LME49600: What is the closed loop gain of the LME49600 Evaluation Board design?

Edward Tsui

Prodigy 30 points

Part Number: LME49600
Other Parts Discussed in Thread: LME49720

Hi Expert,

Referring to the design of LME49600 Evaluation Board design.

1. What is the new closed loop gain after DC servo has applied? What is the formula of closed loop gain calulation?

2. How to do compensation (Such as Cf compensation) to ensure stability for such complex circuit?

over 6 years ago

0 Edward Tsui over 6 years ago

Prodigy 30 points

0 Ivan Salazar over 6 years ago in reply to Edward Tsui

TI__Guru* 95335 points

Hi Edward,

There are no equations or further documentation for these LMEx devices.
LME49600 is part of the feedback loop of LME49720. The gain is set by R2, R4 and R6 for left channel as explained in data sheet.
As explained in LME49600 data sheet it is stable under any capacitive load.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Edward Tsui over 6 years ago in reply to Ivan Salazar

Prodigy 30 points

Hi Ivan,

Thanks. But what is the gain equation of this circuit? We all know that the gain of non-inverting amplifier is 1+R4/R2, but what about the circuit with dc servo loop??

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LME49600: What is the closed loop gain of the LME49600 Evaluation Board design?