ST STEVAL-ILL009V1, Application Note

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Over voltage protection AN2531
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6 Over voltage protection
6.1 Description
The maximum voltage on the output channels of STP04CM596 is 16 V. Any wire or PCB
track connection between LEDs and STP04CM596 driver presents a parasitic inductance as
shown in
Figure 8 . This parasitic inductance produces voltage spikes on the outputs of the
driver when the driver is turning off the LEDs and it can be dangerous for the STP04CM596
as it can exceed the maximum output voltage rating. Generally, higher current and higher
parasitic inductance (long cable) means higher voltage peaks. Therefore over voltage
protection is very important for high brightness LEDs in case of long connections between
the driver and LEDs.
Figure 8. Over voltage on STP04CM596
AM00291
SPI
STP04CM596
Control
and
logic
part
4 V at 3 A
Temperature sensor
Full color pixel
Over voltage
Maximum output
voltage 16 V
Lp
Lp
Lp
Lp