Questions tagged [switching-regulator]

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

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16 views

System level behavioral model for PSSR of a switching regulator

In a design I have a switching regulator (buck for the sake of my example). The switching frequency is much higher than the frequency range of interest and can be safely ignored. However, the input ...
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55 views

Switched capacitor ladder is semi-stable but sometimes oscillates

With no load (once it starts up) the converter is stable up to about 75kHz but if I put a 30ohm load on it the gates start to oscillate horribly and I get severe shoot through, to the point the the ...
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52 views

Loose connection leads to an uncontrolled load transient for LM2596 output

Recently I started going up with the LM2596 input voltage. Initially, I was using 12V INPUT, but the requirement raised to a minimum of 24V and max 36V. I noticed a spark while plugging in the input ...
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44 views

Soft Start in switching regulator

Preface: I am designing a drone. My choice for stepping down voltage is to use a DC/DC switching converter. After using the parametric search of Digi-key, I selected TPS54495RSAT‎ as my SMPS. ...
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1answer
64 views

Sense resistor placement in switching regulator

Preface: I am designing a drone. My choice for stepping down voltage is to use a DC/DC switching converter. After using the parametric search of Digi-key, I selected TPS54495RSAT‎ as my SMPS. ...
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1answer
59 views

Can we add a current limiter circuit to LM2576 fixed voltage version?

I know I can add an external current sense and comparator circuit to the feedback pin of LM2576-ADJ version to limit current, but can we make such a modified arrangement to a fixed version of the ...
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4answers
177 views

What type of regulator to use? (switching or linear)

I would like to know what type of regulator is better to use in this scenario: (What is best way to convert 15V to 5V 200mAmax with lowest ripple) Vin: 15 V from isolated DC-DC converter (RS6-0515S ...
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1answer
75 views

How to digitally control the feedback of a switching regulator using digital pot? [updated]

I'm trying to build a digitally-controlled power supply using ordinary LM2596 or equivalent ICs and a microcontroller. the first approach was by using the DAC or a filtered PWM DAC the way this module ...
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3answers
52 views

How to get sufficient current out of two parallel DC/DC power supplies?

I have two RT8299AZSP (24V adjustable DC/DC switching regulators) chips connected in parallel. They are each rated for 3A, and provide the power to drive a high power UV LED (can't say too much about ...
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1answer
108 views

I have a height problem (with my switching regulator on a height constrained PCB)

I was planning to use this part (datasheet) (basically MC34063 with thermal shutdown,) but I don´t have enough room above the PCB. I need to keep the components under 2.2mm. According to my ...
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44 views

Where is the origin pole in my CM buck SIMPLIS ac simulation?

I know that current mode buck regulators are generally stable as long as they're actually operating in current mode (i.e. the inductor ramp current is large enough to prevent slope compensation from ...
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127 views

Buck converter unstable output voltage

I am trying to use an AP6507 to power a Raspberry Pi from a 12V battery. In the datasheet is written that it should provide a continuous current of 3A, but when I try to power the Raspberry Pi, the ...
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46 views

How to supply an OLED module with 13V?

I have an OLED module that uses 3V for logic signals and 13V for the LEDs. What is the common way to drive the 13V for OLEDs? With a regulator or some kind of special LED driver? I have seen some LED ...
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2answers
136 views

Output current effect on inductor value selection for SMPS

Working on designing a power supply based on the TPS5403 SMPS. Datasheet here: https://www.ti.com/lit/ds/symlink/tps5403.pdf Datasheet is different than what I'm used to. Previous SMPS I've ...
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66 views

Even when the enable Pin is low, Im getting voltage on the output

Hi, Im using TPS53353DQPR to generate 3V3 from 12V0. Even when the enable pin is low , there is around 2.5V on the output. I removed FB5, still there is voltage on output when enable is low.I tried ...
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65 views

understanding inductor parameters when choosing inductors

I need a voltage regulator to drive an OLED display with 13V/ 50mAmp. I have 3.3 Volt to feed it with. I am thinking of using this boost regulator (because it is cheap): regulator This regulator(...
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1k views

Why is main ground and circuit ground explicitly separated here?

