Solutions Search - Positive Linear Regulators (LDO)
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 ...
Common Questions About the LTC2668 Family of 16bit VOUT DACs
Apr 19th 2016
The LTC2668-16 packs 16, 16-bit high performance Digital to Analog converters (DACs) into a tiny, 6x6mm QFN package, with 8 and 4 channel versions in a 5x5 QFN, and 12-bit versions for lower resolution applications. A general purpose DAC such as this finds its way into a myriad of diverse applications, and tends to generate ...
AN159: Measuring 2nV/√Hz Noise and 120dB Supply Rejection on Linear Regulators - The Quest for Quiet
Apr 4th 2016
AN159: Introduction
A quiet, well regulated supply is important for optimum performance with a number of circuit applications. Voltage controlled oscillators (VCOs) and precision voltage controlled crystal oscillators (VCXOs) respond to small changes in their supply very quickly. Phase-locked loops (PLLs) require a stable supply ...
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 ...
Shutdown with the LT3080x Current Source Reference Linear Regulators
Jan 21st 2016
Current Source Reference Linear Regulators
In many low noise applications, a linear regulator is an ideal solution for the power conversion due to its very low output voltage noise and low electromagnetic noise generation (compared to a charge pump or a switching regulator). The LT308x linear regulator family is ideal for these ...
Increasing Output Current of the Ultralow Noise, Ultrahigh PSRR LT3042 200mA Linear Regulator
Aug 17th 2015
The LT0342 is a 200mA, 1.8V to 20V input, linear regulator that targets low noise RF and wireless circuits. It features an industry-leading 0.8µVRMS output noise (10Hz to 100kHz) and an impressive 79dB PSRR at 1MHz. Several customers have asked for ways to increase the current above 200mA while still maintaining low noise ...
Paralleling Linear Regulators Made Easy
May 21st 2015
Linear regulators provide a simple, low noise solution for dc-dc regulation. However, at higher Vin-Vout differentials the low efficiency and high power dissipation of linear regulators limits the ammount of output current that can realistically be delivered. Connecting multiple linear regulators in parallel spreads the ...
Loop Gain and its Effect on Analog Control Systems
Jan 26th 2015
Abstract
This article brings together the ideas of open loop gain, closed loop gain, gain and phase margin, minimum gain stability and shows how these parameters are interrelated in a feedback system. It examines loop gain in terms of a theoretical control system as well as practical electronic circuits, including linear regulators.
Introduction
Bob ...
Output Voltage Noise Measurements for Linear Regulators
Sep 20th 2014
Linear regulators provide a simple, non-switching DC/DC converter solution with low component count, small solution footprint and low output voltage noise. These attributes make them well-suited for applications that have power supply noise constraints, have limited board space and are averse to magnetics. Applications ...
Linear Regulators with Active Output Discharge Target Systems Needing Fast Power Down
Jul 21st 2014
Click here for a list of linear regulators with active output discharge
Image sensors are used extensively in many fields, including the medical field, where they are used by doctors and hospital staff for medical diagnostics. The medical instruments are often subjected to a harsh environment that includes constantly being ...
Control the Voltage of a Remote Load Over Any Length of Copper Wire
Jul 8th 2014
Introduction
A common problem in power distribution systems is loss of regulation due to the cable/wire voltage drop between the regulator and the load. Any increase in wire resistance, cable length or load current increases the voltage drop over the distribution wire, increasing the difference between actual voltage at the ...
Linear Regulator Frequently Asked Questions: What Is Current Limit Foldback?
Jul 11th 2013
Q: What is current limit foldback?
A: This is a current limiting technique to limit the peak power dissipation to prevent thermal destabilization or thermal runaway in the power transistor (which usually leads to the part destroying itself), to keep it in its SOA (safe operating area).
As an example, see the current foldback ...
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