LM706A0-Q1: transient regulation out of 5%

Hi,

I would suggest the following steps:

1. Can you please populate the quick start calculator and see the PM with the components selected?
2. Can you please check if the below mentioned output capacitor condition is met

Thanks,

Pramanik Patel

Hi Pramanik Patel,

Sorry, I don't know how to send PM to you so I just upload the quick start information to forums.

I follow default EVM design only change FPWM mode by jumper.

Could you please help me confirm below design can meet transient 5%, thanks.

BTW, I have trying to add polymer cap 270uF to Cout, but the transient still out of 5%.

Hi,

Please give me some time I will get back to you soon.

Thanks

Hi,
When you apply load step output changes from 3.532 to 3.496 which is just 1%, right and this is below your required overshoot spec.

Jay Lo said:

Fs: 300Hz , Max Vout : 3.532V (deviation 6.08%), Spec:3.496V

Please correct me if I am wrong.

Thanks

Hi Pramanik Patel,

Our mean Vout : 3.3296V, the measurement Max Vout : 3.532V , Max Vout Spec : 3.496V.

So the deviation 6.08% can be calculated as below.

(3.532V-3.3296V)/3.3296V=6.08%

Thanks.

Hi,

I got it. Can you please confirm what are the ratings of the output caps? Since the caps tend to derate when DC is applied so the marked value may be 270uF but in real you may not get 270uF (but a cap value less than that). 

Thanks,

Pramanik Patel