# Questions tagged [boost]

A non-isolated DC/DC converter topology which outputs a voltage higher than or equal to the input voltage.

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### Boost Converter Efficiency Input Current

I'm trying to learn about DC-DC Boost converters and with the help of WEBENCH I've made this circuit: Parameters are: Vin: (4.95 - 5.05) V Vout: 17 V Iout: 300mA Efficiency: 95.2% My main questions ...
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1 vote
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### Output voltage for synchronous buck converter and synchronous boost converter

I'm reading a book named The Art of Electronics, third edition. The book says: Just to give a taste of some of the tricks that you can do with inductors, take a look at Figure 1.52. Although we’ll ...
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### Why am I getting a low output voltage (5.98V instead of 12V) from a LM2623 stepup converter?

I'm working on a project using the LM2623 boost converter, where I aim to achieve a 12V output. I'm only getting around 5.98V at the output. I've double-checked my circuit and measured the voltage at ...
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### How does this LM317 current boost circuit work? [closed]

Can someone please explain how this circuit works, as well as explaining the roles of each component in the circuit? What is the effect of the 500ohm resistor and the resistor on the right side of ...
1 vote
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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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### LT3757 - Boost converter

I have 3 simple question regarding the LT3757 ic. I don't know how many amps it gives from the gate pin ? The only information about the gate is given below. I need to know it so that I can select my ...
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### How can I calculate the value of L and C for a boost converter operating in DCM mode?

I already know that the value of the inductor for a DCM mode should be any which is smaller than the value required for critical conduction but out of the range. How could I decide which value would ...
74 views

### AC-DC power supply vs 3.7 V Li-Po battery

Can someone please help me to figure out how to replicate the power you get from a 3.7v Li-Po, but from mains power? A DC motor, powered directly with a 3.7 V Li-Po battery draws between 400 mA and 1....
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### MT3608 output voltage changing with input voltage

I recently made a small PCB with two MT3608 step-up converters on it, which are powered from a battery. I have two of them. One is for 5V and one for 3.3V. Here is the problem: When I power the ...
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### How does the HV supply of the MightyOhm Geiger Counter work? 555 Astable mode

Geiger counter page Full Sch PNG I know a bit about boost converter design, so Q1 switching on and off from the output of the 555 timer makes sense to me. What doesn't make sense is how the 555 ...
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### DC-DC Boost Converter: Can't see switching waveform/ does not boost

I've designed a boost converter to drive a LCD backlight. I'm at the stage of testing the boost converter now. I've used AP3031. I've set the circuit so that the current drawn will be 160mA. This was ...
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### Variable switching duty cycle for buck converter even if input voltage and output load is constant

I am testing a BUCK converter and observed that has a variable DC when supplied at input voltages lower than 9.5V (if input voltage is higher than 9.5V the BOOSTER stops and DC is constant). The BUCK ...
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### Why is this boost converter bypassed?

In my project, the input power of a device comes from a battery pack. Here it is: Here is a simplified architecture inside the battery pack: There is a charger that charges the battery when V_IN is ...
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### Identify IC marking LCSZ

Can everybody help me IC LCSZ such as picture below
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### Boost converter two different voltages (9v/12v) from 3.7v battery, attach both to battery, or daisy chain off 9v

I'm sure this has been answered plenty before but I cant seem to get the search terms. I'm wanting to use a 3.7v battery to power a small 9v device and a 12v device at the same time using a boost ...
1 vote
52 views

### Need help with identifying a SMD part

Can anyone please help in identifying this SMD part marked with "CP6W"? This is part of the power supply of a 8 inch tablet from China, "Chuwi Hi8 pro". My findings as of now are: ...
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### Creating a 12.6 V 3S Lithium-ion Charging Circuit from 5 V USB-C

I have some questions about what is considered standard for a charging circuit, as this is something I have not much experience in. I am constrained to the following: 3S lithium-ion battery of 2600 ...
42 views

### Difference between MPPT charger and MPPT boost converter

I am quite confused regarding the MPPT charger and the MPPT boost converter. I have a hybrid inverter where I have a boost converter circuit at the beginning with inputs from the PV. The output of it ...
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### Switching Current Vs. Output Current - Boost Converter

I used the MIC2288YD5-TR (datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/MIC2288-Data-Sheet-DS20006034C.pdf) for a project to power a MQ2 gas sensor. The input voltage was 3.7V-4.2V(...
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### Pressure resistant boost converter

I was tasked to integrate a 48V tool (a brush, so basically a DC motor + some control electronics) on our 24V sub-sea robot for a short demonstration. We aim for depths of 100m (10 bar). The brush ...
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### How to calculate Rslope for MAX25611

There isn't much information for calculating Rslope. THe only equation that includes Rslope is Vslope, which is being differentiated. Unsure how to approach this, as I seem to require it for my ...
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### TPS61088RHL high ripple noise on normal operation

I have been working with one project which require 12 V power supply with at least 1.5 A current. I used TI Webench power designer tool to create simple 5-10 V input and 12 V 2 A output design. Since ...
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### Zero Voltage Switching (ZVS) in Conventional Full-Bridge DC/DC Boost Converter

