TPS7H5001-SP: TPS7h5001

Knute Ray

Part Number: TPS7H5001-SP

How do you make the OTA a gain of 1? In SIMPLIS I want to get the response with H(s)=1. Do you put a resistor to ground on the output?

THanks.

over 1 year ago

0 Sarah Koch over 1 year ago

TI__Expert 7115 points

Hi Knute,

Is this to perform stability analysis?

This Application Note may be useful to you as it shows the main components of the transfer function: Demystifying Type II and Type III Compensators Using OpAmp and OTA for DC/DC Converters

The Error Amplifier transconductance (EAgm) can be altered in the model netlist. I believe this is accessible by pressing F11.

Thanks,

Sarah

0 Knute Ray over 1 year ago

Prodigy 230 points

It's for a transfer function with the H(s)=1. I don't want to change the transconductance. I want to make the amplifier a follower without any compensation components.

0 Sarah Koch over 1 year ago in reply to Knute Ray

TI__Expert 7115 points

I'm not sure I completely understand what your goals are, could you elaborate? The gain of the OTA is the Error Amplifier transconductance (~1800 uA/V nominal value). I don't typically see OTAs used in a follower configuration so I'm not sure I understand what this would achieve. Are you wanting to observe the open loop response?

Thanks,

Sarah

0 Daniel Hartung over 1 year ago in reply to Knute Ray

TI__Mastermind 22155 points

Hey Knute,

We can continue this discussion in our email thread, but see the following recommendation from our design team:

Connect VSENSE to ~0.6V to ensure the EA is not driving too much current at COMP
Add a pull-up resistor from COMP to VLDO. Something like 300uA to overdrive COMP (Rpullup=VLDO/300uA=16Kohm).

If you have any other questions feel free to email me.

Thanks,
Daniel

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TPS7H5001-SP: TPS7h5001