234-S
Info of LS7237
Info of LS7260
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About LS7030
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Datasheet: LS7030
File Size: 68055 KB
Manufacturer: LSI [LSI Computer Systems]
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About LS7237
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Datasheet: LS7237
File Size: 44491 KB
Manufacturer: LSI [LSI Computer Systems]
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About LS7260
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Datasheet: LS7260
File Size: 81496 KB
Manufacturer: LSI [LSI Computer Systems]
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LS7237 General Description
LS7237 is a monolithic, MOS integrated circuit designed to control the brightness of an incandescent lamp. The output of the LS7237 triggers a triac connected in series with a lamp(See Figure 5). The lamp brightness is determined by controlling the output conduction angle (triac triggering angle) in relation to the AC line frequency (See Figure 2).
The output conduction angle can be varied by applying a low level pulse at the SENS input or a high level pulse at the EXT input. When implemented as shown in Figure 5, this is accomplished by touching the Touch Plate which causes the lamp brightness to change in specified steps as follows
LS7237 Features
• PLL synchronization allows use as a Wall Switch
• Provides brightness control of an incandescent lamp with a touch plate or mechanical switch
• Can control speed of shaded pole and universal AC motors
• Controls the "duty cycle" from 23% to 88% (conductionangles for AC half-cycles between 45° and 158°, respectively)
• Operates at 50Hz/60Hz line frequency
• Extension input for remote activation
• +12V to +18V DC Power Supply (VSS - VDD)
• 8-Pin Plastic DIP , 8-Pin SOIC-See Figure 1
• Provides brightness control of an incandescent lamp with a touch plate or mechanical switch
• Can control speed of shaded pole and universal AC motors
• Controls the "duty cycle" from 23% to 88% (conductionangles for AC half-cycles between 45° and 158°, respectively)
• Operates at 50Hz/60Hz line frequency
• Extension input for remote activation
• +12V to +18V DC Power Supply (VSS - VDD)
• 8-Pin Plastic DIP , 8-Pin SOIC-See Figure 1
LS7237 Connection Diagram
LS7260 General Description
The LS7260/LS7262 are monolithic, MOS integrated circuits designed 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. The circuits respond 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. Overcurrent circuitry is provided to protect the windings, associated drivers and power supply. The overcurrent circuitry causes the external output drivers to switch off immediately upon sensing the overcurrent condition and on again only when the overcurrent condition disappears and the positive 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 deceleration.
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.
They are the basic building blocks of a brushless DC motor controller. The circuits respond 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. Overcurrent circuitry is provided to protect the windings, associated drivers and power supply. The overcurrent circuitry causes the external output drivers to switch off immediately upon sensing the overcurrent condition and on again only when the overcurrent condition disappears and the positive 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 deceleration.
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.
LS7260 Maximum Ratings
| PARAMETER | SYMBOL | VALUE | UNIT |
| Storage Temperature | TSTG | -65 to +150 | |
| Operating Temperature | TA | -25 to +85 | |
| Voltage (any pin to Vss) | TA (1) | -40 to +125 | |
| (1) Available on special order. Contact factory for details. | VMAX | -30 to +.5 | V |
LS7260 Features
• Direct drive of P-Channel and N-Channel FETs (LS7260)
• Direct drive of PNP and NPN transistors (LS7262)
• Six outputs drive power switching bridge directly
• Open or closed loop motor speed control.
• +5V to +28V 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
• Direction control
• Output Enable control
• Positive Static Braking
• Overcurrent Sensing
• LS7260, LS7262 (DIP); LS7260-S, LS7262-S (SOIC) LS7260-TS, LS7262-TS (TSSOP) - See Connection Diag.
• Direct drive of PNP and NPN transistors (LS7262)
• Six outputs drive power switching bridge directly
• Open or closed loop motor speed control.
• +5V to +28V 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
• Direction control
• Output Enable control
• Positive Static Braking
• Overcurrent Sensing
• LS7260, LS7262 (DIP); LS7260-S, LS7262-S (SOIC) LS7260-TS, LS7262-TS (TSSOP) - See Connection Diag.
LS7260 Connection Diagram
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