ST L4971 Switching Regulator is the part in question. Figure 1 and 4 both show similar schematics, with Figure 4 being the diagramme as per their evaluation board. The input capacitor C1, the diode D1,...
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37 views

LTC3115 component selection for schematic

For my project I am using the LTC3115 Buck-Boost converter (datasheet) that should provide an output voltage of 8 V and 700 mA with a switching frequency of 2 MHz. The input voltage range is 3.2 V to ...
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1answer
40 views

LTM4625 Regulator

I am using LTM4625 Step-Down DC/DC µModule Regulator.VIN:12V and Vout:3.3V @5A. My circuit draw 2.9A current from LTM4625. Does my regulator hot? How can I calculate regulator's heat? https://www....
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80 views

Will the frequency of a switching regulator have an effect on a microcontroller?

Will the switching frequency of my switching regulator have an effect on my microcontroller? I'm trying to power this microcontroller PIC32MZ0512EFE144-I/PH with a switching regulator from 24V to 3.3V....
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42 views

Regulate higher voltage for mcu and tracking pre-regulator

I am currently designing a lab bench power supply using the LT3080. It will have an input of 18V and an output of 0-15V and 1A. I am going to use an Atmega328 to control the limits and a display. For ...
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1answer
70 views

Switch node ringing: How does high side MOSEFT turn on time affect the ringing amplitude?

I was trying to understand the ringing in buck converters during turn on. The following equivalent circuit model was found in a website link. My doubt is: How does the turn on delay of the switch ...
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85 views

How to reduce sinusoidal ripple output coming from SMPS?

I have an SMPS producing output of 12V,1Amps. It is giving a voltage ripple (I am not sure if ripple right term for this) as given in image. I donot have permission to make any changes to this SMPS ...
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1answer
48 views

Noise on LT1624 with shutdown function

In the circuit bellow, based on an LTC1624, with the SHDN input low, the Ith/RUN pin is extremely noisy, with spikes dropping way below the 0.8V shutdown threshold. As a consequence, the circuit can't ...
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1answer
61 views

Is there a chance that a DC/DC controller was damaged when a bad feedback network caused its output to exceed its absolute max limit?

I'm currently debugging an issue with a DC/DC controller. The part is a LTC3833. It turns out that the engineer who was working on this accidentally pointed to incorrect part numbers for the passive ...
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1answer
68 views

Capacitor on output of regulator causing short circuit

We were using switching regulator and when we turned on the regulator short was found. C285 was damaged. After removing C285 , regulator worked without any issues. We were suspecting inrush current ...
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2answers
76 views

Is a run-time adjustable boost converter possible?

I have a power supply that ranges from 12V-30V. I want to power a set of 4 (24V, 1A) solenoids in series. I also want to use a reduced hold current. So, I'm looking for an output of 96V for a time (~...
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2answers
222 views

Buck / step down voltage in limited space

I am designing a small PCB. The supply voltage is 12V, but I also need 5V with supply of maximum 250mA. The most obvious solution is to use voltage regulator - there are plenty of them and some like ...
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2answers
59 views

Clarifications needed about buck converter output ripple voltage derivation

I have a question regarding buck converter output ripple. In the below figure, could you please tell me how the area shown in the red circle has a time duration of Ts/2?
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1answer
94 views

Switching regulator vs converter

Is there any difference between switching regulators and converters? I have read about step-down voltage regulator and buck converters and they seem to be the same. So, can I use the term converter ...
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67 views

TPS63050 Switcher Power Good Signal

I've got a board where I'm using the TI TPS63050 switching regulator. I've recently discovered that if I put a bit more load on the output, I get some spurious event on the PG (power good) open-drain ...
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45 views

Unexpected current draw at idle load with MIC28517 Buck switching regulator?

I've designed and fabbed a PCB with a design for the MIC28517 IC and at 62.5V Vin I get a current draw of 50mA of the IC and Inductor which do get warm(3W dissipated on the inductor and IC) I've ...
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1answer
30 views

Design problem with current mode boost converter with the PAM2423 comp?

I'm trying to a boost conveter PAM2423 which workd at 520kHz for the first time(using a high quality breadboard from jameco for prototyping) following the manufacturer ref schematic: My Setup: I've ...
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2answers
36 views

How can the output current be programmed in Step-Down Regulators?

