LM20242: What is internal VREF startup time?

Ronald Wang

Intellectual 390 points

Part Number: LM20242

Dear Sir,

What is LM20242 internal VREF startup time?

Please see attachment file red box.

Thank you.

Best regards,

Ronald

over 6 years ago

0 Robert Blattner over 6 years ago

TI__Expert 6215 points

Hello Ronald,

I am forwarding this request to our LM20242 expert, Arief

0 Ambreesh Tripathi over 6 years ago in reply to Robert Blattner

TI__Expert 6860 points

Ronald ,

When the device is enabled , An internal current source (ISSC = 5 µA) charges CSS and generates a ramp from 0 V to VFB to control
the ramp-up rate of the output voltage. Hence during start up , the error amplifer reference wil be the voltage on the SS cap and once it exceed 0.8V , the internal reference takes it over .

Ambreesh

Power management

Power management forum

LM20242: What is internal VREF startup time?