Solutions Search - Extended Temperature (H & MP) Switching Regulators
High Voltage, High Efficiency Positive to Negative Converter
Mar 8th 2017
Design Note 561: Introduction
Positive to negative conversion (inverting output) is widely used in LCD devices, OLED displays, audio amplifiers, industrial machinery, semiconductor manufacturing process control equipment, measurement tools, testing systems, LED drivers and battery chargers. Many of these applications require ...
Hybrid Wide Dimming Ratio Linear LED Current Controller Using LT8614 & LT3083/LT6015
Oct 17th 2016
Many applications for LED illumination require wide dimming ratios. This can be accomplished simply via an adjustable current source as show below. The current source can be varied by a number of different means, and a large LED current range can be achieved. The primary problem with this technique is that the power dissipation ...
LT3759 Wide Vin, 48V @ >100mA Output Boost Converter that Works Down to 1.6V
Oct 3rd 2016
The LT®3759 is a wide input range, current mode, DC/DC controller which is capable of regulating either positive or negative output voltages from a single feedback pin. It can be configured as a boost, SEPIC or inverting converter. An internal LDO regulator draws power from VIN or DRIVE to provide up to a 4.75V supply for ...
How NOT to Damage Your Switching Regulator Demo Board
Sep 2nd 2016
Introduction:
A great way to develop a design is to start with an existing demo board and modify it. While this simplifies the process, there are a few pitfalls to be aware of so that you do not have to spend time tracking down and replacing damaged components. Below are four common ways to damage your circuit.
1) Improper ...
95% Efficient at 2MHz 42V Sync Buck
Jun 24th 2016
Linear Technology’s family of high voltage synchronous step-down DC/DC switching regulators offer up to 95% efficiency. Switching at 2MHz, these low EMI parts utilize the Silent Switcher technology. Other features include spread spectrum frequency modulation, ultra-low quiescent current and are available with single, dual, ...
No-Opto Isolated Flyback Converters
Jun 10th 2016
The no-opto isolated flyback parts from Linear need no opto-coupler or LT1431 shunt regulator for regulation. They sense the isolated output voltage directly from the primary-side waveform. This simplifies the design, allows for a smaller solution size and only requires one component crossing the isolation barrier. The load, ...
A New Era in Space Products - Radiation Tolerant
Mar 23rd 2016
Recent developments have made doing business in space ever more achievable to a broadening base of companies. A market previously consisting solely of major defense contractors and national governments has been disrupted by a growing list of commercial companies determined to deploy an enterprise beyond the confines of our ...
Differences Between the Ćuk Converter and the Inverting Charge Pump Converter
Mar 7th 2016
The Ćuk converter (also referred to as the two inductor inverting converter), the inverting charge pump and the single inductor inverting converter (also referred to as the inverting buck-boost) all provide a negative output voltage from a positive input voltage. However, engineers often unknowingly refer to these topologies ...
Powering Altera Arria 10 FPGA and Arria 10 SoC: Tested and Verified Power Management Solutions
Feb 19th 2016
Design Note DN549: Introduction
FPGA development kits allow system developers to evaluate an FPGA without having to design a complete system. Figures 1 and 2 show Altera’s new 20nm Arria 10 FPGAs and Arria 10 SoCs (System-on-Chip) development boards. These boards are tested and verified by Altera, exemplifying best design ...
VID Controller with Phase Extender Provides 120A Power Supply for Latest Generation of FPGAs, ASICs and Processors
Jan 12th 2016
DN547: Introduction
The current drawn by FPGAs, ASICs and processors for high performance servers, network and computing systems continues to rise, and load currents of 100A or greater are becoming common. Meanwhile, the chip's operating voltages are dropping to 0.9V and below with tighter voltage regulation requirements. For ...
Spread Spectrum Frequency Modulation Reduces EMI
Nov 4th 2015
Electromagnetic Radiation (EMR), Electromagnetic Interference (EMI) and Electromagnetic Compliance (EMC) are terms that pertain to energy from electrically charged particles and the associated magnetic fields that can potentially interfere with circuit performance and signal transmissions. With the proliferation of wireless ...
Positive to Negative Converter with Variable Output Using LTC3630 and LT6015/LT6016
Sep 1st 2015
There was a window of time in the 1950s and early ’60s when negative voltage rails were commonplace, when germanium PNP transistors were prevalent—like those used in an old “transistor radio”, now worth a fortune on Ebay. Nowadays, NPN transistors are more prevalent, since they basically work ...
Data Backup Solution for 1mm, Low Profile Industrial Applications
Aug 25th 2015
Introduction
Data backup and retention during a power interruption is required in a wide variety of industrial and automotive applications, where emergency backup power supplies (such as a UPS) may be unfeasible. For example, a vehicle may need to transmit geographical coordinates and the vehicle ID during an abrupt battery ...
Robust 140V VIN, 400mA Step-Down Regulator for Industrial, Telecom and Automotive Environments
Aug 20th 2015
Design Note 543: Introduction
The LTC®7138 is a 400mA step-down regulator that can operate over an input voltage range of 4V to 140V, ideal for industrial, telecom, automotive and other applications subject to harsh line transients. Due to the regulator’s hysteretic architecture, no external compensation is required. ...
LTC3890 & LTC4000 60V Input DC/DC Power Supply with Battery Backup
Feb 27th 2015
Introduction
Circuitry presented in this article can be very useful for designing compact power supplies and extremely beneficial for system functioning in conditions of input power interruptions. The presented solution can be embedded into uninterruptible power systems or small standalone modules. It can be successfully employed ...