I use analog device's LTC3649 regulator as step down regulators. It is said that there is a programmable output current in the datasheet, but I have no idea how to do this. Anyone have an idea or ...
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3answers
219 views

Why am I seeing voltage spikes on the output of an LM2596?

I have been working on building a DC/DC converter for an ESP32 using an LM2596. With a few prototypes out in the wild I'm seeing them reboot randomly. Having the circuit back on my desk with a scope I'...
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1answer
41 views

Switching regulator startup voltage and sag

I have designed my first voltage regulator circuit using LMR33630ADDA. When supplied with input while not loaded, it produces a very good 5V. If I have a load of ~20mA attached when input is applied, ...
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1answer
82 views

Using linear and switching regulators in parallel for servos and microcontroller

I'm just wanting to confirm that this circuit would be safe/reliable to implement. I'm hoping to run two servos - one 6V one 7.4V - in parallel with an ESP32 dev board with built-in linear regulator, ...
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54 views

What is affected by switching noise - do I need to care about it?

EDIT: Load side is build up like this : ESP > Shift Register/Expander > NMOS > SSR DC > 3 x Pumps (uses V_in or external power supply via SSR AC) ESP > Shift Register/Expander > NMOS ...
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1answer
49 views

setting up LDO with variable output current (+diagram)

After reading on regulators, and asking few questions here and there, I think I should change my circuit to the following scheme : These images are from datasheet of the LDO regulators (both ...
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1answer
71 views

MP1584EN Regulator

i found this schematic in Datasheet . what is 'C6' value Here ? What is Mean of 'NS' ? how Can i get 5.5 volt in output .
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1answer
65 views

Input transient voltage of a regulator

I am using a regulator in a design. The regulator gives 5V output with 9V to 60V input. The datasheet says that the input transient voltage is 80V/second. Does this mean the regulator can handle an ...
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42 views

Low-Standby Battery Power Button Circuit

I return with yet another power switch circuit for an entirely new project! (Yeah I do a lot of robot projects lol) So basically I designed a circuit to turn on/off a battery-operated device from the ...
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2answers
127 views

Does the body diode of the high side n-channel FET in a buck converter turn on during switch node voltage spike time?

A typical synchronous buck: The normal switch node spike that people typically see when the high side FET turns on: In the past i have been fairly negligible on this part. When the switch node spike ...
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3answers
130 views

Can LC filter at the input of the switching regulator cause problem?

The system I designed uses switching power supply Microchip MCP16311 for operation. The problem is that during Run test, which i let the board communicate with other system via Modbus, the ...
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31 views

how to determine max peak of switching regulator in frequency domain (radiated emission)

I want to know how do I determine what should be the switching regulator peak in frequency domain(Radiated emission) , and where should I measure (Output or on inductor , capacitor). Lets do below ...
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84 views

LM2576 vs modern step-down switching regulators - EMC requirements and other differences

I'm looking for some cost reduction in my design and I want to replace TPS54302 with LM2576 or LM2575. In my case - switching regulator works as a pre-regulator with 12-24V input and ~6V output, ...
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1answer
628 views

How to use USB 5V output for 3.3V webcam module

I want to use an old webcam module from a notebook which needs 3.3V. Therefore I want to solder it to a USB cable and use it at an USB port on my computer. For now I use the 3.3V source from a ...
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22 views

LTC3106 solar harvester over-voltage at output during recharge

I'm using an LTC3106 in the configuration of the attached schematic: It works fine from battery and from Vin inputs, delivering the expected 3,3 V at Vout. Problems arise when, with Vin present, the ...
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3answers
584 views

Why is it required to put an external inductor and diode at the output of a step-down switching voltage regulator?

I'm using a LM2576 switching voltage regulator and I see that an inductor and a Schottky diode are required at the output. The schematics is below: I understand why the capacitors are there, but why ...
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66 views

How does this compensation network work?

By accident I stumbled upon this Linear Technology application note (LT1074/LT1076 Design Manual): https://www.analog.com/media/en/technical-documentation/application-notes/an44fa.pdf Just for fun I ...

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