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292 results found, displaying items 161 - 180
Handy Circuit Options Boost Output Of Capacitive Supplies
Capacitive supplies are very attractive for applications that don't require isolation from the mains supply. Simple, inexpensive, lightweight, and reliable, they run cool and don't generate interference. However, they suffer from a significant...
Bridge-Power Supplies Pack 22 2700-F Ultracaps
Bridge-power units for telcos, data centers, and hospitals supply power for the brief interval between failure of the mains supply and the time that full backup power is available from fuel cells or generators. Traditionally, these have been...
Module Enables Energy-Efficient Switching Power Supplies
The LNK302 from Power Integra- tions is an alternative to capacitive droppers and linear transformers in home appliance and industrial control applications. Like other members of the LinkSwitch TN family, the LNK302 lets designers create...
Converters Reach 1000-W/in.3 Densities And 95% Efficiency
The NAT and NAS series of 12- and 20-A converters from NetPower Technologies achieve power densities up to 1000 W/in.3 with up to 95% efficiency. The NAT (in a single-inline package form factor) and NAS (in a surface-mount form factor) are available...
Step-Up Converters Protect Displays From Runaway Output
LCD and organic-LED displays for handheld portable equipment sometimes have problems with runaway outputs from high-voltage boost converters damaging displays.
Just For You
Welcome to the first of many "Analog and Power Ideas for Design." The feature will return next month. If the reader response is positive, the plan is to publish this section 13 times in 2005. A&P IFD is the launch of something new and...
Resistive Programming Allows Choice Of Downconverted Voltages
Astec Power's 75-W APC18 surface-mount point-of-load (POL) dc-dc converters...
Simple Circuit Drives PCI Express With PCI Hot-Plug Power IC
Conventional PCI and PCI-X computer slots have four supply voltages available: +12, +5, +3.3, and 12 V. PCI and PCI-X cards rely on +5 V and +3.3 V for most of the power and are limited to 500 mA of load current on the +12-V supply. This...
Emergency Light Turns White LEDs On When Power Goes Out
Power outages often occur unexpectedly, leaving you in total darkness. Whether in a hospital, a theater, or your home, such occasions call for an emergency lighting system that turns on automatically. The preferred emergency light source is...
Circuit Measures Microvolts In The Presence Of Volts
Sometimes, it's necessary to make microvolt measurements in the presence of volts. For example, the need arose to measure the thermoelectric potentials in an RTD circuit in which the 10 V applied to self-heat the RTD made measuring such tiny...
Power-Saving Pedometer Also Measures Speed
A pedometer is a device that counts the number of steps taken by a person and calculates the distance traveled by multiplying the number of steps by the length of the step. Here's a design solution for building a pedometer using the AVR MCU. The...
Fast-Charge Controller Handles 22-Cell NiCD/NiMH Battery
Because 22-cell nickel-cadmium/nickel-metal-hydride (NiCd/NiMH) batteries are ubiquitous, the need for a compatible battery charger that is inexpensive and simple to use and takes up little space is also common. You can implement such a charger by...
Digital Potentiometers Convert Voltage To Resistance
Industrial controls and variable-bias circuits sometimes require the services of voltage-to-resistance converters. But they can be difficult to implement. The simple approach shown in the figure builds such a...
Simple Circuit Generates +3.3 V At 1 A From –5 V
Figure 1 depicts a circuit that uses pulse-frequency modulation (PFM) to generate +3.3 V from a −5-V power supply without the need for a transformer. It's ideal for applications that have a stable...
Power Supply's Output Tracks Negative Input By One-Half
In some fiber-optic communication applications, the transimpedance amplifier needs a negative bias voltage that tracks the negative input rail by one-half for the data signal's common-mode input range. The circuit in ...
Triple-Output DC-DC Converter Uses Ceramic Capacitors
Even the smallest modern electronics systems now require more than one power-supply voltage. The challenge is producing the required voltages in as little board space as possible. Designers can produce three output voltages using a single controller...
Simple Buck-Boost Converter Shines In USB Applications
In USB applications, a constant 5 V is often required. But according to the USB standard, the input voltage can vary from 4.5 to 5.25 V. So converters must be used to stabilize the voltage. However, widely available buck (step-down) or boost (step-up)...
Semi-Precision Current Limiter Handles High-Power Loads
Implementing a current limit with a ground-referred load often requires a power transistor, a high-side current-sense resistor, and some form of level shifting to get the current-sense signal referred to a convenient potential, usually ground. The...
Novel Series-Boost Circuit Uses Flying Inductor
The power supply that's described here boosts the voltage from a 1.5-V flashlight cell to 3.5 V across an LED, while the LED and flashlight cell are in series with the power supply. What spawned this circuit was the need to make an LED retrofit kit...
Isolated DC-DC Converter Sports Dual Outputs
Presented here is an isolated 6-W dc-dc converter optimized to provide low-cost and efficient isolated power across a 2500-V ac potential barrier. The converter, which incorporates inexpensive, readily available components, can provide either two...
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