TIOS101 Datasheet, PDF (19/26 Pages) Texas Instruments – Digital Sensor Output Drivers with Integrated Surge Protection

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TIOS101
SLLSEV6 – JULY 2017
9.2.2.3 Driving Inductive Loads
The TIOS101 family is capable of magnetizing and demagnetizing inductive loads up to 1.5 H. 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 -75 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 75 V.
The equivalent protection circuits are shown in Figure 15 and Figure 16. The minimum value of the resistive load
R can be calculated as:
V _VCC
R
I_O(LIM)
(7)
VCC
VCC
OUT
L
R
TIOS101
Copyright © 2016, Texas Instruments Incorporated
Figure 15. PNP Mode
R
OUT
L
TIOS101
Copyright © 2016, Texas Instruments Incorporated
Figure 16. NPN Mode
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