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Off-Line Buck Regulator Cuts Costs, Lead-Time - 10/26/95 EDN Design Ideas: The low-cost, frequency-modulating buck regulator in Fig 1 uses an inexpensive CMOS
iCM7555 timer and a low-cost, low-power rail-to-rail op amp. Because of the low power of these parts, the circuit can achieve efficiencies of more than 90%. Although you can combine many controllers with a high-side switch to achieve the same function, this circuit is cheap. Also, you can quickly build it from easily available parts. Design by Peter McAnn, Trek Inc, Medina, NY Off-Line Power Supply Requires Few Part - 02/17/94 EDN Design Ideas: This simple non-isolated off-line power supply can provide up to150 mA5V and uses only a handful of components from110-230-Volt AC input voltage. Note that the low voltage output is directly connected to the mains; it cannot be used when the low voltage part can be touched Design by Sam Ochi, IXYS Corp, Santa Clara, CA
One 9 Volt Battery gives +18 +25 +33V - This circuit is based on MAX1044 is a charge pump converter __ Designed by R.G. Keen
One Cell Flashes White LED - 12/11/03 EDN Design Ideas: Many portable appliances and other products that must operate from a single cell are restricted to working at very low voltages. it is thus difficult to drive white LEDs that typically have a forward voltage of 3 to 5V. The ability Design by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK
One cell lights any LED - 07/05/01 EDN Design Ideas: The circuit in Figure 1 allows you to light any type of LED from a single cell whose voltage ranges from 1 to 1.5V. This range accommodates alkaline, carbon-zinc, NiCd, or NiMH
single cells. The circuit's principal application is i Design by Al Dutcher, Al Labs, West Deptford, NJ
One IC Biases LCD & GaAsFET Amplifier - 04/09/98 EDN Design Ideas: (File , contains several circuits, scroll to this one) Operating from a lithium-ion cell or a four-cell NiCd battery, the circuit in Figure 1 provide as 6V bias for LCDs and a separate, quiet negative bias for a GaAsFET power amplifier. This bias combination exists in cell phones Design by John Wettroth, Maxim Integrated Products, Apex, NC
One resistor improves V2 converter - 08/15/97 EDN Design Ideas: Step-down switching regulators commonly provide myriad digital-circuit voltages that range from traditional logic voltages of 5 and 3.3V to processor-core voltages of 1.8V and below. The main advantage of these regulators Design by Dimitry Goder, Switch Power Inc, San Jose, CA
One Transistor Provides Short-Circuit Protection - 10/16/03 EDN Design Ideas: in certain DC/DC-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit. A nonsynchronous boost converter provide as a direct path from the input to th Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA
Open-loop power supply Delivers as much as 1W - 01/18/01 EDN Design Ideas: For VCRs, TVs, and other equipment that requires a standby mode, you must supply power to a µP when other components are asleep to receive and interpret any wake-up signal from the remote control or from the broadcasting company. These types Design by Christophe Basso, On Semiconductor, Toulouse, Cedex, France
Optimized DC/DC Converter Loop Compensation Minimizes #of Large Output Capacitors - DN186 Design Notes__ Linear Technology/Analog Devices
Optimizing a DC/DC Converter’s Output Capacitors with the LTC1435A - DN198 Design Notes__ Linear Technology/Analog Devices
OTP µC controls Boomer Amplifier - 03/18/99 EDN Design Ideas: NOTE: Page includes several designs. Scroll to find this one. Figure 1 shows a circuit that uses a one-time-programmable (OTP) µC in an unusual way. A COP8SGR7 µC uses digital signals to "bit-bang" an LM4835 (dubbed "Boomer" by National) amplifier. Although the amplifier is designed for potentiometer control, you can modify it to make it a fully digitally controlled part. Figure 2 shows the flow chart for the control process. Design by Wallace Ly, National Semiconductor Corp, Santa Clara, CA
Output Adjustable Flyback Converter - A high voltage step-up DC power supply using adjustable flyback conversion. __ Designed by Simon Oh
Overall Noise Figure of Two Stage Amplifier - Application Note__ MiniCircuits.com
Over-Temperature Micro-Power Alarm - The circuit is powered for years by a single 3 volt lithium battery. it sounds an alarm when the temperature exceeds a certain point. With some minor changes the circuit could also be configured for an under temperature (freeze) alarm. The circuit uses a . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000
Pass Transistor Lowers Dropout Voltage - 02/18/99 EDN Design Ideas: NOTE: File contains several circuits, please scroll to this this one. With linear regulators, you measure dropout voltage, ViN–VOUT, at the minimum input voltage for which the IC sustains regulation. Low dropout means longer battery life, because the load circuit continues to operate while the battery discharges to a lower terminal voltage Design by Matt Schindler, Maxim Integrated Products, Sunnyvale, CA
