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TPS3700-Q1 / Under Voltage Detection(min)

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: TPS3700-Q1, TPS3702-Q1, TPS3700

Hello,

According to Figure 1 of TPS3700-Q1, should I use "VIT+"-"Vhys" as VIT-(min) minimum detection under voltage?

If yes, the VIT-(min) is 384mV(min). ( VIT+(min) - Vhys(max) = 396mV - 12mV=384mV)
However, the VIT- is specified as 387mV.
Should we use 384mV for worst case of under voltage detection?

In the TPS3702-Q1, the VIT+(OV) and the VIT-(UV) is specified. Thus, I can use VIT-(UV)(min) as worst case.
I couldn't understand reason that the TPS3700-Q1 timing diagram is described by VIT+ for under voltage detection.

TPS3700-Q1 Timing Diagram.pptx


Best Regards,
Ryuji Asaka

  • 0
    TI__Guru 55940 points
    Asaka-san,

    Because Vhys has a max spec of 12mV, you will not have a delta of greater than 12mV from Vit- to Vit+.

    Vit-(minimum) is the worst case of the under voltage detection, but in order to see this minimum threshold (387mV), the Vit+ threshold must be 399mV or lower.

    The timing diagram could have been drawn from the perspective of Vit+ or Vit-. Because you cannot have a device that has Vit+(max) and Vit-(min) due to the maximum specification on Vhys, the timing diagram was drawn using Vit+ and Vhys only.

    Very Respectfully,
    Ryan