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 (V_ss - V_DD).
• 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.


Pinout




Specifications

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

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. LS7260 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.