PFM Control Improves Dual-Output Converter - 09/28/06 EDN Design Ideas: Upgrade an RGB video system without adding cables Design by Werner Schwiering, Joystick Scoring Ltd, Whitby, ON, Canada
Photo Flash Charger Minimizes Parts Count - 10/22/98 EDN Design Ideas: Photo-flash and strobe devices operate by discharging a high-voltage capacitor into a bulb. Charging the capacitor from a battery or other low-voltage source requires a step-up DC/DC converter to boost the voltage, typically to 300V. One way to generate the high voltage Design by Steven Chenetz
Piezoelectric Energy Harvester & 1.2V Secondary Rail - The LTC3388-1/LTC3388-3 are high efficiency step-down DC/DC converters with internal high side and synchronous power switches that draw only 720nA typical DC supply current at no load while maintaining output voltage regulation. The EN pin can be used to activate the LTC3388-1/LTC3388-3. For instance, in this circuit the __ Linear Technology/Analog Devices App Note, Jul 23, 2010
Peak to Peak 300v Signal Generator - This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
PolyPhase™ DC/DC Converter Delivers High Current - DN234 Design Notes__ Linear Technology/Analog Devices
Positive regulator makes dual negative-output converter - 06/26/03 EDN Design Ideas: Some systems, such as optical networks, require than one negative voltage. A common procedure is to boost the main negative supply of -5V to -10V and then reduce it with a linear regulator to -9V. The -5V itself comes from a positiv Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA
Positive regulator makes negative DC/DC converter - 12/26/02 EDN Design Ideas: Power-supply designers can choose from a plethora of available positive buck regulators that can also serve as negative boost DC/DC converters. Some buck regulators have a negative-feedback reference voltage expressly for this purpose, but ICs that have positive-reference feedback voltages far outnumber these negative-feedback regulators Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA
Power Supply - Circuit provides +5VDC regulated, +10VDC unregulated and 7.5VAC. __ Designed by Wichit Sirichote
Power Supply (psu 1) - One of the most useful circuits for the home constructor is the Power Supply Unit. A transformer with tapped secondaries can give a range of output voltages for testing and operating home-made equipment. __ Designed by Harry Lythall-SM0VPO
Power Supply Accepts Wide Input-Voltage Range - 02/17/11 EDN Design Ideas: A SEPiC-based power supply runs from 1.5V to 20V. The switching power supply in Figure 1 produces 3.3 V dc from an input voltage of 2.5 to 20V dc with high efficiency. The circuit operates at an input voltage as low as 1.5V once it starts from a minimum of 2.5V dc, allowing the switcher to fully discharge a pair of alkaline cell batteries nearing end of life. The power supply can also run efficiently off higher input voltages, such as 12V automotive power. The heart of the circuit is a SEPiC (single-ended-primary-inductance-converter) -based switching power supply, which provide as an output voltage greater than or less than the input voltage (Reference 1). Design by Jim Windgassen, Northrop Grumman Undersea Systems, Annapolis, MD
Power Supply Converted from a PC link - This ATX PS board has leads for +5 (RED) , -5 (WHiTE) , +12 (YELLOW) , -12 (BLUE) volts, Ground (BLACK) and switch (GREEN). Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard pinout and color codes. The fan has also been unplugged for better viewing. Since this PS was converted for use in the logic and robotics labs, the selected voltages __ Designed by Andy Batts
Power Supply Fits Into Small Spaces - 11/13/03 EDN Design Ideas: The demand for negative-voltage power supplies is increasing with the popularity of applications for portable devices. it can be expensive and relatively complicated to generate a negative supply from a positive input source, especially when the design requires both positive and negative outputs Design by Raymond Zheng, Linear Technology, Milpitas, CA
Power Supply Provides +5VDC Regulated, +10VDC Unregulated & 7.5VAC - Build a simple DC supply having three output terminals: regulated +5VDC, unregulated +10VDC and 7.5VAC. The supply is suitable for microcontroller experimenting. __ Designed by Wichit Sirichote
Power Supply Runs off Battery or Wall Adapter - 06/18/98 EDN Design Ideas: Most portable products need to operate from both a battery and an external wall adapter. Although conceptually simple, implementing a robust and bulletproof design that properly switches between these two power sources can be challenging. The circuitFile contains several circuits, scroll to find this one Design by David Bell, Linear Technology Corp, Milpitas, CA
Power Supply Transient Protection for MNA & VNA Amplifiers - AN-60-027 Application Note__ MiniCircuits.com |
