TLV272: 3dB frequency

Jamie Shaffer1

Part Number: TLV272
Other Parts Discussed in Thread: OPA145, TLV9044, TLV9042

I am looking for the 3dB frequency, at which the gain of this amplifier begins to decay as it shows in Figure 12 of the datasheet. I understand the unity gain to occur at 3MHz, and the slope to be -20dB/dec. The figure only goes to 10Hz and is still rising. Where is the corner frequency?

I also understand this part is deprecated and not recommended for new designs. I would like to change to a recommended part, but for now I just need to finish a simulation model.

over 2 years ago

+1 Caro Walter over 2 years ago

TI__Mastermind 18617 points

Hey Jamie,

I would like to recommend you a newer part that TI has existing models for. Please share the system requirements.

To answer your question:

The DC data is shared in the datasheet:

For model purposes I would place the pole at 1Hz or 10Hz.

All the best,
Carolina

0 Jamie Shaffer1 over 2 years ago in reply to Caro Walter

Prodigy 220 points

Carolina,

My regional AE recommended the OPA145 as a replacement for the TLV27x. The device will function as a voltage error amplifier in an analog voltage control loop for a switch-mode power supply. The key requirements are just that it function on a 3.3V rail with rail-rail output capability and low noise, ideally in a standard TSSOP or SOIC package. I need at least two channels but I would like 4 to enable design flexibility. The loop crossover frequency is <10kHz, so the bandwidth does not need to be especially high.

0 Caro Walter over 2 years ago in reply to Jamie Shaffer1

TI__Mastermind 18617 points

Hey Jamie,

I believe that TLV9044 would be a great fit, there is even current stock available in SOIC:

The TLV9042 (2 channel variant) is available under the Design Tools & simulation tab portion of the product page: https://www.ti.com/product/TLV9044#design-tools-simulation

I also recommend looking at the difference amplifier cookbook circuit to help with your application.

All the best,
Carolina

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TLV272: 3dB frequency