dear TI partner,
as we know ,TL783 can operate uder voltage from 1.25 to 125v, it is excellent in positive output voltage.
but my customer want to design a circuit that vin is -100v and vout is -110v by tl783,output current is about 20~30mA,can you tell me how to design the schematic.or do you have other better solution?
thank you.
Dear Jason,
below is my customer's negative application schematic,please refer.
in this application,vin is -110v, vout is -100v, vin connect to GND, vout connect to -100v, formula is Vfef/R16=(-HV-(-HV_IN))/(R16+R21+R22)------> 1.25/180=10/Radj------>Radj=1.44k------>R22=1.44k-1.2k=0.24k;
Certainly, in fact R21 and R22 is a adjustable resistor, by adjusting the resistor,we can adjust the output voltage.
this schematic can output -100v voltage, but when we add load to 10mA, the output voltage is not stable, output voltage is about -60v~-100v,can you help check the schematic and give a better schematic?
thank you.
Hi Cickey,
You can find more details from the datasheet: http://www.ti.com/lit/ds/symlink/lm137.pdf
When you are picking up the right LM devcies for your application, you may find this information helpful.
The x = 1 is positive and x=3 is negative.
Regards,
Jason Song
