LM5030: Alternate Part number to LM5030 for the required Input voltage range 8.5 VDC to 15VDC

Bharat Akabari

Part Number: LM5030
Other Parts Discussed in Thread: TIDA-01352, , TIDA-01592, LM3481, LM3524D, LM3488, TIDA-010057, LM25037, SG3524

I have referred following documents so please find my query/comments as under.

TIDA-01352 >> This board is based on LM5030 with push pull topology so noise is very low. It is good design but in my application I am going to operate on 10.8 V Li-Ion battery so Input voltage range is 9-15 Volt but in the TIDA-01352 board LM5030 is used so which will not work on 9-15Vdc. Still if I want to use it then I need to add boost converter and generate 24V from input voltage 9-15 VDC but it will increase one stage so i need to consider efficiency, size, cost so please suggest alternate solution.

TIDA-01592 >> This board is based on LM3481 Flyback topology. I have concern related to noise compare to Push Pull topology so please advice on it.

TIDA-010057 >> This board is based on LM3488 SEPIC but Watt is too low. LM2524D/LM3524D >> For the push pull topology in place of LM5030, LM2524/LM3524 is also seems alternative. I am seeking expert advice considering above points.

Please provide solution of my requirement Vin 8.5 to 15Vdc, Vout 0-50 (Split power supply voltage controllable 2.5 tp 50V ) watt 25 Watt or upto 10W is also but using push pull topology more or less similar to TIDA-01352.(LM5030 is not suitable due to my input voltage range is 8.5 Vin to 15 Vin) with considering high efficiency and low noise.

over 2 years ago

0 Hong Huang over 2 years ago

TI__Mastermind 47475 points

Hi,

For push-pull, LM25037 Vin is 5.5V to 75V so ok to cover your 9 to 15V.

0 Bharat Akabari over 2 years ago in reply to Hong Huang

Prodigy 20 points

Hello Hong,

Thank you very much for the advice. Please suggest appropriate transformer and if possible then please share some circuit diagram or Application note to meet my requirement as posted.

0 Hong Huang over 2 years ago in reply to Bharat Akabari

TI__Mastermind 47475 points

Hi,

You need to provide your converter specs so I can take a look, if you want me to make suggestions.

0 Bharat Akabari over 2 years ago in reply to Hong Huang

Prodigy 20 points

Above detail is already given now please inform what else spec I need to share with you.

0 Hong Huang over 2 years ago in reply to Bharat Akabari

TI__Mastermind 47475 points

Hi,

Is your Vout from 2,5V to 50V?

what is your switch frequency spec?

0 Bharat Akabari over 2 years ago in reply to Hong Huang

Prodigy 20 points

Yes, I wanted voltage controlled output voltage and that to be selectable from + 2.5VDC to + 50VDC. Around 500Khz switching frequency seems ok still you please advice.

0 Hong Huang over 2 years ago in reply to Bharat Akabari

TI__Mastermind 47475 points

Hi,

As your input voltage minimum is 8.5V compared to TIDA-01352 24V, the transformer turns ratio for TIDA-01352 Np:21Ns = 1:7.5, then yours should be Np:Ns = 1:(7.5 x 24/8.5) = 1: 21.2. Other parameters can be similar to TIDA-01352 transformer 750343547. If you want to make an optimal transformer, you would have to design it by yourself, or send your transformer specs to a transformer vendor.

0 Hong Huang over 2 years ago in reply to Hong Huang

TI__Mastermind 47475 points

Hi,

I noticed your max Vout is 50V while TIDA is 150V. So the transformer of TIDA-01352 can be used for your design without change the turns ratio.

0 Bharat Akabari over 2 years ago in reply to Hong Huang

Prodigy 20 points

Hello Hong,

Ok so it means I need to go ahead with LM25037 and transformer to be 750343547. Now please clarify if I want to use SG3524 in place of LM25037 then is it ok ? or I need to go ahead with LM25037 only. If so then why ?

0 Hong Huang over 2 years ago in reply to Bharat Akabari

TI__Mastermind 47475 points

Hi,

You were asking the substitution of LM5030. LM25037 is my suggestion to you to replace LM5030 to meet your input voltage range 8.5V to 15V.

I think you need to make decision on other differences and possible changes associated.

0 Bharat Akabari over 2 years ago

Prodigy 20 points

Hello Hong,

Can we bypass internal regulator and use (LM5030) down up to 8.5 voltage ? If yes then it would full fill my requirement of the input voltage range.

0 Hong Huang over 2 years ago in reply to Bharat Akabari

TI__Mastermind 47475 points

Hi,

You can refer to the datasheet section 7.3.1, you can tie VIN and VCC together then feeding external 8 to 15V to that node.

0 Bharat Akabari over 2 years ago in reply to Hong Huang

Prodigy 20 points

Hello Hong,

Thank you for support. I was expecting application level support from TI and not just discussion.

0 Hong Huang over 2 years ago in reply to Bharat Akabari

TI__Mastermind 47475 points

Hi,

if you have additional questions please ask directly. It is basically your design. We just provide answers to your questions.

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LM5030: Alternate Part number to LM5030 for the required Input voltage range 8.5 VDC to 15VDC