All Questions
59
questions
1
vote
1
answer
524
views
Buck Converter design, which is better? 48V->12V direct conversion or 48V->24V->12V conversion for 12V application
I am designing a 1KW DC-DC buck converter with Vin(51V battery pack with Vnom = 48V) for driving four 250W motors. Is it advisable to step down the voltage directly from 48V to 12V or should I first ...
0
votes
1
answer
57
views
Determining \$I_{peak}\$ and \$f_{min}\$ and \$f_{max}\$ for MP4569 buck IC
Trying to figure out what inductance value is needed for my application of MP4569.
They give the minimum inductance value in terms of \$I_{peak}\$ (page 12):
\$L_{MIN}={{V_{IN(MAX)}{\times}t_{ON(MIN)}}...
- 825
0
votes
0
answers
34
views
Constant Voltage Power Supply
I’m working on a project were I need to power to some 24V 4-20mA sensors, a 3.3V ESP32 and a 5V SIM808 module.
To accomplish this I’m using a step-down buck converter to reduce a 12V electrolytic ...
- 11
2
votes
2
answers
593
views
Limiting input voltage for buck converter
I want to power some micro controllers and a couple of leds on my electric bike, counting up towards 5 Amps.
Power supply is a 36V battery, with a range of about 42V to 33V. This voltage is to be ...
- 43
1
vote
2
answers
265
views
MCP16301 fail on power up - Vin shorted to Vout
I have designed a step-down converter PCB (4-layer) with MCP16301. It converts voltage from 24V to 5V.
When I connect it to power source and then connect a 100ohm resistor (50mA@5V) it works normally....
- 13
3
votes
2
answers
199
views
One step-down regulator 24 V to 1V or two step-down regulators with lower steps?
I am trying to design a working principle scheme to step-down the input voltage from 24Vdc ---> different low voltages (1.8 V, 1 V, 1.5 V, 3.3 V with ripples ~ 1%).
Could you kindly explain me the ...
- 59
1
vote
2
answers
875
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Using LM2596 step-down with Li-po
I'm doing a project with an ESP32 (3.3 V), a DHT11(3-5 V), a soil sensor (3.3-5 V, the cheapest Chinese), NRF24L01 (2.6-3.6 V).
I'm using LiFePO4 right now (3.32 V), but when the battery voltage drops ...
2
votes
1
answer
1k
views
Will a buck converter allow current to pass through if Vin is less than the configured output voltage?
In general, will a buck converter allow current to pass through if Vin is less than the configured output voltage?
Specifically, I'm reading the TPS54308 datasheet and I'm not seeing an answer to my ...
- 245
2
votes
2
answers
2k
views
Is it possible to convert 19.5V 3.33A to 12V 5.5A?
I have a laptop charger which has 19.5 V 3.33 A output. I want to use it for raspberry, which needs 5V and 2.5A and for monitor which needs 12V 3A. Is that charger strong enough to run the whole ...
1
vote
0
answers
207
views
DC-DC buck output voltage
I am designing a DC-DC step-down converter (asynchronous) and I would like to achieve a Li-Po charging with it (18 - 22 V input voltage). My goal is the CC/CV charging but to do this, I need constant ...
- 31
0
votes
1
answer
107
views
Correct power supply for my project
I am making an autonomous bot where i need to power a few sensors (IR, PIR, sonic,etc) and an arduino. In total the sensors draw about 300 mA current(max).
My power supply is a LIPO of 12 V (11.1 V),...
- 151
0
votes
2
answers
328
views
Current relationships across a voltage step down convertor
This question arose from a conversation over the weekend and we tied ourselves in knots trying to get to the bottom of it. I didn’t have time to put a simple circuit together so it would be great to ...
- 105
0
votes
3
answers
4k
views
high current buck converter?
I am in the process of building a power bank with 18650 batteries for a trolling motor. The nominal voltage for this battery is 14.8 V. The motor specs are 12 VDC - 45 A max current draw.
Now the ...
- 61
2
votes
3
answers
2k
views
How does using a DC-DC step down converter save power?
I understand how DC-DC buck converters save power when compared with a linear regulator, but do they save power when compared to not using power conversion all together? In my specific case, I have a ...
- 639
0
votes
2
answers
641
views
Step down from USB (5 V) to 4.3 V for battery dummy
I have a camera for which I bought a dummy battery to connect it with power bank or other power source. Original battery is 3.6 V Li-ion so I need around 4.3 V but the USB (from powerbanks) is 5.1 V ...
