Questions tagged [buck-boost]
A non-isolated DC-DC converter topology
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Powering an ESP32 from a 1s LiPO
Beginner here. I would like to power an ESP32 (3,3V) from a 1s LiPO and I would like to combine LTC2954-1 Pushbutton On/Off Controller (https://www.analog.com/media/en/technical-documentation/data-...
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Buck-boost output drops when loaded
The LTC3566, a PMIC intended for battery and USB supplied applications, integrates a battery charger, a power path and a buck-boost converter. For my board, I copy-pasted the schematic found on the ...
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Is this buck/boost layout good?
I have this PCB layout with two TPS631011 buck/boost converters. I just wanted to know, whather thelLayout is good or if there is anything I should change before manufacturing this board.
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Undersupplied LM2576 buck-boost converter: Prevention, and where is all the power going?
I had an LM2576 (ADJ variant) lying around and tried building a buck, and then an inverting buck-boost converter, purely for academic purposes. I have next to no prior experience with converters (or ...
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Trace width for 14VSON high current buck-boost converter
I am doing a pcb layout, where I am using TPS63020 buck-boost converter to output 4V from a varying source of 3 to 5 volt. The required peak current of my circuit is 2A (GSM Modem eats the most).
Here ...
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Constant output voltage in buck-boost converters
I'm a self-taught student. I'm trying to understand the working principle of buck-boost converters in continuous conduction mode.
When the switch is turned on, the equation describing the inductor is ...
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Voltage regulation for backup battery power circuit
I am building a GPS tracker where I need to have the option to drive the device from an external power source up to 40 V and have an internal 3.7 V backup battery.
My GSM Modem (Quectel M66) needs 4 V ...
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Automobile 12V UPS circuit with Li ion battery
Currently I have a battery backup circuit for a GPS device to run on automobile power source and I am trying to improve a few things. Any help is appreciated.
Currently I am facing issues of negative ...
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Reliable battery power converter for ESP32 [closed]
I have seen similar (but just similar) questions here, so I decided to ask anyway.
What is a buck-boost module, preferrably from Aliexpress, that I can use to power an ESP32 with 3.3 V from a 3.7 V ...
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Why inductor don't discharge completely even when the duty cycle is 50%?
1] My simple buck convertor circuit description
I made this buck convertor on my breadboard- Falstad simulation
The battery voltage is 12 V
And the MOSFET is a N-channel enhancement mode MOSFET
The ...
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Closed Loop Buck-Boost converter, no load condition
My question is how can I close the loop with no load condition of my buck-boost converter, by using peak limiting current mode control? Is the bleeder resistor needed or is it possible just to close ...
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Is there anything wrong with doing a buck then boost converter instead of a buck boost
I was trying to find a buck-boost converter that can do 5A with a voltage input range of 12 and a output range of 5-20 for usb pd. I found that if I did a buck then boost converter the price for both ...
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Current sensing in DC-DC converter
I studied DC-DC converter in peak/valley/average mode control and I have a question about the methodology to sense the current in average current mode control. I saw lot of paper about DCR sensing but ...
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Troubleshooting Voltage Sensing Issues in Buck-Boost Chip Simulations
I performed a simulation on a buck-boost chip (LT8390). I understand that the sensing resistor placed between LSP and LSN is supposed to sense the differential voltage. This voltage is then amplified ...
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Is a buck-boost converter good enough as circuit protection for an automotive application?
I am designing a circuit for a automotive application that requires a stable regulated 12V supply. The supply in turn must be powered by an automotive battery.
I am currently looking at using a ...
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Using Buck-Boost as LED driver
I am trying to use a buck-boost controller like LT8390 as a LED driver. This controller can act as a current controller if the current through sensing resistor connected to (ISP/ISN) can be adjusted. ...
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Enable/Disable Power of Board with ESP32-S3
I am using TPS63001 Buck-Boost Coverter with a 3.7 Li-Ion Recharable battery. I want to Control Power of the board with ESP32-S3-Mini. Enable pin of the TPS63001 is connected to MCU and its also ...
