REF5050: PSpice for TI cannot simulate -5V using REF5050

LEO_0916

Part Number: REF5050
Other Parts Discussed in Thread: REF5010,

I am a newbie in power supply design. I need dual power supplies in the circuit in Figure 1.
I need a voltage reference of +-5V because I want noise below 4uV and a high precision voltage source.

So I follow "Tips and Tricks for Designingwith Voltage References" manual (Figure 2.) to simulate the circuit.

But I used PSpice for TI to try to simulate the circuit and found that I couldn't simulate the voltage of -5V, what am I doing wrong?

Figure 1.

Figure 2.

over 2 years ago

0 Trailokya Rai over 2 years ago

TI__Genius 11111 points

I will check and confirm.

Regards

Trailokya

+1 Trailokya Rai over 2 years ago in reply to Trailokya Rai

TI__Genius 11111 points

There are couple of convergence issue in the spice model . Please try below schematic -

Replace one 20V supply by two 10V supply in series.
Schematic is not converging when VIN is directly connected to GND terminal. Hence add 100u ohm resistor. It will start working.

I have simulated REF5010 with below circuit.

Let me know if you have further questions.

Regards

Trailokya

0 LEO_0916 over 2 years ago in reply to Trailokya Rai

Prodigy 130 points

Thank you~ By the way, so I don't need to add 0.0001 ohm resistor and series voltage in the physical circuit design, right?

+1 Trailokya Rai over 2 years ago in reply to LEO_0916

TI__Genius 11111 points

No. You don't need to add 0.0001 ohm resistor in physical circuit.

Regards

Trailokya

0 LEO_0916 over 2 years ago in reply to Trailokya Rai

Prodigy 130 points

Sorry, I add a question, the voltage I simulated is distorted and the REF has a significant voltage drop, is it because the circuit requires more current than the REF5050 can provide?, or am I mistaken.