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TPS3700: Asking for the TPS3700 Vhys calculation

SHH
Mastermind 30251 points
Part Number: TPS3700

Hi Team,
My customer is designning the TPS3700.
Could you explain for how to get the Vhys min and max values' conditions? And how to calculate the Vit+-Vit-=12V?

It seems not match the Vit+ and Vit- min and max table.

Thansk,
SHH

  • 0
    TI__Genius 12630 points

    Hello,

    Vhys = Vit+ - Vit-

    If we take the typical values for both Vit+ (TYP) and Vit- (TYP) we get Vhys = 400mV - 394.5mV = 5.5mV which is the typical value for Vhys since it uses the typical value for both Vit+ and Vit-

    Now if we take Vit+ (MAX) and Vit- (MIN), we find that Vhys would be 17mV but the Vhys is designed to be no more than 12mV MAX. This means that if Vit+ for a particular device is 404mV, the Vit- for that same device must be within 12mV. This is defined by the device design. This helps prevent such a wide spread for Vhys if Vit+ and Vit- vary from their typical values.

    I hope this helps! Please let me know if you have any additional questions. Thanks!

    -Michael