TPS54140: compensation of TPS54140

Liya Yang

Part Number: TPS54140

I have one question about the compensation of voltage loop.normally,we will use the compensation that one end connects the output of error amplifier and the other connects the reverse input, but for TPS54140, one end connects the output and the other connects the ground?? why connects ground? can you help me?

over 6 years ago

0 Samuel Jaffe over 6 years ago

TI__Mastermind 25590 points

Liya,

Figure 54 uses a transconductance amplifier which has a current out which interacts with the grounded resistor/capacitor network to compensate the device. This is another way of achieving compensation.

-Sam

0 Liya Yang over 6 years ago in reply to Samuel Jaffe

TI__Prodigy 40 points

i search some information for transconductance amplifier, I know its'expression of input-output is iout=gm*vi, but for adding some capacitors or resisitors in amplifier's out for compensation, how to input it's input-output expression?? is there some guide books i can refer to ?

0 Samuel Jaffe over 6 years ago in reply to Liya Yang

TI__Mastermind 25590 points

Liya,

Here's a good article from digikey.

-Sam

Power management

Power management forum

TPS54140: compensation of TPS54140