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Sensing Resistor in Buck-Boost controllers
In the LT8390, there are two sensing resistors. The one connected to LSN/LSP is called RSENSE(Buck), and the one connected to ISP/ISN is called RSENSE(BOOST). To illustrate this more clearly, I've ...
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Peak current-mode controller
I am studying a peak current-mode controller, and here is the schematic without slope compensation:
Before introducing RSENSE to the design, I understood that if feedback voltage increases, it is ...
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Why doesn't the polarity of the inductor reverse in this buck-boost?
Given the buck-boost below
Fig. 3.33, page 62 from Fundamentals of Power Electronics 3rd edition by Robert W. Erickson and Dragan Maksimovic
If we assume the transistor is in conduction mode and the ...
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FET selection and quantity for buck-boost converter design
I am working on designing a buck-boost converter where the input voltage is 24 V regulated, and the output voltage ranges from 12 to 48 V with a current rating of 5 A. The design should also allow for ...
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What is an intuitive explanation on how a buck and boost converter transfer energy?
I can understand how a buck converter can step down the voltage but only with the formulas. I am struggling to understand intuitively how the inductor stores energy and releases it in a way so that ...
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Feedback compensation on a buck-boost led driver
I tried to calculate the compensation network for a TPS92692 in buck-boost topology and I can't find the same value for the typical buck-boost led driver (page 41 of datasheet).
Section 9.2.2.2.12 ...
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Possible noise from tps63020(buck converter) that is affecting audio MAX98357
I'm pretty new to the engineering but I hope this will be an easy question for those who have done much job in this area.
So I'm making my own pcb that consists mainly of esp32-s3, 2x tps63020 (3.3 ...
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Non inverting buck boost transfer function
When considering the compensation of a non inverting buck boost (single inductor), the datasheet considers to take into account the worst transfer function between the buck transfer function and the ...
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Can I supply two different voltages with the same boost converter?
I have a VFD matrix display that needs both 90V and 70V to power on. I already designed a boost converter that will give me the 90V.
I was wondering if I can just put a voltage divider at the output ...
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Adjusting Output Voltage of a DC-DC Boost Converter controlled by STM32 PWM
I'm building a boost converter from scratch and am planning to use an STM32 microcontroller to generate a PWM signal to regulate the output voltage. The power supply voltage of the circuit is 24 V, ...
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Buck Boost Charge Capacitor Balance
For a buck boost capacitor charge balance, I am curious if adding equation 11.7 and 11.10 is correct? Or is this the average inductor current?
From: Erickson & Maksimović (2001), Fundamentals of ...
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Switch Selection in Buck-Boost Controller Designs
I have reviewed several buck-boost controller designs, including the LT8390 nd I am puzzled by the selection of different switches for the buck and boost sections. For instance, on page 27, the ...
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How to understand MAX25431 datasheet on inductor selection?
I am trying to design a project featuring MAX25431 buck-boost converter.
After examining the datasheet I started the part selection for my application, but I have troubles understanding few details:
...
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Seeking a very low cost buck boost 3 V or 5 V to 3.3 V [closed]
I am seeking an SMPS chip for ARM/LoRa PS circuit which needs to use every drop of energy at 3.3 V from a pair of LR6-AA batteries (3V) or use 5V USB.
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How to get a stable 3.3V/2A output out of a single cell (18650 Li-ion) battery?
In my tiny quadcopter, I need to power a long range wifi card which take 3.3V/2A max as input. The quad runs off a single high current 18650 Li-ion battery.
Are there any chips or modules that will ...
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Identification of IC used in Pololu 5V, 5A Buck Converter (my2101 330)
I have identified the chip on the Pololu 5V, 5A buck converter as my2101 330, but I am having difficulty finding information about this chip on any platform. I've checked the Pololu resources page (...
