themaccabee
Full Member level 4
HI ,,
I want to design an overvoltage + transient protection to a circuit using a fuse + unidirectional TVS diode combination.
**broken link removed**
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The input power supply is 3V,Max current required is 2.7A
The problem is the ideal selection of the fuse & TVS diode so that the TVS diode will survivie in an unwanted input transient condition & only the fuse will blow.
I was reading the basic considerations for selecting the fuse & TVS diodes.
The fuse parameters are
1)current rating
2)volatage rating
3)I2t rating
TVS Diode parameters
1) Reverse Standoff Voltage
2) Break Down Voltage
3) Peak Pulse Current rating
The current ,voltage of the fuse could be designed easily
like wise the reverse stand off & Break down voltage of TVS can be selected easily.
When comes to the I2t rating & Peak Pulse Current rating, i dunno what to do,
Ive got the basic idea that when the transient condition occurs the TVS will conduct current largely after the break down.The maximum allowable current fllowing at this time must be limited & the fuse must blow before the TVS could be damaged.
The fuse parameter determining melting is I2t ,,how could could i determine that fuse will blow with sufficient margin protecting theTVS and rest of the circuit..
Can somebody help with this design,The datasheets of fuse and the TVS i m considering are attached.
Thanks & Regards
I want to design an overvoltage + transient protection to a circuit using a fuse + unidirectional TVS diode combination.
**broken link removed**
Uploaded with ImageShack.us
The input power supply is 3V,Max current required is 2.7A
The problem is the ideal selection of the fuse & TVS diode so that the TVS diode will survivie in an unwanted input transient condition & only the fuse will blow.
I was reading the basic considerations for selecting the fuse & TVS diodes.
The fuse parameters are
1)current rating
2)volatage rating
3)I2t rating
TVS Diode parameters
1) Reverse Standoff Voltage
2) Break Down Voltage
3) Peak Pulse Current rating
The current ,voltage of the fuse could be designed easily
like wise the reverse stand off & Break down voltage of TVS can be selected easily.
When comes to the I2t rating & Peak Pulse Current rating, i dunno what to do,
Ive got the basic idea that when the transient condition occurs the TVS will conduct current largely after the break down.The maximum allowable current fllowing at this time must be limited & the fuse must blow before the TVS could be damaged.
The fuse parameter determining melting is I2t ,,how could could i determine that fuse will blow with sufficient margin protecting theTVS and rest of the circuit..
Can somebody help with this design,The datasheets of fuse and the TVS i m considering are attached.
Thanks & Regards