TL783: Adjustable Regulator TL783

Hi Druilhe,

The VI-VO min voltage is basically the dropout voltage, and is dependant on the load current and temperature.
Figures 1 and 2 give various values for this depending on the load current and temperature.
Figure 10 gives you the dropout voltage vs temperature.

Thanks,

- Stephen

Hi Druihe, 

I saw you rejected the answer. Please let me know if you have any concerns or there is a way for us to address your question differently. 

Regards, 
Jason Song

In simulation,

If I do not set 21V at the input of this assembly, it does not work. The minimum voltage of VIN = 20V or 21V  for a Vout = 10V

In your site VIn min 20V

www.ti.com/.../products.html

HI Jason Song

I did not receive a return following my last questions. Thanks for your help

Hi Druilhe, 

The simulation model may have incorrect information that requires Vin - Vo > 20V for the part to operate. If your load current is less, you could have lower Vin-Vo, but in order for the part to stay in regulation, this Vo-Vi needs to be higher than the dropout. 

Regards, 
Jason Song

Hi Jason Song

In your site VIn min 20V.

I suppose when Vin is less the regulator is not correct ?

Hi Druilhe, 

I don't think the requirement for the 20V minimum Vin for this device is true. I am ordering some samples and I will take a look on the bench. Please allow 3 business days for the parts to arrive in our lab. 

I will get back to you by Thursday. 

Regards, 
Jason Song

Jason Song

You do not answer the question what is the minimum voltage at the input of the regulator before "stalling". See below

7.3 Recommended Operating Conditions you don't give the VI-VO Min

In this document Vin_min 20V it 's correct ???

Regards

YD

Hi YD, 

Sorry that I cannot see the pictures, VI-VO does not have to be higher than 20V. For the 7.3 in the datasheet, it does not specify the min of VI-VO. Will you upload your 2nd picture or point me the chapter number?

Regards, 

Jason Song

Hi Jason Song

Vin (Min) 20V

I repeat my question

what is the minimum voltage at the input of the regulator before "stalling". See below

Hi Druilhe, 

I would say Vin min on our spec table in the LDO search page is wrong. Vin could be lower than 20V based on the current load, Vin needs to be higher than Vout + Vdorpout. 

Regards, 
Jason Song