[SOLVED] BJT for startup circuit

[--BawA--]

I am designing a startup bias circuit for my forward converter , i need a bjt of following configurations
Vceo = 400V
Ic= 300 mA

Also this BJT should be easily available and cheap.

 

[ahsan_i_h]

You can use MJE13003. It has many type of packages. Easily available. Vceo=400V. Ic=more than 300mA. Datasheet link http://www.unisonic.com.tw/datasheet/MJE13003.pdf

 

[--BawA--]

ahsan , could you please tell me any Diode , which can be used for rectification purpose at the secondary of forward converter. The diode specs are
50V or above
10 Ampere
Ultrafast
easily available and cost effective

 

[ahsan_i_h]

In forward converter there are two diodes connected their cathodes together with one terminal of output inductor. So you can use dual diodes in one package with common cathodes.
MBR(or SBL)1660CT (16A(total),60V) is a dual schottky diode in one package. Datasheet link http://www.eicsemi.com/datasheet/MBR1660C.PDF
There is an easy relation with the part number and the ratings of the diode. You can edit part number to get higher ratings. These are easily available.