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ATL431: the measurement of Open Loop gain and Closed Loop gain

Hirotaka Matsumoto
Guru 27525 points
Part Number: ATL431
Other Parts Discussed in Thread: TINA-TI

Hi all

Would you mind if we ask ATL431?

<Question1>
On the datasheet P9 "Figure 25. Test Circuit for Phase and Gain Measurement", this circuit is for the measurement of Closed Loop gain.
Is our recognition correct?

<Question2>
On the datasheet P6 "Figure 10. Small-Signal Voltage Amplification vs Frequency", is this test result of Open Loop gain measurement?
If it is the test result of Open Loop gain measurement, could you let us know the circuit of measurement circuit

<Question3>
In relation to <Question2>, could you let us know how you measured Open Loop gain or the measurement circuit?

<Question4>
We recognize that you measured Open Loop gain measurement using the device was characterized by your design team
So, it is not possible to simulate using TINA-TI, right?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Mastermind 24485 points
    Hello Matsumoto-san,

    1. Yes, this test circuit is a closed loop gain measurement.
    2. Figure 10 is the result of the closed loop measurement taken with the schematic from figure 25.
    3. We do not show any open loop measurement results for this device, Figure 10 is the result of the measurement from Figure 25.
    4. We do not have an AC model for the ATL431 available, only the transient model. However, the transient model should show where the device is unstable.

    If you are concerned about the stability of the device with different load capacitances please refer to Figures 14 through 21 corresponding to the gain and cathode current settings for your device.

    Best,
    Michael