Field failures of TFS IC
Hi,
We are using TFS7707H for generating 12V@15A as a supply for our telecom products.
We are facing field failure of IC TFS7707H (IC blast).
We are not able to find the root cause of failure of this IC tfs7707h.
We suspect the wrong selection of series resistor R2 and R3 which is used to limit peak reverse current of diodes D2 and D3 as in the fig.15 of TFS hyper family. We have used R2 = 1ohms / 1watt ad R3 = 1ohms / 1watt. Diodes D2 an D3 are glass passivated 1N4007 diodes.
Could this be the main cause of failure of TFS7707H IC.
Please reply.
Regards,
KIRAN SURVE
评论
Hi,
My TFS design does not require standby operation. in any operating conditions.
As per TFS7701-7708 HiperTFS-2 Family datasheet, fig 30 on page 25 -Design Example: 12 V / 15 A Main Output, 12 V, 0.83 A Standby, can I keep R16 resistor value as open?
Hi Kiran,
Yes. However, there will be an impact with no-load consumption. This resistor is important to keep the bypass pin voltage supplied even in no-load condition.
During normal operation at different loads, you need to ensure that the voltage supplied for the Bypass pin is always above 6V. Recommended value is 12V supply with 7.5Kohm resistor in between the supply and the bypass pin
Regards, Gavin
Hi,
You may refer to page 16 of the product datasheet for standard values for Clamp-to-Rail Scheme: hipertfs-2_family_datasheet.pdf (power.com)
We also coordinated with our local sales team in your area. They will be reaching out to you to assist with your concern.
Regards, Gavin