TPL7407LA

IN3

IN4

OUT1

OUT2

OUT3

OUT4

IN5

IN6

IN7

GND

OUT5

OUT6

OUT7

COM

IN1

IN2

Phase_C

Phase_B

Phase_D

Motor

Phase_A

Optional

Motor Control Pulses

(1.8 V to 5 V)

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9

TPL7407LA

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SLRS073 – MAY 2017

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Copyright © 2017, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The TPL7407LA is typically used to drive a high voltage and/or current peripheral from an MCU or logic device

that cannot tolerate these conditions. The following design is a common application of the TPL7407LA, driving

inductive loads. This includes motors, solenoids & relays. Each load type can be modeled by what's seen in

Figure 7.

8.1.1 Unipolar Stepper Motor Driver

Figure 5. Stepper Motor Driver Schematic

Figure 5 shows an implementation of the TPL7407LA for driving a uniploar stepper motor. The unconnected

input channels can be used for other functions. When an input pin is left open the internal 1-M

Ω pull down

resistor pulls the respective input pin to GND potential. For higher noise immunity use an external short across

an unconnected input and GND pins. The COM pin must be tied to the supply of whichever inductive load is

being driven for the driver to be protected by the free-wheeling diode.