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Posts Tagged ‘SMPS’

App note: How to eliminate over stress of MOSFET during start-up of flyback converter

Sunday, November 11th, 2018

App note from Richtek about their embedded soft-start function to eliminate MOSFET stress. Link here Switching Power Supply, compared to Linear Power Supply, is widely used due to its advantages, such as small size, light weight, high efficiency, etc. Flyback Converter, one of the switching power supply topologies, is most...

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App note: The four benefits brought by using NCP12600

Sunday, February 18th, 2018

App note discussing extended features of NCP12600, NCP12600 is a multi-mode controller for offline power supplies by ON Semiconductor. Link here (PDF) Beside the novel multi−mode structure it embarks, the NCP12600 packs a lot of features such as an efficient short−circuit protection architecture, a start−up sequence with a slow switching...

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App note: TEA1938T GreenChip SMPS control IC

Sunday, September 24th, 2017

TEA1938T SMPS control IC application note from NXP Semiconductors. Link here (PDF) The TEA1938T is a high-featured low-cost DCM and QR mode flyback converter controller. It provides high efficiency at all power levels and very low no-load power consumption at nominal output voltage in burst mode operation. To minimize ripple,...

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App note: Audible noise reduction techniques for FPS (Fairchild Power Switch) Applications

Sunday, December 18th, 2016

Reducing audible noise in switch mode power supplies app note from ON Semiconductors. Link here (PDF) In general, switched mode power supplies do not generate audible noise when they operate at constant ultrasonic frequencies (>20kHz). However, some switched mode power supplies can produce audible noise at certain load conditions. Most...

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Analysis, operation, and modification of a switchmode power supply (SMPS) for variable output voltage

Wednesday, May 18th, 2016

Lindsay Wilson did a teardown/modification of a Chinese SMPS to allow an adjustable output voltage: I'm currently working on a product which uses a size 2430 "hobby" brushless motor and 25A electronic speed controller (ESC). In its "intended" use, the controller runs from two lithium-ion batteries with a total voltage...

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Posted in Teardowns | 1 Comment »

App note: Output capacitive load considerations

Sunday, April 5th, 2015

App note(PDF) from Murata on output capacitors loading when in a switch mode power supply There are numerous factors to consider when adding external capacitors to switched-mode power supplies (SMPS). This article will discuss noise, startup, ESR, stability, pre-bias applications, Sense inputs, On/Off (remote enable) controls and other topics. Many...

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App note: Switching power supply design with the PIC16F785

Sunday, June 29th, 2014

An SMPS application using PIC16F785 from Microchip, app note here (PDF). In this application note, we will examine a typical buck topology intelligent SMPS design using the PIC16F785. The design presented here shows an alternative single-chip approach to adding intelligence to SMPS designs. The basic design is really unchanged. There...

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SMPS with battery backup and NiMH charger using the LM2595

Tuesday, April 2nd, 2013

Giorgos from PCBheaven designed an SMPS buck regulator with 2xAA NiMh battery trickle charger and power failure output: Some time ago I presented a small circuit with the MCP1640, the High Efficiency Battery Boost Regulator using the MCP1640. My original intention was to combine it with this one and make a...

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App note: Reducing system noise and voltage overshoot in buck topology switch mode regulators

Saturday, October 6th, 2012

Here is an article describing how to reduce noise and voltage overshoot in buck topology DC/DC converters. Slowing down the turn on time of the high side switch in conjunction with replacing a diode with a low side switch should increase efficiency and lower the power dissipation. Adding snubers (RC...

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App note: Diode turn-on time induced failures in switching regulators

Saturday, October 6th, 2012

[embed]http://www.youtube.com/watch?v=7Ld8ms3h6w8[/embed] Last week we wrote about fast diodes for switching regulators, this week Niklas points us to a video on the topic narrated by Jim Williams, the late analog electronics guru. Via the comments.

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Posted in app notes | 1 Comment »

App note: High power LED driver with PIC12F675

Saturday, September 15th, 2012

A current controlled buck converter for driving high-power LEDs. The PIC12F675 microcontroller has an integrated comparator, which in combination with a low pass filter provides a control circuit for the SMPS. The circuit is based on a buck topology switching power supply using the on-chip comparator peripheral within the PIC12F675...

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Posted in Uncategorized | 1 Comment »

Nixies power supply up and running

Thursday, September 6th, 2012

Didn't design our own. Used great open source SMPS from desmith.net. 180v from 12 volts out of the atx break board in handsome new case. Design uses max1771 from maxim. Sorry - posted from WordPress Android app. Fixed the picture.

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Offline high voltage AC power supply

Tuesday, September 4th, 2012

Dilshan designed an offline high voltage AC power supply primarily for SMPS testing. It outputs a square wave, so hooking it up to a mains-transformer based linear supplies is not a good idea, as the transformer will overheat. It's open source hardware, so the schematics and design files are available....

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App note: Minimizing switching regulator residue in linear regulator outputs

Sunday, August 12th, 2012

Here is an app note from Linear Technology describing how to minimize switching regulator noise in linear regulator outputs. Linear regulators are commonly employed to post-regulate switching regulator outputs. Benefi ts include improved stability, accuracy, transient response and lowered output impedance. Ideally, these performance gains would be accompanied by markedly...

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Posted in app notes | 3 Comments »

App note: Switching regulator circuit collection

Sunday, July 29th, 2012

A Switch Mode Power Supply circuit collection from Linear Technology. It covers 12 basic SMPS circuit categories: Battery, Boost, Buck, Buck-Boost, Flyback, Forward, High Voltage,  Multioutput, Off Line, Preregulator, Switched Capacitor and Telecom.

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Posted in app notes | 3 Comments »

App note: Switching regulators for poets

Sunday, May 27th, 2012

The basics of SMPS design, written by the late analog guru Jim Williams: A problem is that while everyone agrees that working switching regulators are a good thing, everyone also agrees that they are difficult to get working. Switching regulators, with their high efficiency and small size, are increasingly desirable...

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Posted in app notes | 1 Comment »

Super Boost 3.6A USB charger based on LM2700

Friday, April 27th, 2012

Scrawny 500mA USB charger insufficient for your hunger for power? Try this 3.6 amp USB charger based on the LM2700 boost switch-mode IC. This design is inspired by the Minty Boost but it fixes some of the issues that I had with it. The Minty Boost is limited to 600mA...

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Posted in open source, project logs | 18 Comments »

Bus Pirate PIC programmer update

Thursday, December 10th, 2009

PIC 12/16/18/ds30 programming support for the Bus Pirate is progressing. Sean Nelson, a regular contributor to the Bus Pirate project, submitted a patch that adds serial port support to usbpicprog. The Linux patch compiles, but the Windows port still has some bugs. The picture shows our prototype 13volt power supply...

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Posted in Bus Pirate, programmers | 4 Comments »

Bus Pirate high voltage supply with only 6 parts

Friday, December 4th, 2009

We used the Bus Pirate and 6 common components to multiply 5volts to over 120volts with a boost converter, a type of switched-mode power supply. Similar circuits are commonly used to power 180volt nixie tubes from low voltage power supplies. This circuit is a simple way to build your first...

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Posted in Bus Pirate, Development | 1 Comment »

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