Datasheet

LMD18201
www.ti.com SNVS092D –APRIL 1998–REVISED APRIL 2013
Figure 13. Bootstrap Circuitry
INTERNAL PROTECTION DIODES
A major consideration when switching current through inductive loads is protection of the switching power
devices from the large voltage transients that occur. Each of the four switches in the LMD18201 have a built-in
protection diode to clamp transient voltages exceeding the positive supply or ground to a safe diode voltage drop
across the switch.
The reverse recovery characteristics of these diodes, once the transient has subsided, is important. These
diodes must come out of conduction quickly and the power switches must be able to conduct the additional
reverse recovery current of the diodes. The reverse recovery time of the diodes protecting the sourcing power
devices is typically only 70 ns with a reverse recovery current of 1A when tested with a full 3A of forward current
through the diode. For the sinking devices the recovery time is typically 100 ns with 4A of reverse current under
the same conditions.
TYPICAL APPLICATIONS
BASIC MOTOR DRIVER
The LMD18201 can directly interface to any Sign/Magnitude PWM controller. The LM629 is a motion control
processor that outputs a Sign/Magnitude PWM signal to coordinate either positional or velocity control of DC
motors. The LMD18201 provides fully protected motor driver stage.
Figure 14. Basic Motor Driver
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