Questions tagged [voltage-regulator]

A voltage regulator is an analog circuit that produces a stable output voltage that doesn't vary with input voltage or load changes. Switching regulators are much more efficient than linear ones.

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Open-drain output using N-channel MOSFET in addition to pull-up resistor

I'm trying to understand a design in an evaluation board and I need some assistance. In the above schematic, the PG output pin is open-drain so it requires a pull-...
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Increasing Power Line Voltage to Reduce Current?

I need to deliver 5V, 1A (5W) of power to a load that's 5+ meters away from the power source, however I'm keen to use small-ish wires and connectors, which I know will result in volt drops through the ...
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Where to connect the heat sink / body of SPX29300 voltage regulator?

I have gone through the datasheet of SPX29300 and did not find anything related to the body / heatsink connection. I know that most of the heat sinks are connected to ground. However, what confuses me ...
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24V to 5V step down voltage regulator with LM2678

Reference: https://www.ti.com/lit/ds/symlink/lm2678.pdf I have constructed the circuit above attempting to step down the DC voltage from 24V to 5V. But I keep getting 8.3V as the output voltage. It is ...
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Output voltage of a step-down voltage regulator (or buck converter)

I've the following step-down regulator: and I'm wondering how to get the following formula for the output voltage: $$ V_{OUT} = \frac{T_{ON}}{T_{ON} + T_{OFF}} \, V_{IN} $$ I calculated the current ...
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Digitally adjusting AC voltage for a motor

Basically I have an extraction fan motor that runs full speed at 230V, at 130V it runs around half the speed. The original chip allows switching between few voltages (and therefore, fan speeds) upon ...
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Zener diode not regulating capacitor voltage

I am trying to harvest energy from a stepper motor by turning its shaft with my hand. Since it is a 2 phase motor, I rectified both phases and connected them in parallel to get more current, then a ...
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Why is an inductor rather than a capacitor used to smooth switch mode regulators

I understand (at least at a high level) how to use both capacitors and inductors to reduce noise but I don't understand the advantages/disadvantages of each approach or why one is chosen over the ...
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Series voltage regulator with Zener diode and BJT - equations to explain the working principles

I'm studying the following series voltage regulator, and I'd like to know how to "prove" the last two sentences by using equations. For example, in the case of the 2nd sentence, the first ...
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Determine the min/max resistance of an SMD variable resistor

I want to determine my minimum and maximum resistance rating for my variable resistor but failed to find the relevant information in the datasheet (this might be an issue more 'noobs' might have, ...
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Average voltage in PWM?

I have a doubt regarding average PWM voltage. Let's take a buck convertor with Vin=10V, Vout=5V. With this we can determine the duty cycle of PWM needs to be 50%. Thus means the MOSFET of the buck is ...
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DC/DC Converter not outputting the correct voltage

I have the following circuit for the LT3463A regulator: https://www.analog.com/media/en/technical-documentation/data-sheets/3463f.pdf I started testing the board, for the negative voltage I was ...
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Bobcat 300 helium miner

Can someone help me identify this burnt component on Bobcat 300 helium miner. It seems to be some kind of voltage regulator?
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3.7 to 3.3V regulation

I want to power up my ESP32 with LiPo battery. LiPo Battery has voltage between 3.7 to 4.2V and ESP32's operating voltage range is 2.2 to 3.6V (but I want it to be 3.3V) and it consumes around 600mA. ...
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Is there a good way to insulate the backplate of a 7915 voltage regulator?

Didn't realise this when I purchased it, but apparently voltage regulators come in two different housings: I.e. one that has a metal backplate connected to the input pin and one with a non-conductive ...
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How should I use this voltage regulator for best efficiency? [closed]

I want to design a low power battery powered PCB. My battery has a voltage of 3.6V. Suppose there are 3 ICs in the circuit and one of them is powered with a max 3.3V. Power loss of voltage regulator ...
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ATX PSU load sharing and failover design

I'm trying to arrive at a solution for lower cost ATX power supply which will supply about 250W, has two separate inputs each capable of supplying the full load in case of failure/disconnection but ...
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Using Jfet as constant current source to drive a BJT

The circuit diagram below shows two simple voltage regulators, one of them is driven by constant current source using a Jfet and the second one also providing a constant current because the voltage is ...
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What capacitor do I need for an AMS1117-3.3 regulator?

