ESDA25DB3RL Просмотр технического описания (PDF) - STMicroelectronics
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ESDA25DB3RL Datasheet PDF : 5 Pages
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CALCULATION OF THE CLAMPING VOLTAGE
USE OF THE DYNAMIC RESISTANCE
The ESDA family has been designed to clamp fast
spikes like ESD. Generally the PCB designers
need to calculate easily the clamping voltage VCL.
This is why we give the dynamic resistance in
addition to the classical parameters. The voltage
across the protection cell can be calculated with
the following formula:
VCL = VBR + Rd IPP
WhereIpp is the peakcurrent throughthe ESDAcell.
ESDA25DB3
As the value of the dynamic resistance remains
stable for a surge duration lower than 20µs, the
2.5µs rectangular surge is well adapted. In addition
both rise and fall times are optimized to avoid any
parasitic phenomenon during the measurement of
Rd.
DYNAMIC RESISTANCE MEASUREMENT
The short duration of the ESD has led us to prefer
a more adapted test wave, as below defined, to the
classical 8/20µs and 10/1000µs surges.
I
Ipp
2µs
t
tp = 2.5µs
2.5µs duration measurement wave.
3/5
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