UCC28740: Can you please provide the spice file for this part?

Collin Argo

Prodigy 40 points

Part Number: UCC28740

Tool/software:

Looking for the LTspice / spice file for part UCC28740QDRQ1. Thank you for your help!

Collin

over 1 year ago

0 Hong Huang over 1 year ago

TI__Guru 74115 points

Hi,

This device does not have the PSpice model. It has only the Simplis model which can be downloaded from ti.com.

www.ti.com/.../slum672

0 Collin Argo over 1 year ago in reply to Hong Huang

Prodigy 40 points

Is there a similar part you can recommend that does have a spice file? Thanks!

0 Hong Huang over 1 year ago in reply to Collin Argo

TI__Guru 74115 points

Hi,

All similar parts have Simplis model but no one has PSpice model.

0 Collin Argo over 1 year ago in reply to Hong Huang

Prodigy 40 points

Okay, I just installed the free verson of Simplis, but when I open the UCC28740 model I get the following error message:

*** ERROR *** (UCC28740_TRANS_SIMPLIS.net;58): Decryption failed: Unable to decrypt the data.

How do I solve this issue?

Thanks!

0 Hong Huang over 1 year ago in reply to Collin Argo

TI__Guru 74115 points

Hi,

The model requires to run on full version of Simplis. The free version does not support the model to be functional.

0 Collin Argo over 1 year ago in reply to Hong Huang

Prodigy 40 points

Can you provide a quote for (2) installations of the Simplis full version? Thanks

+1 Hong Huang over 1 year ago in reply to Collin Argo

TI__Guru 74115 points

Hi,

Please contact the Simplis vendor. TI does not make Simplis sale.

0 Wenting Wu over 1 year ago in reply to Hong Huang

TI__Intellectual 2355 points

Are there some other tool can simulate BODE plot instead of the excel table of UCC28740 in TI.COM? The excel table seems not correct. Even I put TI sample circuits spec into excel table, the BODE plot still is worse.

Best regards,

Wenting

0 Hong Huang over 1 year ago in reply to Wenting Wu

TI__Guru 74115 points

Hi,

No, as I know.

0 Wenting Wu over 1 year ago in reply to Hong Huang

TI__Intellectual 2355 points

Hello Expert,

Do you mind helping to check the schematic attached? The customer and me try to use EXCEL to simulate BODE plot but it seems our tool is not correct. I input example circuit to the EXCEL tool and the result is wrong.

1、输入电压范围为48V~120V直流输入，输出电压DC-24V。

2、需求常态带载功率为15W，最大带载功率为36W。

3、期望工作在CV模式，若芯片必须进入CC模式，则最低电压要求大于20V，最小CC电流可以设定大一点

4、后级负载上电时会有5A左右的随时峰值电流，不知道会不会对限流保护有影响。这个值需要关注一下

5、部分参数如表格所示，MOS和光耦为我们现在使用的实际参数，如果不符合要求也可以更改

Best regards,

Wenting PW05_V1.0_20240718 _ 01 POWER.pdf

0 Hong Huang over 1 year ago in reply to Wenting Wu

TI__Guru 74115 points

Hi,

Please provide your excel design sheet to help check your design.

5A initial current will make CC operation but can also slow down the aux voltage or cause UVLO off.

0 Wenting Wu over 1 year ago in reply to Hong Huang

TI__Intellectual 2355 points

ucc28740 sluc487b.xlsx

0 Hong Huang over 1 year ago in reply to Wenting Wu

TI__Guru 74115 points

Hi,

Your feedback does not seem follow the excel sheet.

C40 in your design is very small. How did you get this small value. The UCC28740 feedback loop is quite easy but your schematics show random numbers somehow.

C40 should be over 100nF or higher which is critical for stability and phase margin based on various design. UCC28740 Type II design is fairly simple wit C40 over 100nF critical.

C16 is too big.

Please follow the excel sheet for your initial design unless you can explain why your feedback components picked up like that you show in the circuit.

Power management

Power management forum

UCC28740: Can you please provide the spice file for this part?