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Original question:

TIDA-01505: Where can I find the TIDA-01505?

TIDA-01505: Level Shifter Supply +20V & -5V

SR
Prodigy 140 points
Part Number: TIDA-01505

Hello,

We have used TIDA-01505 reference design and fabricated a board for testing. Below are our queries:-

1. What is the purpose of jumper J14? Is it to externally supply +20V & -5V to the level shifter? In the application note "TI Designs: TIDA-01505 Automotive 40-V to 1-kV Input Flyback Reference Design Supporting Regenerative Braking Safety Test", this jumper is not present. In the reference design the transformer used is Coilcraft "WA8759-AL" which will provide auxiliary supplies of +20v & 5V. In such case, whether J14 is required?

2. The application note shows transformer "WA8537-BL", while the Reference design uses "WA8759-AL". Please confirm the difference

 

  • 0
    TI__Expert 5130 points

    Hello and thank you for your interest in Texas Instruments' Reference Designs.  Both of your questions regarding the TIDA-01505 design have been forwarded to the owning Automotive Systems team in Germany. Please allow us the next business day to respond. You should hear from our designer (Xun) no later than Monday, August 5th. 

    Best Regards,

    J. Fullilove

    Reference Design Operations

    Texas Instruments

  • 0
    TI__Mastermind 18121 points

    Dear Customer,

    1. External power supply is needed during startup phase. The auxiliary winding is not able to supply sufficient power during startup. The jumper is to connect to the external +20V and -5V power supply because the level shifter relies on the energy transfer from the winding to operated properly. There is no enough energy before the supply is fully on. When the output power is low, you may try to connect the R58 to the VDD node to take the power from R38, R40, R42... resistive chain. I recommend to decrease the value of this resistive chain in order to achieve sufficient power.

    2. WA8759-AL is used in the final design as per listed in the BOM. WA8537-BL was the last revision of the transformer.