9.2.2.3 Driving Inductive Loads

The TIOS102(x) family is capable of magnetizing and demagnetizing large inductive loads. These devices

contain internal circuitry that enables fast demagnetization when configured as either P-switch or N-switch mode.

In P-switch configuration, the load inductor L is magnetized when the OUT pin is driven high. When the PNP is

turned off, there is a significant amount of negative inductive kick back at the OUT pin. This voltage is clamped

internally at about -15 V.

Similarly, in N-switch configuration, the load inductor L is magnetized when the OUT pin is driven low. When the

NPN is turned off, there is a significant amount of positive inductive kick back at the OUT pin. This voltage is

clamped internally at about 15 V.

The equivalent protection circuits are shown in Figure 9-2 and Figure 9-3. The minimum value of the resistive

load R can be calculated as:

VCC

(

)

O LIM

V

R

I

(7)

spacer

L

R

OUT

VCC

Rev.

Polarity

Protection

Rev. Polarity

Protection

ESD and

Surge

Protection

ESD and

Surge

Protection

GND

Figure 9-2. PNP Mode

L

R

OUT

VCC

Rev.

Polarity

Protection

Rev. Polarity

Protection

ESD and

Surge

Protection

ESD and

Surge

Protection

GND

Figure 9-3. NPN Mode

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SLLSFL4A – FEBRUARY 2022 – REVISED DECEMBER 2022

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