I am trying to design a Conventional Full-Bridge DC/DC Boost Converter with the following parameters (I am not sure if you need them); Input voltage: 24 V (DC) Output voltage: 400 V (DC) Output ...
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### Boost converter does not work according to the theories

I am still a beginner in this field so I would like to gain some insight about boost converters. I wanted to build a boost converter for a school project with this simple design. The parts were ...
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### LTspice AC/DC converter with DC/DC boost converter

So this is my first time using LTspice and I need to convert my (AC) Vin 11.5V to DC and then boost DC voltage to Vout 22.5V. I have a few givens and some I needed to calculate. I am struggling to ...
1 vote
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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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### Constant current feedback op-amp analysis

Above is the schematic for the convoy XHP35 flashlight driver. As you can see, the current control loop uses the op-amp as a comparator between a setpoint (low-pass filtered PWM output from a ...
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### Voltage drops when trying to get high current from boost converter

I have designed a Boost converter which boost 5V input to 12V output. I designed it using TPS61378 boost converter IC by Texas instruments. I was able to get around 450mA current from the output ...
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### How can I improve the feedback portion of my boost converter circuit?

I designed this boost converter to drive vacuum florescent displays, nixie tubes, and similar devices. It can drive a 10k Ohm load at 235V. I'm sure I can get away with larger loads as alot of the ...
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### Op amp as a comparator output turning partially high when it's supposed to be low

I'm using an AD823 op amp, as a comparator as part of a feedback loop in a boost converter. Although the boost converter and feedback portion functions as desired, the problem is when I check the 13 V ...
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### Can one CC boost LED driver be used for 2 different loads separately?

I have a constant current boost LED controller (TPS92691) which I am designing to output 4A switching between two LED strings. This is with a 2S lipo battery. One string has a stack forward voltage of ...
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### Does a current sense resistor not always mean a constant current output for dc-dc converter?

I've had a understanding that having a current sense resistor feeding into sense pins or a feedback pin meant that the inductor current was changing wrt the variations across sense resistor, hence ...
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### Apart from MOSFET selection what else determines max output current for LED controller IC?

TPS92691 is a LED controller, not a monolithic IC which has an integrated FET. Hence, I'm curious why the landing page for this part (https://www.ti.com/product/TPS92691) mentions that Iout(max) is 5A ...
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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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### Trouble matching the theoretical results with the LTspice simulation of a boost converter

I want to boost from 12 V to 13 V, this got me the duty cycle D = 0.076. This is my boost circuit: And this is my result in steady state: The green line is the load voltage. Why doesn't it even ...
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### Creating higher voltage from DC motor

I have a DC motor (5 V, 600 rpm). I use it as a generator. It produces near 1.5 V max. This voltage may differ while using it in the application and I can't control it. I want to raise this voltage to ...
136 views

### How does $R_{ISET}$ work in this Boost Converter?

I'm trying to design a boost converter for a backlight which has Vf:10.6-13.6V, If:140mA I picked AP3031, I did steps required to find component details e.g Inductor Value, Iswmax So far I understand....
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### LT1308 or other IC? [duplicate]

I am trying to power a microcontroller with a single coin cell battery. The MCU consumes around 15 µA or 1.2 mA (depending on if the power LED is kept on) in power save mode. I found the LT1308 to be ...
1 vote
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### Confirming Application of LT1308

I am intending to power a small microcontroller off a coin cell battery. The microcontroller consumes as little as 15 microamps. I have a couple questions: Just confirming, will the IC work with such ...
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### Will my gate driver work for this situation?

This is my own design, I did a gate driver for the MOSFET. Would this design work, or should I instead use a gate driver IC?
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### What is the easiest way to turn 1 kV DC to 10 kV DC?

What is the simplest method for me to take quick 1 kV DC pulses, and turn them into 10 kV DC pulses or higher? What might my circuit look like? Edit to provide more detail: Water rolling down a short ...
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### Does current mode control for dc/dc conv imply a constant current output?

I am getting very confused, I have read articles about current mode and voltage mode control, and it seems that most converters use current mode control - which seems has two nested control loops. The ...
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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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### I'd like to apply voltage to the charging module with the converter I made

I would like to implement a charging system as a graduation project. But I found that the logic of charging the battery pack is not that simple. So I want to charge the charging module by applying ...
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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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### Between direct FET, boost, and stacked LDOs with current sink, what's the best way to switch b/w 2 high power loads?

I have a 2 strips of 3 high powered LEDs as the loads. The load is hooked up as : Config 1 Strip 1 : 3 Green LEDs (3.3Vf, 4A) in series => 4A and 13.2V load Strip 2 : 3 Red LEDs (2.8Vf, 4A) in s in ...
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### For a high powered LED loads, is a buck or boost converter more efficient / simpler?

I have a 3 high powered LEDs hooked up into a strip to for the load. For simplicity, I am going with a constant voltage driver. The load can be hooked up in 2 configurations: Config 1: 3 Green LEDs (3....
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### Single Source Boost Converter?

I'm trying to power a 5v microcontroller using a 3.6v rechargeable lithium cell. My plan is to do this using a boost converter circuit. However, boost converters (at least from my rudimentary ...