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TL494 Based buck boost converter not working properly
I was working on the buck-boost converter using the TL494 IC. The requirement is 5-50V output 10A fs=70k approx, Vin=15V. Initially, I had used a PMOS irf9450 for the switching. The simulation worked ...
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Not able to get enough current from buck boost (sepic) converter made using TL494
I am trying to build a buckboost converter for converting 5-40v input to 5-35V output at 3A max to use it for many purposes by usign TL494. I am using a SEPIC topology as i want a non inverting output....
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Boost mode doesn’t work properly for a syncronous non-inverting buck-boost converter
I posted a related question 5 days ago. I fixed the capacitor position the same as the datasheet recommendation of the gate driver by making it connect Vb with Vs, also the one who answered my ...
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Using alkaline C cells to drive a pair of solenoids
I am working on a walking robot for my class in mechanical engineering. I have two 12 VDC solenoids that need to be actuated. Their resistance is 4 ohm so basically will require 6 amps @ 12V for the ...
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Charging IC for a 1S or 3S Li-ion battery
I have quite specific problem; I'm designing a PCB for my robot, that is used the main board for controlling motors, gathering data from sensors, etc.
The whole PCB will be designed as a Raspberry Pi ...
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TI synchronous buck converter went up in smoke, where do i start?
I’m using a TPSM63606RDLR power module device. Everything looked perfect for multiple days, but yesterday it started smoking. I did move the PCB and there are some LED strips connected externally to ...
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FET turn-on time in DC-DC converter
I am selecting a GaN FET for a buck-boost DC-DC converter application. The Vgs of the part I'm looking at combined with the gate charge and gate resistance lets me switch the FET on in about 5.3 ns. ...
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Boost Current and Limit Voltage
I have a radar gun which has a serial interface. The gun reports the velocity out to the serial port. I want to attach a microcontroller (ESP8266/ESP32) to the serial interface and forward the ...
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Forward biasing of diode bridge in a discontinuous mode operation of a three phase buck-boost derived power factor corrected converter
In this paper, they said that during mode 1 the diode bridge is forward biased because the output capacitor voltage is greater than peak line to line voltage but during mode 2 they are forward biased. ...
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Peak current limit and valley current limit of inverting buck-boost converter
I am trying to understand, in a inverting buck-boost converter, why the peak current in the inductor should be smaller than the high-side current limit and valley current in the inductor should be ...
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BD8306MUV and idle current
I need to generate 3.3 V from a 3.6 V battery to power a sensor. I choose the Rohm buck-boost converter BD8306MUV for that, but I discovered that it consumes nearly 5 mA of current in idle mode ...
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Can you power 2 voltage rails simultaneously using a buck-boost converter?
I am designing a custom PCB and want to power 2 rails: a 3.3V and 5V rail, with a single 250mAh LiPo battery (3.7V) and need the 5V rail to have as stable a voltage as possible.
I understand that a ...
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Low power circuit design for powering an e-paper display
This is a follow up to my last question on Low power circuit design for turning an LDO on/off at specific voltage levels, where I wanted to find a low power way to turn an LDO on/off at specific ...
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Boost converter gets hot
I'm building a LCD backlight power supply boosting 5 V to 12 V.
The max current draw from the panel is 12 V 0.4 A.
I am using LMR60214. But the IC is getting hot to touch at full brightness.
I am ...
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Buzzing ringing in boost converter regulator when using PWM in lower duty cycle
I designed a boost converter using TI LMR62014XMF, to convert 5 V to 12 V for using as backlight source in my LVDS display adapter.
The LCD display panel needs 12 V at 0.5 A max for backlight driving.
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Why is the output voltage (without capacitor) of a boost converter seen as a perfect square wave?
I am trying to learn about boost converters, but I don't understand why the images of the voltage output always seems to be like a square wave PWM. I understand that assuming perfect inductors, the ...
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What technical progress enabled high-efficiency charge pumps?
I found a lot of information on the internet, most of which told me that charge pumps are only suitable for low-power scenarios and they are not very efficient.
Charging ICs based on the charge pump ...
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