SMPS Power Supply Ref Design

Amit Mane

One of our customer needs below mentioned Ref Design for SMPS : Input Voltage : 380 to 430 V Phase to Phase Output Voltage and Current : 5V, 3A Isolational : (Optional) Let me know if you need any more details. Regards, Amit Mane

over 14 years ago

0 Hong Huang over 14 years ago

TI__Guru 74115 points

Is the input voltage (380 to 430V) ac or dc?

0 Amit Mane over 14 years ago in reply to Hong Huang

Intellectual 500 points

Input voltage is AC Phase to Phase (Three Phase)

0 Hong Huang over 14 years ago in reply to Amit Mane

TI__Guru 74115 points

So the design is 3-phase input (380 to 430Vac) and single dc output (5V and 3A), and isolation is optional, right?

0 Amit Mane over 14 years ago in reply to Hong Huang

Intellectual 500 points

Yes.

Input Voltage : 3-Phase, 380V to 430Vac.

Required :

Output Voltage : 5Vdc.

Output Current : 3A.

Isolation : Optional.

Thanking You.

0 Hong Huang over 14 years ago in reply to Amit Mane

TI__Guru 74115 points

I could not find a reference design to be used directly in your application. Here are some design ideas.

As the input is 3-phase ac, a 3-phase rectifier should be used to obtain dc voltage. Then a single-ended forward dc-dc converter can be used to step down the rectified dc to 5V. As there is big voltage difference from rectifier to the dc output, a transformer should be used no matter the isolation is needed or not. The transformer turns ratio can be set up to make the duty cycle in reasonable range. A simple dc buck converter cannot be used due to the big voltage difference from the input to the output, which makes very small duty cycle and most likely no controllers can be found for that small duty cycle.

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SMPS Power Supply Ref Design