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Part Number: ISO7720
Customer has two questions below.Could you answer me, please?
Q1:How fast is the carrier frequecy?Q2:How much is the range of spread spectrum by Emissions Reduction function?
Customer has a issue at noise insertion test.It is that voltage waveform is not same between input and output. He wants to know to consider this issue. Signal is about 100bps.
In reply to Anand Reghunathan:
In reply to masahiko shimizu:
As Anand mentioned, ISO7420 is an older generation device and ISO7720 is our latest digital isolator family.
ISO7720 being more robust is not expected to cause an issue.
In reply to Tejas Hommaradi:
Could you please give few more details about the failure?What issue has occurred? Did ISO7720F fail IEC-61000-4-5?What level of IEC-61000-4-5 did customer test? (Voltage level)
Could you also describe the nature of failure? What has gone wrong in the device post stress? Higher ICC or device functionality?
Thank you for your reply.I answer below.
>Could you please give few more details about the failure?>What issue has occurred? Did ISO7720F fail IEC-61000-4-5?->Customer system is 400W power conditioner. ISO7720F is used to isolate IGBT driver. When customer tests IEC-61000-4-5, IGBT was disrupted. Customer thinks this cause is the shoot through by turning on High side FET and Low side FET at same time. Before, Customer had used ISO7420. At this time, When customer tested IEC-61000-4-5, IGBT was disrupted. This cause is incorrect operation of ISO7420. Below picture is the waveform at ISO7420 issue.
>What level of IEC-61000-4-5 did customer test? (Voltage level)->2kV
>Could you also describe the nature of failure? ->I still can't do it now. I requested the waveform at ISO7720F. Customer thinks the cause of IGBT destruction is incorrect operation of ISO7720F.
>What has gone wrong in the device post stress? Higher ICC or device functionality? ->When customer tests IEC-61000-4-5, this issue occur.
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