Is it possible to adjust hysteresis of NCP304?

[tony_lth]

Hi, ALL,
In NCP304 datasheet, the following method make me confused, as the following picture:
It seems the equation for calculated hysteresis is wrong.
I want to adjust hysteresis to more than 1V, say Vth- is 2.7V Vth+ is 3.7V, but the datasheet shows hysteresis only is about 0.35mV change.
What a confusion datasheet.
I checked several version of NCP304 datasheet, and found the same method and the data. So I should be wrong on adjusting hysteresis.
Is it possible to adjust hysteresis of NCP304 to more than 1V?

 

[KlausST]

Hi,

the datasheet shows hysteresis only is about 0.35mV change.

I agree there is a mistake. The unit obviously should to be "V" instead of "mV".
Then 3.15V - 2.7V = 0.45V or better say 0.1V (from device) + 0.35V (from external circuitry)

To make it switch "ON" at 3.7V you just need to calculate the "voltage divider" in a way that 1V is across the obove resistor, when 2.7V are across the lower resistor. As raw estimation use: 1k0 and 2k7 resistors.

Klaus