Current sense transformer in full bridge smps can't work with just 300mV reference voltage?

[Flyback]

Page 14 of the LTC3723-1 datasheet says that a current sense transformer can be used with the LTC3723-1 PWM controller...however, the voltage reference on the current sense input is only 300mV....surely this is too low for the output of a current sense transformer, and really we would like at least 1 volt here?

LTC3723-1 datasheet
http://cds.linear.com/docs/en/datasheet/372312f.pdf

 

[crutschow]

Page 14 of the LTC3723-1 datasheet says that a current sense transformer can be used with the LTC3723-1 PWM controller...however, the voltage reference on the current sense input is only 300mV....surely this is too low for the output of a current sense transformer, and really we would like at least 1 volt here?

LTC3723-1 datasheet
http://cds.linear.com/docs/en/datasheet/372312f.pdf

If you want a higher voltage just use a voltage divider at the input.

 

[ronsimpson]

The output of the current transformer is a function of input current, turns ratio and load resistor. You can change the load resistor.
I don't know of a lower limit on voltage out except the usual noise concern.
There is a upper limit on voltage in that you will hit VT saturation on the core.

 

[NorthGuy]

As I remember, the phase error of current transformer increases with the size of burden resistor, so to get better results it is good to use smaller burden resistor which will naturally produce smaller voltage. If you use shunt resistor instead, it might be hard do come up even with 300mV.