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STMicroelectronics Electronic Components Datasheet

L6258EX Datasheet

PWM controlled high current DMOS universal motor driver

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L6258EX pdf
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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
No need for recirculation diodes
TTL/CMOS compatible inputs
Cross conduction protection
Thermal shutdow
Description
L6258EX is a dual full bridge for motor control
applications realized in BCD technology, with the
capability of driving both windings of a bipolar
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.
PowerSO36
The power stage is a dual DMOS full bridge
capable of sustaining up to 40V, and includes the
diodes for current recirculation.The output current
capability is 1.5A per winding in continuous mode,
with peak start-up current up to 2A. A thermal
protection circuitry disables the outputs if the chip
temperature exceeds the safe limits.
Table 1. Device summary
Order code
E-L6258EX
E-L6258EXTR
Package
PowerSO36
PowerSO36
Packing
Tube
Tape&Reel
December 2007
Rev 6
1/32
www.st.com
1


STMicroelectronics Electronic Components Datasheet

L6258EX Datasheet

PWM controlled high current DMOS universal motor driver

No Preview Available !

L6258EX pdf
Contents
Contents
L6258EX
www.datas1heet4u.com 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


Part Number L6258EX
Description PWM controlled high current DMOS universal motor driver
Maker STMicroelectronics
Total Page 30 Pages
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