LT3753 9V-15V Input to 54V/3A Isolated Forward Converter
Feb 26th 2015
The LT®3753 is a primary side, current-mode PWM controller optimized for an active clamp forward converter topology. It features a programmable volt-second clamp that provides a duty cycle guardrail to limit primary switch reset voltage and prevent transformer saturation during load transients. The LT3753 also features ...
LT3752/LT8311 48Vin, 24Vout Active Clamp Forward Converter with High Light Load Efficiency
Feb 11th 2015
The LT3752 includes a number of programmable features that make it suitable for this application. For instance, programmable delays between various gate signals is used to prevent cross-conduction and to optimize efficiency, and programmable turn-on current spike blanking (adaptive leading edge blanking plus programmable extended ...
LT3798/LT8309 5V, 2A Energy Star Compliant Isolated Converter
Feb 10th 2015
The focus of this circuirt was to take a design based on the LT®3798 and make it Energy Star Compliant; reduce no load, standby power to less than 300mW. That was achieved by adding the components highlighted in the dotted line box in the schematic inside the primary side. This circuit is simply a switch that removes ...
LT8310/LT1431 81 Watt Isolated Nonsynchronous Forward Converter with Opto Feedback
Jan 30th 2015
The LT8310 is a constant-frequency resonant reset forward converter controller with a low side N-channel MOSFET gate driver. The LT8310 has a wide input voltage range from 6V to 100V. Its switching frequency can be programed from 100kHz to 500kHz to optimize efficiency, performance or external component size. The LT8310's protection ...
LT3790 240W High Efficiency Parallel Buck-Boost Regulator
Jan 5th 2015
The LT3790 is a 4-switch synchronous buck-boost DC/DC converter that regulates both constant voltage and constant current at up to 98.5% efficiency using only a single inductor. It can deliver hundreds of watts and features a 60V input and output rating, making it an ideal DC/DC voltage regulator and battery charger ...
High Efficiency 100mA Synchronous Buck Converter with Wide Input Range from 4V to 150V
Sep 17th 2014
Introduction
The wide 4V to 150V input range of the LTC®3639 stepdown DC/DC converter allows automotive, avionics and distributed power systems to:
Cover extensive transient requirements
Enable multiple wide-ranging input power sources, such as a high voltage DC bus with a low voltage battery backup
Create a ...
LTspice: Simple Steps for Simulating Transformers
Jul 1st 2014
Here is the simple approach to simulate a transformer in LTspice IV:
Draft an inductor for each transformer winding
Couple them using a single mutual inductance (K) statement via a SPICE directive:
K1 L1 L2 L3 1
The last entry in the K statement is the coupling coefficient, which can vary between 0 and 1, where 1 represents ...
Miniature Isolated Solution Using LT8301 and Coupled Inductor
Jun 19th 2014
Customers that require miniature solutions with only functional isolation often choose isolated modules. These solutions have very bulky form factors, and typically do not provide high power efficiency or a low no-load input current. In addition, the output voltages of these modules are usually unregulated, having large VOUT ...
LTM8050 TechClips - 58V, 2A Step-Down μModule Regulator
Apr 30th 2014
Inverting (Negative) Outputs
With a relatively wide input voltage and output voltage range, the LTM8050 is well suited for Inverting applications when a negative output voltage is desired. Watch the LTM8050 deliver a -12V output at 1.5A from a 24V Input with 83% efficiency and just a 54°C temperature rise over ambient.
Highly ...
Monolithic No-Opto Isolated Flyback Converter Provides Versatile Solution
Feb 19th 2014
Introduction
Traditionally, isolated power supplies use an optocoupler in the feedback loop to transfer regulation information across the isolation barrier. Unfortunately, an opto-coupler’s gain characteristic varies widely over temperature and lifetime, increasing the difficulty of power supply loop compensation.
Linear ...
Inverting DC/DC Controller Converts a Positive Input to a Negative Output with a Single Inductor
Dec 30th 2013
There are several ways to produce a negative voltage from a positive voltage source, including using a transformer or two inductors and/or multiple switches. However, none are as easy as using the LTC®3863, which is elegant in its simplicity, has superior efficiency at light loads and reduces parts count compared to alternative ...
Meet Green Standards in 24VAC and 12VAC Lighting Systems: Replace Halogen Bulbs with LEDs Driven by High Power Factor, High Efficiency Converter
Oct 17th 2013
LEDs are increasingly used in 24VAC and 12VAC lighting systems as a robust, energy efficient and high performance alternative to halogen lamps. Power converters that drive the LEDs should have a high power factor (above 90% in order to meet generally accepted green standards), should be efficient, use a minimal number of components ...
65V, 500mA Step-Down Converter Fits Easily into Automotive and Industrial Applications
Mar 1st 2013
Introduction
The trend in automobiles and industrial systems is to replace mechanical functions with electronics, thus multiplying the number of microcontrollers, signal processors, sensors and other electronic devices throughout. The issue is that 24V truck electrical systems and industrial equipment use relatively high voltages ...
Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V
Dec 1st 2012
Introduction
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 ...
Wide Input Voltage Range Boost/Inverting/SEPIC Controller Works Down to an Input Voltage of 1.6V
Mar 1st 2012
Introduction
Many of today’s electronic devices require an inverting or noninverting converter or sometimes both. They also need to operate from a variety of power sources including USB, wall adapters, alkaline and lithium batteries. To produce various polarity outputs from variable input voltages, power supply designers ...
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