BUCK-CONVCALC: Suggest a buck regulator that bypasses input to output when Vin <= Vout

Ignacio Majcherczyk

Part Number: BUCK-CONVCALC
Other Parts Discussed in Thread: TPS62932

Tool/software:

Dear forum

I'm working in a solar panel regulator that has to reduce the solar panel voltage from 21V open circuit and 17.5V (MPP) to 15V

my idea is to use a DC/DC buck converter, but this converter has to bypass the input to the output

when the input voltage gets equal or less than the output voltage. (and to start switching again when vin > vout)

Can you suggest me a TI part/s with that characteristic? The current output needed is 2A max

Thanks in advance

Ignacio

over 1 year ago

0 Tahar Allag over 1 year ago

TI__Mastermind 32370 points

Hello,

Are you looking for back boost solution? what is the current levels and Max VIN?

thanks

Tahar

0 Tahar Allag over 1 year ago in reply to Tahar Allag

TI__Mastermind 32370 points

here is selection guide for buck boost solutions.

https://www.ti.com/power-management/acdc-dcdc-converters/products.html#1129=Buck-Boost&238max=7%3B30&

0 Ignacio Majcherczyk over 1 year ago in reply to Tahar Allag

Prodigy 170 points

Hello Tahar

I'm looking for a buck converter. Max current is 2A but with a very generous margin. By the application that my client has in mind (solar panel pre-regulator) I think the operation will be quite below 1A, in the 600-700mA range

Max Vin 21.5V, MPP Vin 17.5V, Vout= 12V

Cheers

Ignacio

0 Tahar Allag over 1 year ago in reply to Ignacio Majcherczyk

TI__Mastermind 32370 points

OK, let me assign this to our Low Current team for further help

0 Tahar Allag over 1 year ago in reply to Tahar Allag

TI__Mastermind 32370 points

Hello Colin,

can you please look into this request from low current portfolio?

Thanks!

Tahar

0 Colin Chen over 1 year ago in reply to Tahar Allag

TI__Mastermind 21161 points

Hi Tahar,

Thank you for taking me here.

For this requirement I would suggest TPS62932 for use with below features:

Input Range: 3.8V- 30V, ABS=32V
Output range: 0.8V to 22V or 98%*Vin
Adjustable switching frequency by RT pin: 300kHz-2.2MHz
80-mΩ and 30-mΩ MOSFETs
Quiescent Current at 12μA(typ)
Peak Current Mode Control with Internal Loop Compensation
0.8-V ±1% Reference Voltage(@TJ=25°C)
Adjustable Soft-start
Min./Max. On-Time: 70 ns / 7 μs, Minimum Off-Time: 140ns
Trim Option for Eco-mode/OOA mode/FCCM mode*
EMI Friendly with Frequency Spread Spectrum Function
SOT-583 (8) Package(1.6mm x 2.1mm)

Thanks

Colin

Power management

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BUCK-CONVCALC: Suggest a buck regulator that bypasses input to output when Vin <= Vout