E-L6258EX STMicroelectronics

L6258EX PWM controlled high current DMOS universal motor driver Features Able to drive both windings of a bipolar stepper motor or two DC motors Output current up to 1.5A each winding Wide voltage range: 12V to 40V Four quadrant current control, ideal for microstepping and DC motor control Precision PWM control PowerSO36 No need for recirculation diodes TTL/CMOS compatible inputs Cross conduction protection Thermal shutdow The power stage is a dual DMOS full bridge capable of sustaining up to 40V, and includes the Description diodes for current recirculation.The output current capability is 1.5A per winding in continuous mode, L6258EX is a dual full bridge for motor control with peak start-up current up to 2A. A thermal applications realized in BCD technology, with the protection circuitry disables the outputs if the chip capability of driving both windings of a bipolar temperature exceeds the safe limits. stepper motor or bidirectionally control two DC motors. L6258EX and a few external components form a complete control and drive circuit. It has high efficiency phase shift chopping that allows a very low current ripple at the lowest current control levels, and makes this device ideal for steppers as well as for DC motors. Table 1. Device summary Order code Package Packing E-L6258EX PowerSO36 Tube E-L6258EXTR PowerSO36 Tape&Reel December 2007 Rev 6 1/32 www.st.com 1Contents L6258EX Contents 1 Block diagram 5 2 Functional description 10 2.1 Reference voltage 11 2.2 Input logic (I0 - I1 - I2 - I3) 12 2.3 Phase input ( PH ) 13 2.4 Triangular generator . 13 2.5 Charge pump circuit . 13 2.6 Current control loop . 14 2.7 Current control loop compensation . 15 3 PWM current control loop . 16 3.1 Open loop transfer function analysis 16 3.2 Power amplifier . 17 3.3 Load attenuation 18 3.4 Error amplifier and sense amplifier 19 3.5 Effect of the Bemf on the current control loop stability . 22 4 Application information . 24 4.1 Interference . 24 4.2 Motor selection . 25 4.3 Unused inputs . 25 4.4 Notes on PCB design 26 5 Operation mode time diagrams . 27 6 Package information 30 7 Revision history . 31 2/32