LS7290
Overview
The LS7290 generates Phase Drive outputs a nd PWM output s for controlling twophase Bipolar Motors or four-phase Un ipolar Motors, respectively. The LS7290 contains a mod e controlled loo k-up.
- July 2011 Controls Bipolar and Unipolar motors Cost-effective replacement for L297 Full, ½ step mode selected with mode input Direction control Reset input Step control input Enable input PWM chopper circuit for current control Two peak-current comparators with external reference input Step control frequency and duty cycle controlled by an external frequency source or by an internal crystal controlled oscillator (typically 8 MHz) All inputs and outputs TTL/CMOS compatible (TTL for 5V operation) 3V to 5.5V Operation (VDD - VSS) LS7290 (DIP), LS7290-S (SOIC), LS7290-TS (TSSOP) - See Figure 1.
