by Mary Anne Tupta:
DC-DC converters are widely used components that convert DC power from one voltage to another, producing a regulated output voltage. These devices are used in many electronic products, including laptops, mobile phones, and instrumentation. Like any device, DC-DC converters need to be characterized by manufacturers and by engineers evaluating them for a design.
Given the increased pressure to develop products that consume less power, design engineers are looking for ways to increase power conversion efficiencies. Thus, numerous measurements are required to characterize the electrical parameters of DC-DC converters.
Simplify DC-DC Converter Characterization - [Link]
hpb @ instructable writes:
I was looking for a dual voltage power supply initially to power an old HDD with 12V and 5V. I wanted to build a home server based on the Raspberry Pi. I later realized that I had a newer hard-drive that needed only 5V. By then I had already designed and built this one. This power supply has a typical efficiency of 85%+ under real-world conditions and is based on TI’s TPS54383 DC-DC converter chip which operates at 300 KHz. A 600 KHz version is also available and is a drop-in replacement for TPS54383.
High efficiency Dual Voltage 3A power supply - [Link]
High-performance Easy-to-use Mini Power Modules for Makers. Innovative circuitry enables positive/negative supply in one module.
PNMini is a family of high performance, easy-to-use DC/DC Power Modules for DIY electronics.
PNMini can be used as positive supply or negative supply. If both positive and negative supply rail are needed, just connect two PNMini modules together. No hardware changes are required.
PNMini is available in a small PCB package that enhances thermal performance and allows for hand soldering or plugin use. It provides +3.3V/-3.3V, +5V/-5V, or +12V/-12V output directly to your circuits requiring no external components.
PNMini – Positive/Negative Power Supply Module for Makers - [Link]
This article explains the basic concepts of linear regulators and switching mode power supplies (SMPS). It is aimed at system engineers who may not be very familiar with power supply designs and selection. The basic operating principles of linear regulators and SMPS are explained and the advantages and disadvantages of each solution are discussed. The buck step-down converter is used as an example to further explain the design considerations of a switching regulator. by HENRY ZHANG
by Zhongming Ye:
Flyback converters are widely used in isolated DC/DC applications because of their relative simplicity and low cost compared to alternative isolated topologies. Even so, designing a traditional flyback is not easy—the transformer requires careful design, and loop compensation is complicated by the well known right-half plane (RHP) zero and the propagation delay of the opto-coupler.
Linear Technology’s no-opto flyback converters, such as the LT3573, LT3574, LT3575, LT3511, and LT3512, simplify the design of flyback converters by incorporating a primary-side sensing scheme and running the converter in boundary mode.
Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V - [Link]
This 5v dc power switching converter is designed using the LT3680 power switching regulator manufactured by Linear Technology. This 5v switching regulator require an input voltage between 6.3 and 36 volts and will provide a 5 volt fixed voltage at a maximum current of 3.5A. LT3680 use current mode topology for fast transient response and good loop stability. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application.
LT3680 – 5V Step-Down Switching Regulator - [Link]
This Dc power converter circuit is designed LTC3601 from Linear Technology and is capable to up to 1.5A output current at a 3.3V. The LTC3601 operating supply voltage range is from 4V to 15V making it suitable for a wide range of power supply applications. The operating frequency of the LTC3601 buck regulator is programmable from 800kHz to 4MHz with an external resistor enabling the use of small surface mount inductors. The LTC3601 buck regulator can operate in two modes: Burst Mode operation and forced continuous mode to allow the user to optimize output voltage ripple, noise, and light load efficiency for a given application.
LTC3601 – 3.3V 1.5A Step-Down Regulator - [Link]
Using LTM8031 integrated circuit, manufactured by linear technology, can be designed a very simple high efficiency dc dc converter circuit. This LMT8031 dc voltage converter circuit will provide a 5 volts output from a wide input voltage range between 7 and 36V dc. The switching frequency range of LTM8031 is from 200kHz to 2.4MHz which can be set by a single resistor. To finish the design of the LTM8031 are needed only the bulk input and output filter capacitors . Main features of this ic based dc converter project are: Complete Step-Down Switch Mode Power Supply , Wide Input Voltage Range: 3.6V to 36V , 1A Output Current , 0.8V to 10V Output Voltage , Switching Frequency from 200kHz to 2.4MHz , EN55022 Class B Compliant , Current Mode Control. Maximum output current of this circuit is around 1A.
LTM8031 – 5v 1A DC/DC μModule Regulator - [Link]
Using LT3980 manufactured by Linear Technology can be designed a very simple 5 volts dc converter circuit. The LT3980 has an adjustable frequency from 100kHz to 2.4MHz and accepts input voltages up to 58V . The transient voltage of the LT3980 is around 80 volts . The maximum output current which can be delivered by the LT3980 monolithic buck switching regulator is around 2 Amps . Main features of the LT3980 monolithic buck switching regulator are : wide input range from 3.6V to 58V , overvoltage lockout protects circuits through 80V transients , 2A Maximum Output Current , low ripple (<15mVP-P) Burst Mode, Adjustable switching frequency: 100kHz to 2.4MHz ,low shutdown current: IQ < 1μA, thermal protection, Soft-Start Capability.
LT3980 – 5V 2A DC-DC Step-Down Switching Regulator - [Link]
David @ daqq.eu pointed us to his latest power supply tear-down.
The HP 6010A is a monster of a power supply, capable of providing 1kW. There are three limits: 17A, 200V and 1kW – that means that you can source 200V, but only up to 5A. You can suck 17A, but only at up to 60V.
I got this one second hand, possibly third or eight hand. Some butchery has been done – some parts were replaced (the old ones probably blew).
All in all, the device is a big power supply, not meant for precision but rather for power. The power supply works well, though I’ve yet to test the 1kW – it’s not exactly easy to sink 1kW of heat
HP 6010A – 1kW power supply Teardown - [Link]