|
Three-Channel White-LED Driver Uses Simple Step-Down DC/DC Converter
- 09/13/12 EDN Design Idea Drive multiple LEDs with current
mirrors from a single step-down converter. . . . [by Nora Jacalan Esteves, Technor Semiconductor LLC,
Pleasanton, CA ]
Tiny Charge Pump Provides
Highly Reliable Low Cost Solution to Negative Reference Voltage
- Application Note #348. . . [Maxim Integrated]
Touch Switch 240VAC
- This is another capacitance based touch on/touch off
switch, which can control power to a 200 watt 240vac load . . . [Hobby Circuit designed by Dave Johnson
P.E., 02/12/02]
Touch Switch Exciter
- If you have hundreds of touch switches that need an excitation signal, then this circuit is what you
need. Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . .
. [Hobby Circuit designed by David Johnson P.E., 02/11/02]
Trading Performance for Cost
in Portable Power Supplies - Application Note #269. .
. [Maxim Integrated]
Transformer Design Consideration for
off-line Flyback Converters Using Fairchild Power Switch FPStm/AN-4140
- Fairchild App Note. . .
Triggered spark gap
- This is purely a construction article. . . .
Triple Capacitive Voltage
Inverter with the Max871 - Application Note #1875. .
. [Maxim Integrated]
Tripler converts 5
to 15V - 08/17/00 EDN Design Idea By configuring a
charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V (Figure 1). A 15V rail is useful
for powering op amps, LCD-bias circuits and other low-current applications. The connections shown conf. . .
[by Ken Yang, Maxim Integrated Products, Sunnyvale, CA]
Tripler Converts 5 Volt to
15V - Application Note #297By configuring a
charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V (Figure 1). A 15V rail is useful
for powering op amps, LCD-bias circuits, and other low-current applications. The connections shown configure
the IC1 voltage doubler as a tripler. The no-load output. . . [Maxim Integrated]
Two Channel Gate Driver for
Large IGBT Modules - The BG2A is a fully isolated two
channel gate drive Circuit designed for use with dual IGBT modules. The BG2A utilizes Powerex VLA500-01 or
VLA502-01 hybrid gate drivers to provide efficient switching of modules rated up to 1400A. The hybrid gate
driver features a built-in high speed opto-coupler, short circuit protection and an isolated DC to DC
converter with 2500VRMS isolation. . . .
Two ICs Convert 4 20mA Signal
to 0 5V Output - App Note/ 823 / Aug-09. . . [Maxim
Integrated]
Two Watt Switching Power Supply
- from 6V to14V. . . [Bill Bowden's website]
UCC3809 Evaluation Module
- The UCC3809EVM evaluation module is an isolated 10-W, 3. 3-V
converter designed for telecom input voltages, nominally -48 Vdc, but ranging from -32 Vdc to -75 Vdc. The
UCC3809 economy primary-side controller is used as the pulse-width modulator (PWM) , combined with a TLV431
low-voltage adjustable-precision shunt regulator on the secondary side. . .
Ultra Low
Drop Linear Regulator - This is a circuit for a
MOSFET based linear voltage regulator that can regulate ultra low voltage drops as low as 60 mV at 1 ampere.
. . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
Ultra Low Power
Human Finger Detector - The circuit below seems
to work well and averages a current drain of only 10 microamps from a lithium cell. It uses a single CA4013
dual D flip/flop. One section is wired as a pulse generator. It applies 10us 10ma pulses to a LED inside a
slotted optical sensor at a rate of about 50Hz. The phototransistor in the second half of the sensor detects
the pulses and sends a pulse to the data input of the second flip/flop in the 4013 package. If there is
nothing between the LED and the phototransistor, the inverting output of the 4013 remains low. . . .
[Circuit Solution by David A. Johnson P.E., 05/01/06]
Ultra Pure 125kHz Sine Wave
Signal Source - For some RFID systems operating
at 125KHz, a very low distortion signal source reference is needed. The circuit shown on this page produces a
10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0. 01% . . . [Circuit by David A.
Johnson P.E., 02/11/02]
Ultra Simple Split DC Supply
- When you need a +/- supply, and only have a DC adapter . . . [Rod
Elliott (ESP)]
Universal
High Resistance Voltmeter - . . .
Universal Input 48W PFC Application
- The LT3798 is a constant voltage/constant current isolated
flyback controller that combines active power factor correction (PFC) with no opto-coupler required for
output voltage feedback into a single-stage converter. A LT3798 based design can achieve a power factor of
greater than 0. 97 by actively modulating the input current, . . . [Linear Technology App Note, Dec 5th
2011]
Use a 555 timer as a switch-mode power supply
- 11/14/02 EDN Design Idea Most switch-mode power supplies rely on a PWM
(pulse-width-modulated] output that is controlled via voltage feedback. A 555-timer IC can inexpensively
perform PWM. The circuit in Figure 1 shows how to turn a 555 PWM circuit into an . . . [by Aaron Lager,
Masterwork Electronics, Rohnert Park, CA]
Use A Three-Phase Rectifier and Voltage Reducer for Offline Single-Phase Supplies
- 04/06/12 EDN Design Idea Missing diodes create gaps to
allow voltage reduction. Some industrial applications require you to feed a low-power dc/dc converter from a
three-phase source and possibly to deal with line-to-line voltages of 200 or 400V rms. Further, the neutral
terminal of the ac source may be unavailable for connection, forcing you to use a line-to-line voltage link,
which means a higher input voltage. Voltage faults can happen in one or two phases, and some applications
require the power supply to keep working despite this problem. . . . [by JB Castro-Miguens, Cesinel, Madrid,
Spain; C Castro-Miguens, University of Vigo, Spain; M Pérez Suárez, University of Vigo, Spain; and A Abal
Pena, Tekplus, Vigo, Spain]
<<<< Previous
PAGE Next >>>> |