I want to use an AMS1117-3.3 regulator to power an ESP32D chip that will consume 1A. The regulator will be powered by a 5V 1A supply. 5V at the regulator input to 3.3v at the output. How many ...
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2 votes
3 answers
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How to power two ESP-01S chips from 220 V AC [closed]

I would like to supply power for two ESP-01S microcontroller chips. I am a beginner with such kind of circuits. There are some constraints: The only available power source is 220 V AC, so I need an ...
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Need help identifying SMD IC

I have a Network Video Recorder, Chinese one, NBD8016S-XC v2.03. I think it had an electrical shock after power outage, just want to try to repair it. I have found the IC that is burnt, but can not ...
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Transistor voltage regulator circuit - question about voltage output control

For the purpose of learning electronics I am trying to reverse engineer old Olivetti typewriter. I got to the point where I can understand most things on the board, but one part is still can get ...
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Capacitor selection with current rating for switching regulator

The example design parameters in the TPS54332 datasheet are as follows: In the input capacitor selection section, the values confused me. Selected capacitors parameters are 10uF, ceramic X5R, 25V, ...
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Different types of ceiling fan speed controllers

I have a new Hunter ceiling fan that came with a 4 speed wireless controller built in, including a 5uf capacitor and a 10uf capacitor inside. I removed the wireless controller and wired the motor ...
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How does a switching regulator behave if its input is equal to its output?

I want a switching regulator (eg LM2596) set to 5v output voltage to work with 5V - 36V input voltage. I know regulators have min dropout voltage. So how does it behave in such a case (Vin=5V when ...
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Can a voltage stabilizer with an offline UPS give the same performance as an online-UPS? [closed]

I have a 5.5 kVA offline UPS backing up a Bewoulf cluster. It works fine during a complete loss of grid power, but when the grid power flickers the cluster shuts down. Assuming that this is because of ...
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What happens if input current of 2A is given to a L7805 rated of 1.5A?

I have used a L7805 to regulate a 12V to 5V where the regulator is rated of 1.5A and the input that I am providing is of 2A. The regulator gets hot. The only solution I found is to increase the width ...
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Using a 5V voltage regulator with a 5V input

I am building an application for the TMS3705 transponder base station IC with a PCB. The datasheet specifies it needs 5 volts as input power in order for the system to work: I want to supply this ...
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Battery supervisor circuit question

I am working on a digital watch just for fun and learning. It is powered with a small "3.7 V" LiPo and the 3.3 volts for the primary circuit will be supplied from "3.3v Voltage ...
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Designing A Circuit To Light An LED When Voltage Drops Below Threshold

I'm a beginner with designing circuits and I'm attempting this because I'm trying to design my first PCB. The basic idea is that I have a 12V battery as a power source and I want an LED to light up ...
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Can I power my microcontroller system directly from a 3V lithium coincell (transient consideration)?

My device has to be powered with user replaceable 2032 coincell. I have a ~3.3V microcontroller like nrf52832. Its datasheet says: So lithium coincell voltage range (3.3V - 0V) is in operating ...
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Connecting two voltage regulators in series to get higher voltage

Say I have 2 solar panels with slightly different ratings with ~36 VDC 8 A. I assume there is a voltage regulator with 18 VDC output, so I connect two 18 VDC voltage regulators and later try to bring ...
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93 views

14-Volt 6-Amp Power Supply Stability

Design Requirements: The purpose is a linear DC power supply for 12-volt aircraft, marine, and amateur radio equipment power source 20 volts @ +/-10%. (output 85W = 6A*14.2V) Rser on V1 = 0.4 or ...
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Voltage divider, linear regulator, other options to power proportional HV DC-DC converter?

