LM2670: Need DC-DC converter

Bhukya Venkanna

Part Number: LM2670
Other Parts Discussed in Thread: LM70840, LMR36520

Tool/software:

Hi Team,

Good day!

We are currently developing a new project and I would like to request your assistance in suggesting a DC-DC power supply converter circuit suitable for the following application:

Input Voltage: +24V
Output Voltages: +15V and -15V
Output Current: 1.5A for both voltages (1A-2A range is acceptable)

Note: Please share the complete circuit with all components and their values.

Thanks,

Venkanna.

9 months ago

0 Ridge Lahti 9 months ago

TI__Mastermind 22300 points

Hello,

The LMR36520 (max 1A for each output) or the LM70840 would be good starting points for your design.

Please use this application note as a reference: https://www.ti.com/lit/an/snva790a/snva790a.pdf?ts=1733944374303&ref_url=https%253A%252F%252Fwww.google.com%252F

There is a section which describes how to achieve a negative secondary output as shown in Figure 2-2.

Best regards,

Ridge

0 Bhukya Venkanna 9 months ago in reply to Ridge Lahti

Prodigy 10 points

Thanks Ridge.

The LMR36520 IC has max current is 2A, but can you suggest me 1A rated IC's for 24V to +5V conversion plz?

Venkanna.

0 Bhukya Venkanna 9 months ago in reply to Bhukya Venkanna

Prodigy 10 points

Actually our application will consume max 500mA current only for +24V to +5V conversion.

Venkanna.

0 Ridge Lahti 9 months ago in reply to Bhukya Venkanna

TI__Mastermind 22300 points

Hi Venkanna,

The LMR43606 is a good starting point: https://www.ti.com/product/LMR43606-Q1

Best regards,

Ridge

0 Bhukya Venkanna 9 months ago in reply to Ridge Lahti

Prodigy 10 points

Hi Ridge,

Could you please suggest a suitable DC-DC converter along with a complete circuit for the following specifications separately?

SNO	Input Voltage	Output Voltage	Output current (Actual)	DC-DC converter IC max load rating
1	+24V	+15V	0.5A	0.75A-1A
2	+24V	-15V	0.5A	0.75A-1A
3	+24V	+5V	0.8A	1A-1.5A

Note: We are looking for an low cost alternative part/IC's for above requirements on priority.

Thanks,

Venkanna.

0 Ridge Lahti 9 months ago in reply to Bhukya Venkanna

TI__Mastermind 22300 points

Hi Venkanna,

You can use Webench to select different devices and see example circuits based on your chosen operating conditions.

Here is a link to the tool: https://webench.ti.com/power-designer/

Best regards,

Ridge

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LM2670: Need DC-DC converter