HMC788A damaged

Hello, I found a problem when using HMC788A .

Six pieces of hmc788a share a 5v power supply generated by TPS7A91. Each HMC788A  is biased via a TCCH-80 (minicircuits).
The problem is that some amplifiers would draw a high current (about 400mA) and get damaged . This happens randomly.

What are the possible reasons for this??



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[edited by: jerry_12345 at 2:02 AM (GMT -4) on 6 Jun 2021]
Parents
  • Dan,

    We're seeing the same issue and we are using a 6.7 uH conical inductors from Piconics. We see the same sort of thing. The current draw shoots up and the amp dies. It still passes a signal through it but there is no amplification.

    It seems to happen at random. We currently have a system that uses 16 of these amps on 8 RF channels. We've had 4 channels blow in he last hour.

Reply
  • Dan,

    We're seeing the same issue and we are using a 6.7 uH conical inductors from Piconics. We see the same sort of thing. The current draw shoots up and the amp dies. It still passes a signal through it but there is no amplification.

    It seems to happen at random. We currently have a system that uses 16 of these amps on 8 RF channels. We've had 4 channels blow in he last hour.

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