Questions tagged [switching-regulator]

It's a type of voltage regulators that rapidly switch a series device on and off.

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27 views

Good switching regulator for esp32? [closed]

Hi Im planning to design pcb with esp32 chip. Problem Ive run into is power supply. Ill be using esp32 in my car which battery tipically is 13v-14. Linear regulators is to hot to drop that voltage. In ...
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43 views

Considering the inductor in a buck DC-DC converter, how to compute the current through it?

I've been stuck for a few days to the very first point of a lab in which we analyse the behaviour of buck and boost converters. The circuit is built by the university I study in, so there is no acutal ...
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526 views

Switching regulator using MCUs

One of the most useful ability of MCUs is generating PWM signal. For example ESP32 duty resolution can be lowered down to 1 bit in which case the maximum frequency is 40 MHz. With such fast clock ...
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65 views

Swapping of Desktop Voltage Supply with Wireless Charging Module Results in Unexpected Voltage Differences and High Current Draw

I'm trying to power my circuit via a wireless coil module and have a working circuit using a desktop voltage supply at the same voltage (12V). Simply by swapping out the desktop voltage supply with ...
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2answers
51 views

Separating power depending on voltage

I just started working on a computer science project that requires me to do some hardware stuff, but I am a complete noob most of it. For a part of the project I need to be able to forward a current ...
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52 views

Choosing the right capacitors for LM2596

Picture above is from LM2596 datasheet. Is the recommended values is for fixed output voltages? If yes how to choose right capacitor value for variable output? What's the role of Iload in choosing ...
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1answer
35 views

Boost converter output power issue

I have LT1302CN8-5#PBF, fixed 5V DC/DC boost converter. I have built the same circuit as shown in the following datasheet document. (https://www.analog.com/media/en/technical-documentation/data-...
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61 views

Controlling LM2596 digitally

Below schematic is how I'm going to control the output of LM2596: simulate this circuit – Schematic created using CircuitLab I want the output of the LM2596 to be 3-15V and it does exactly ...
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42 views

Confusion about GND and PGND

In a digital circuit like a cell phone. If a switching ic has it’s reference point as PGND, separate from the main GND (4v Main vcc coming from battery), but they’re tied together, then What exactly ...
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39 views

Controling switching regulator digitally

I found this -piece- of schematic which is for controlling LM2596 output with a MCU, and I'm a bit confused: What is the purpose of those two schottky diodes? isn't it causing voltage drop which we ...
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50 views

Selection of Frequency in Switching Regulator

The AD ADP5070 for feeding a low noise amplifier and a 24 bit ADC, can be regulated at two pin selectable frequencies: 1.2MHz or 2.4MHz, accepting an external oscillator in the range 1 MHz to 2.6MHz. ...
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49 views

LM2574-5.0 Voltage Drop by 1/2 v (2.5V) instead 5V

I have a problem with an LM2574-5.0 that only gives me half ( 2.5V instead 5V) the voltage needed when loaded. I looked for a circuit on the net with good filtering, because the circuit will be ...
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235 views

Combining switching and linear regulators

If we have a 12V DC input voltage and we drop that voltage using a switching regulator (LM2596) to 9V and then use a linear regulator (7805) to drop 9V to 5V, what is the output voltage going to look ...
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109 views

How can I layout these regulators to minimize board size and EMI?

I have three switching regulators. A 12V, 5V(green box), and 48V(purple box). The plan is to supply both regulators through -/+12vout pours. If I am trying to minimize board size while also ...
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1answer
96 views

How to terminate unused transformer pins?

What is the correct way to terminate/wire these unused transformer pins? Do they get tied to GND?
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11 views

EP53F8QI Short to GND fault

We have a design with an EP53F8QI that multiple ICs have been burned both at room temperature and +80 °.C. We are using it to create a +3.3V and on fault we have found that the +3.3V supply is shorted ...
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83 views

What did I do wrong with this switching voltage regulator circuit (LM2574)?