I have a EMCO AG15P-5 DC-DC converter (datasheet) that takes 0-5V in and outputs up to 1.5kV (proportional to input voltage). I need to operate the converter at 500V output. I've done testing with a ...
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Switching regulator voltage issue after rework

A switching regulator (TPS63030) on my power management board is showing a weird problem after I opted to re-adjust the voltage output. Note that this particular board has been used successfully in ...
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12VDC 3500mA filtering, what are voltage regulators and capacitor values [closed]

I have a 12VDC 3500mA power supply and I would like to filter the outgoing voltage from any noise. My plan is a simple scheme: output from the power supply -> capacitor -> voltage regulator ->...
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Help identifying 632A switching regulator

Help me identify this IC. Marking says 632A SCT 14C This must be switching voltage regulator, but I could not find the information about it.
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Multiple A/D Converters reading from the same sensor in a race car

I have a production based race car and my goal is to log the outputs of some OEM sensors used by the Engine Control Unit with an aftermarket data logger without risking any impact to the OEM function. ...
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1 answer
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Buck converter coil selection (Coilcraft vs Bourns)

I am using the SCT2331 (a clone of the Diodes AP63200, with 400KHz switching frequency instead of 500KHz). The design works with an inductor from Coilcraft (LPS3314-103), but when I try a different, ...
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TV Hisense HLE4815RT not tuning cable signal

I have a Hisense TV HLE4815RT (mainboard: RSAG7.820.5649), that suddenly stopped tuning cable signal, it just says "No signal". I tried different cables, removing some splitter, ...
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1 answer
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First PCB layout but can't validate yet [closed]

I'm learning some basic circuitry with an ESP32 Dev Kit and copied some schematics online to connect the ESP32 to external power, a relay and an input reed switch sensor. My problem is I'm still ...
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1 vote
1 answer
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Why my ESP32-CAM won't power up with 5 volts?

I'm new into electronics and I decided to power up my ESP32-CAM with a 9V battery instead FTDI programmer (I measured it, it gives 5V to ESP32-CAM). I thought if I reduce voltage to 5V with mini ...
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What type of regulator to use for LEDs in a scale model vehicle?

I'm building a 3 ft scale model of a Peterbilt truck with high detail to include multiple 3mm colored LEDs. What type of regulator for differing 2 to 3.2 volts can I use? Yellow LEDs 2 - 2.2 volt Red ...
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Need help identifying this ldo pinlayout

I have this regulator in sot package measures 4.5mm x 2.5mm xy, The layout is 1-out, 2-in(together with the undersidepin), 3- ground. I believe this is a 3.8v regulator, i want to find a compatible 3....
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Help with voltage doubler in a WPT application

I need some help with this schematic to have higher voltage at Vrect. This is for charging a receiver at 25 mm in a WPT application. I was expecting a voltage of 2Vin at the output of the voltage ...
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Constant Voltage / Constant Current / Current Foldback Regulator Evaluation

I am a semi-retired EE in electrical distribution, so op-amps are not in my tool bag, and I could use some help. It has been over 30years since I last worked with them, and I need help from someone ...
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How to regulate 5V 3A to 3.3V for ESP32 and level up 3.3V to 5V on a PCB?

I'm making my first custom PCB with an ESP32-WROOM-32E. I am following this tutorial for the ESP32 part. My project requires a 5V 3A power supply but the ESP32 only takes 3.3V. The tutorial uses an ...
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Ai Thinker ESP32-CAM max input voltage

What is the maximum input voltage on the Ai-Thinker ESP32-CAM? I'm asking because the official docs specify a max input voltage of 5.25V, however it has an AMS1117 power regulator which has a maximum ...
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Voltage regulator equation

I'm designing a circuit using this buck regulator (AOZ2253TQI-20) from Alpha & Omega. Data sheet here, http://www.aosmd.com/res/data_sheets/AOZ2253TQI-20.pdf The data sheet doesn't specifically ...
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how to map 1V - 10V to 1.6V to 3.2V for voltage regulation using TL494

I am trying to design the given circuit where pin 1 is the non inverting terminal of comparator where I want to use a ref voltage of 1V - 10V but IC TL494 is accepting a voltage of 1.6V to 3.2V....and ...
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