[help] 1n4148 for 16kHz switching frequency

Discussion in 'General Electronics Chat' started by etiquoe, Nov 2, 2010.

  1. etiquoe

    Thread Starter New Member

    Jul 11, 2010
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    hi....
    i'm using 1n4148 for bootstrap diode. i am going to use 16 kHz PWM signal. is 1n4148 an apropriate choice for 16 kHz switching frequency?


    regards
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    16kHz is probably fine - but what about the rest of the diode ratings? Are they likely to be exceeded? What's the circuit look like?
     
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  3. etiquoe

    Thread Starter New Member

    Jul 11, 2010
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    the Vcc is 15V, and the current is less than 1A
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    How much less than 1A?
     
  5. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    A 1N5819 might work. What's it for?
     
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  6. SgtWookie

    Expert

    Jul 17, 2007
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    1N4148 diodes are suitable for up to around 100mA continuous current. The absolute maximum peak rating is 1A for 1 second , but Vf then exceeds 1v.

    You'd probably be better off using something like a BAT42, BAT43, 1N5817 thru 1N5819 - basically, a Schottky diode with a reverse voltage rating higher than you expect it to see.

    Ultrafast switching diodes can also be used, but they will have a higher Vf than Schottky types.
     
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  7. etiquoe

    Thread Starter New Member

    Jul 11, 2010
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    it's about 2 mA
     
  8. etiquoe

    Thread Starter New Member

    Jul 11, 2010
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    it's for bootstrap diode in MGD circuit for bldc driver bridge
     
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