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how does this circuit works?
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Danesh_SA:
Hi All,
Im on a isolated digital output circuit,i found this circuit.could you expain me how it works? what does BAV70 do here?
erikka:
See equivalent circuit of each driver
The diodes are to clamp the output between GND and Vcc
Danesh_SA:
I design 4 channel digital output for industrial system ,I want to use ULN2803 instead of TBD62783 in my design.
but don't understand the usage of BAV70 here,this is DIGITAL OUTPUT ,why in this design use CLAMP diodes?
awallin:
if you have inductive loads (relays) they might give enough 'kick' to damage the driver, without protecting diodes?
PKTKS:

--- Quote from: Danesh_SA on December 23, 2019, 03:10:06 pm ---(..)
but don't understand the usage of BAV70 here,this is DIGITAL OUTPUT ,why in this design use CLAMP diodes?

--- End quote ---

ESD or worst spikes
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