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STMicroelectronics Electronic Components Datasheet

L6258E Datasheet

PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER

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L6258E pdf
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L6258E
PWM controlled
high current DMOS universal motor driver
Not For New Design
Features
Able to drive both windings of a bipolar stepper
motor or two DC motors
Output current up to 1.2A 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
L6258E 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.
L6258E 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 1.2A per winding in continuous mode,
with peak start-up current up to 1.5A. A thermal
protection circuitry disables the outputs if the chip
temperature exceeds the safe limits.
Table 1. Device summary
Order code
L6258E
(Replaced by L6258EX)
Package
PowerSO36
Packing
Tube
December 2007
Rev 8
This is information on a product still in production but not recommended for new designs.
1/31
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1


STMicroelectronics Electronic Components Datasheet

L6258E Datasheet

PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER

No Preview Available !

L6258E pdf
Contents
L6258E
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2/31


Part Number L6258E
Description PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER
Maker STMicroelectronics
Total Page 30 Pages
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