I'm new to the electronics world. I've been trying to build a switching voltage regulator circuit using the LM2574N-5G (datasheet) IC. I'm trying to switch 9V (from a 9V battery) to around 5V. I've ...
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45 views

part number of switching regulator component

Can somebody help me to read this component part number? i think its switching regulator. thank you.
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1answer
40 views

Is it possible to use multiple LTM8049 in parallel?

Is it possible to use multiple LTM8049 Dual SEPIC or Inverting μModule DC/DC Converters in parallel in order to further reduce noise, increase output current, and spread heat on the PCB? It is ...
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170 views

Buck Converter dies unpredictably upon connecting power

I made a PCB for an ESP32-based solenoid controller that is powered by a 24V DC Jack. I'm using an AP63205 Buck Converter to step that input down to 5V DC, and then a linear 3V3 LDO to power the ESP32....
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1answer
57 views

Does supply voltage affects stepper motor driver heat dissipation?

Below is a block diagram of a stepper motor controller with an external mosfet h-bridge that drives one of the stepper's coils. Let's say that the coil has 2ohm DC resistance and 3mh inductance, the ...
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3answers
45 views

Calculating Junction Temp of Switching Regulator

I was looking at TI web bench to find a regulator, my question is my calculation is correct and if it is why we have different value on webbench. The IC is TPS565208 P = (Vout - Vin)*Iout => (12-...
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104 views

Choose regulator for 12V to 5V with 3Amp [closed]

I need help on choosing type of regulator base below design requirements Design Spec: Input Voltage = 12V Output Voltage = 5V max Current = 3A Power (12-5)*3 = 21W EX: Without heat sink 60C/W (...
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1answer
118 views

Massive pk-pk ripple on output using isolated DC-DC converter module

I'm having a very odd issue using an integrated DC-DC isolated converter module. As the module stabilizes, a massive pk-pk ripple is developing on both the output and the input. At first we thought ...
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1answer
49 views

Effect of switched regulator drop out

I am designing a multi-voltage (3, 9, 12, and 15) power supply fed with a 18VAC transformer, about 24.5 peak DC source. With the toughest requirements, output 15V at 5A, the 6600uf filter capacitors ...
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1answer
84 views

Linear regulator after switching regulator

I need to power a board that works at 3.3V, and I have a regulated power of 12V. I tried to use a single linear regulator like the TS2940 but the power required is so high that the heat produced was ...
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70 views

Using LM2596 step down with LiPo

i'm doing a project with esp32 (3.3v), dht11(3v-5v), soil sensor (3.3v-5v the cheapest Chinese), nrf24l01 (2.6 - 3.6v). I'm using lifepo4 right now (3.32v) but when the battery drop about 3v, soil ...
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1answer
54 views

Battery Power Density - Voltage Higher than Load Requires or Not?

I'm working on a project that is battery powered where run-time is an important consideration. The project has two distinct required voltage levels, both served from a single battery: 6.4V which ...
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1answer
44 views

Is EN on a switching regulator a suitable for being a main power control?

I am trying to decide where to put the main power switch on a circuit with a Li cell, charger PMIC, and switching regulator. The switching regulator I'm considering (ON semi NCP1522B) has an ENable ...
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32 views

Circuit requirements for 'fixed' output switching regulator

I am considering using one of these switching regulators in a circuit: TPS560430YFDBVR ( output type PWM ) TPS560430X3FDBVT‎ ( output type 'fixed' ) The datasheet for both are the same thing: http://...
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253 views

Designing an effective power supply for embedded products

I'm currently designing several embedded microcontroller products to be powered from a wall outlet. I plan to use wall-wart power supplies to give an input of approximately 5-9V DC but I want the ...
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1answer
40 views

Board mount AC/DC converter design concerns

I'm going to use board mount power supply (IRM-30-12) for first time. It has class 2 protections as per datasheet. Does it really protect my digital circuit in case of Hazardous situations like ...
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64 views

Back powering a switching regulator

It is pretty standard practice to clamp a signal to Vcc by using a diode and resistor. However, when this happens, some small amount if current (maybe ~50mA) is flowing back into the Vcc line. When ...
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148 views

