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Original question:

SN6505B: Use with cascode transistors for high Vin application

SN6505B: SN6505B application questions

Eason Yuan
Intellectual 840 points
Part Number: SN6505B
Other Parts Discussed in Thread: SN6501

Hi team，

My customer met question as following when they used SN6505B，could you please help it？ Thanks！

Question 1: In Figure 1, is the requirement of voltage * time value corresponding to the unipolar application parameter or bipolar application parameter (see the red line part of the recommended WE transformer parameter in Figure 2)?

Question 2: How many parameters are there between the unipolar application parameters and bipolar application parameters of the red line part of the WE transformer parameter? (Eg unipolar application parameter is voltage between PIN 1-2 * time parameter; bipolar application parameter is voltage between PIN 1-3 * time parameter)

Question 3: Please help confirm whether the CGDT75 transformer in the attachment is used in SN6505B application, can it meet the application of 100mA current?

  • 0
    TI__Genius 17100 points

    Hi Eason,

    Thank you for posting to E2E!

    1. When using the SN650x transformer drivers, bipolar V-t products apply as relevant transformer specifications since the transformer core's magnetizing force (H) and flux density (B) will oscillate between positive and negative. These points are shown as points A and A' in the SN6501 and SN6505 datasheets' image below:


      This transformer's unipolar V-t product applies if voltage across the transformer has only one polarity.

    2. The differences in V-t product are not necessarily attributed to how measurements are made, but instead to how the transformer is configured, so, as denoted by the Wurth datasheet, the only spec that changes between unipolar and bipolar operation for this transformer is V-t product: unipolar V-t applies when pins 1 - 3 of the transformer are connected to signals between 0V and +V where bipolar V-t products apply when voltage swings from positive to negative values between pins 1-3.

    3. This CGDT75 transformer seems compatible from the datasheet, but bench tests would confirm since the 10.16 Vus V-t product can de-rate at frequencies and temperatures above the measuring condition.


    Please follow up if there are additional questions.


    Thank you for your time, and have a great weekend!
    Manuel Chavez