Dear Sir/Madam,
My requirements.
Vin = 5V
Vout = -5V (required), +/- 3%
Iout = 50mA
I have chosen TPS63700 IC for generating negative voltage from positive voltage and suitable for battery application.
The application circuit as shown in Figure 2. should be sufficient for my requirement. But doing the design calculation for inductor selection I get the following values,
Average L Current = 125mA,
L Ripple current 20% = 0.2* 125mA
= 25mA
L Value = 72.4uH
L Ripple current 80% = 0.8* 125mA
= 100mA
L Value = 18uH
The inductor value suggested in the datasheet does not match. Kindly clarify which value to use, since the difference are high.
