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July 2009 Doc ID 15084 Rev 1 1/57
AN2836
Application note
L6225, L6226, L6227 dual full-bridge drivers
1 Introduction
Modern motion control applications need more flexibility that can be addressed only with
specialized IC products. The L6225, L6226, L6227 are dual full-bridge driver ICs specifically
developed to drive a wide range of motors. These ICs are one-chip, cost-effective solutions
that include several unique circuit design features. These features allow the devices to be
used in many applications including DC and stepper motor driving. The principal aim of this
development project was to produce easy-to-use, fully-protected power ICs. In addition
several key functions such as protection circuit and PWM current control drastically reduce
the number of external components to meet requirements for many different applications.
The L6225, L6226, L6227 are highly integrated, mixed-signal power ICs that allow the user
to easily design a control system for two-phase bipolar stepper motors, multiple DC motors
and a wide range of inductive loads. Figure 1 to Figure 3 show the block diagrams of the
L6225, L6226, L6227 . Each IC integrates eight power DMOS plus other added features for
safe operation and flexibility. The L6227 also features a constant tOFF PWM current control
technique (synchronous mode) for each of the two full bridges
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