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TPL7407L

SLRS066D – JANUARY 2014 – REVISED MARCH 2016

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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

TPL7407L will typically be 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 TPL7407L, driving

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

Figure 9.

8.2 Typical Application

8.2.1 Inductive Load Driver

Please note that inductive loads, such as stepper motors or relays, can generate negative transients on the

OUTx pins of the device. Typically this occurs when the output channel FET turns ON, pulling the OUTx node to

ground. This can cause the OUTx node to go below the voltage rating listed in the Absolute Maximum Ratings

table, which in effect causes excessive ground current leakage. This effect is only seen on the OUT7 pin, and

prolonged usage in this condition can cause permanent damage to the device.

If the application has an inductive load connected to OUT7, it is recommended to use an external Schottky diode

to protect the OUT7 pin from negative transients larger than those listed in the Absolute Maximum Ratings table,

such as in Figure 9 below.

Figure 9. Inductive Load Driver Schematic