Using a capacitor instead of inductor in a switching regulator, and viceversa

Contextualizing more: In a switching topology, and I am butchering it now, the inductor gets "charged", and eventually will keep an amount of energy "just enough" required for the load. This is ...
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40 views

How to account for the low voltage when designing a Step Down Switching Regulator

Datasheet: http://www.ti.com/lit/ds/slvs569f/slvs569f.pdf Design procedure: **Essentially my question is say I have an input voltage that can range from 7-15V. When designing this converter (must ...
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29 views

(Very Basic) Confused on Reading a Datasheet and Calculating Inductor Ripple Current for a switching Regulator

I am using this component for a project, however, when reading the datasheet I have just become confused about a couple of things. Datasheet : http://www.ti.com/lit/ds/slvs569f/slvs569f.pdf I am ...
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49 views

Regulate 0-6V output

I need to control output from 0-6V at max 1A (~0.8A). Looking at the datasheet for LM25010 it looks I could control R1 and R2 feedback resistors and achieve just that. Is it possible to get that ...
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81 views

Switching regulator not suppressing variance in input?

I am having a little problem with my switching regulator, based on a AP65211A and here is my schematic: Parts: ...
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1answer
363 views

Step down converter design calculation

I am using a Step Down Converterto step down 3.3V to 1.8V with a Load current of 500mA. I have an output inductor of 10uH and 1.2A rated current. I have designed my converter with the help of this TI ...
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2answers
90 views

buck dc dc step down with LT1054C

I built a simple circuit to produce -5V from regulated +5V but it doesn't work unless the voltage is at least +6.5V as input. The LT1054C shoud work ok from 3.5V but I measure 0V at output with my ...
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4answers
173 views

300VDC to 24VDC voltage converter - Cheapest implementation

In an application, 100+, 100W 24V halogen lamps need to be individually controlled and run simultaneously. They stay on for a few seconds at a time and need to have very constant irradiation. ...
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1answer
27 views

Selecting switching regulator components based on cost and performance

I'm designing a PCB which requires 3.3V and 9V power regulation. Eventually I plan on building a fair amount of these boards, so I want to plan my design so I'm able to buy components in bulk if ...
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1answer
163 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 ...
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75 views

Buck/Boost Regulator Problems (TPS63070)

Questions: 1.) Why do input voltages of 9v and higher cause the regulator to output voltages in the range of 1.2v to 2.0v instead of the configured 3.4v if a load is connected to the output when 9v ...
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45 views

Switching regulator high frequency ripple

I've built a switching power supply with a TI 16006Y IC. It seems to be doing its job correctly however I'm having trouble getting rid of the high frequency ripple that occurs for a short period every ...
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1answer
52 views

What is the purpose of a schottky/zener couple on an isolated flyback topology?

This isolated flyback topology has been generated by TI's webench. It's a classic schematics with a feedback going through an optoisolator. There are, however, two diodes connecting the switching ...
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391 views

Feedback in LM2574

I wonder what is the purpose of 'R66' at the feedback terminal of LM2574? I have seen its datasheet but I cannot find info about this. Instead of a single resistor there is a voltage divider shown in ...
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Thermal Faliure of thermal overload protected ICs

I have encountered a number of instances now where ICs that supposedly include "thermal overload protection" will still heat up until they fry. Examples: LM338,LM2576. These devices datasheets ...
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115 views

Help converting PSPICE .lib with multiple subcircuits to LTSPICE

I'm trying to convert an unencrypted PSPICE buck converter model (http://www.ti.com/product/LM2678/toolssoftware) from TI. I translated the top subcircuit based on these steps: https://www.analog.com/...
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2answers
142 views

MC34064 Step-Up Regulator Design

I have a 7.4V battery supply which will gradually discharge and reduce until at about 5V I won't have enough power for my device anymore. Ideally, I need to maintain a 7V (+/- 0.5V) supply rail ...