Optimizing Efficiency in White LED Backlight Applications  -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs. LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors. LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost. . . .  [Texas Instruments App Notes, 21-Mar-07]

Parallel White LED Driver  -  Application Note LM3595 August 2003. . .  [National Semiconductor]

PC-Driven LED Display  -  Here is a circuit to generate sequentially running light effects using a simple program written in C. The output of the program is taken from the LPT port of a PC and then fed to the interfacing circuit for the LED display. The outputs of the interfacing circuit are decoded, inverted, and then connected to LEDs through optocouplers. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

P-channel power-MOSFET driver uses unity-gain op Amp  -  01/21/10    EDN Design Idea   Drive a power MOSFET to 100V dc with this signal-conditioning circuit. . .  [by Suded Emmanuel, Emmanuel's Controls, Auckland, NZ]

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 Johnson P.E.,  06/03/00]

Photovoltaic switch disables unused LEDs  -  03/18/04  EDN Design Idea   In many applications, it's desirable to disable LEDs used for system verification. Many options are available for the disabling function, including manual SPST (single-pole single-throw] switches, enhancement- and depletion-mode MOS. . .  [by Lance McBride, Monterey Bay Aquarium Research Institute, Moss Landing, CA]

PIC LCD & Keypad Driver  -  . . .  [MicrochipC by Mike Pearce]

PIC microprocessor drives 20-LED dot-or bar-graph display  -  09/01/06  EDN Design Idea   Indicator circuit features low cost and minimal component count. . .  [by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria]

PIC18xxx8 can Driver with Prioritized Transmit Buffer  -  Application Note Published 9-Sep-02. . .  [Microchip]

Piezoelectric Driver Finds Buzzer’s Resonant Frequency  -  08/07/08  EDN Design Idea by driving a piezoelectric buzzer near its resonant frequency and counting the residual oscillations, a microcontroller can find the buzzer's resonant frequency. . .  [by Mehmet Efe Ozbek, PhD, Atilim University, Incek, Ankara, Turkey]

Pin Diode Drivers   -  Application Note 02Mar1999. . .  [National Semiconductor]

Plus And Minus DC Power Supply  -  This is a classic example of a regulated DC power supply that produces both a positive 15v and a negative 15v from a 20vac wall adapter . . . [Hobby Circuit designed by Dave Johnson P.E.,  10/16/05]

Pot Controlled Variable LED Intensity Circuit  -  The circuit below uses power from four rechargeable AA NiMH cells to drive 3 white LEDs. A potentiometer varies the duty cycle of a pulse width modulator circuit to vary the intensity of the LEDs from 0% to 100%. The beauty of the circuit is that when the . . . [Circuit by David A. Johnson P.E.,  09/27/09]

Power An LED Driver Using Off-The-Shelf Components  -  01/20/11  EDN Design Idea   Drive LEDs with a 555 timer and two transistors. . .  [by TA Babu, Chennai, India

Power MOSFET Gate Driver Circuits using High Current Super-B Transistors: 6a Pulse Rated SOT23 Transistors for High Frequency MOSFET Interfacing  -  Zetex Semiconductors Applications Note:   A description of the MOSFET converter circuits' requirement for a high current buffer stage, a suggested range of Zetex high current capable, fast switching transistors, and circuit examples.  . . .   

Power Supply-24 Volts AC to 24 Volts DC  -  The idea for the circuit below came from a company needing to power several 24v DC LED assemblies from an existing 24vac supply. They did not need a rock solid and regulated 24 volts but a voltage which hovered around that voltage. Running the AC through . . . [Circuit by David A. Johnson P.E.,  02/20/11]

Powerlabs Flyback Driver  -  . . .   

Power-supply IC drives multiple LEDs  -  09/02/04  EDN Design Idea   Bright LEDs are becoming prominent sources of light. They often have better efficiency and reliability than do conventional light sources. Although LEDs can operate from an energy source as simple as a battery and a resistor,. . .  [by John Lo Giudice and Vee Shing Wong, STMicroelectronics, Schaumburg, IL]

Press and Hold Latching Circuit  -  A Discover Circuits visitor needed a latch circuit which could operate using a power supply voltage ranging from 3v to 24v. He wanted to use a tiny pushbutton switch to turn on and off power to a load. However, he wanted a 2 second delay between the switch activation and the state change of the output . . . [Hobby Circuit designed by David Johnson P.E.,  06/30/13]

Processor's PWM output controls LCD/LED driver  -  05/27/04  EDN Design Idea   The PWM (pulse-width-modulation] output available from many microprocessors is based on an internal 8- or 16-bit counter and features a programmable duty cycle. It is suitable for adjusting the output of an LCD driver (Figure 1) , a n. . .  [by Joe Neubauer, Maxim Integrated Products, Sunnyvale, CA]

Programming Fun Lights With TI's TCA6507  -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs. LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors. LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost. . . .  [Texas Instruments App Notes, 30-Nov-07]

Provide Effective LCD Drive  -  09/28/00 EDN Design Idea   LCDs find wide use in portable instruments, thanks to their attractive display and low power consumption. The circuit in Figure 1 is an effective driver for LCDs. The circuit comprises two main sections—the ICM7211 drivers (IC2 . . .  [by Luo Ben Cheng, Chinese Academy of Science, Beijing, China ]

Provide High-Side Current-Sensing for White-LED Drivers  -  02/19/04  EDN Design Idea   White LEDs find wide use in backlighting color-LCD screens in most portable devices, such as cellular phones, PDAs, and MP3 players. Multiple LEDs often connect in series to ensure that the same current flows through every LED. To . . .  [by Dimitry Goder, Sipex Corp, San Jose, CA]

Provides Effective LCD Drive  -  09/28/00 EDN Design Idea   LCDs find wide use in portable instruments, thanks to their attractive display and low power consumption. The circuit in Figure 1 is an effective driver for LCDs. The circuit comprises two main sections—the ICM7211 drivers (IC2 . . .  [by Luo Ben Cheng, Chinese Academy of Science, Beijing, China ]

Pulsed laser driver  -  Schematic only, no circuit description. . .  [Designer's name not given]

Pulsed LED Test Circuit  -  This circuit is designed to test visible and infrared LEDs in pulsed mode operations. It can drive the LED with peak currents in excess of 10 Amps. A light detector nearby can monitor the response time and intensity of the LED under test . . . [Circuit by David A. Johnson P.E.,  06/17/00]

Pulsing Charge Pump Drives Capacitive Loads  -  11/05/98 EDN Design Idea   (Several circuits here, scroll to find this one)  The test circuit in Figure 1efficiently drives various capacitive loads, such as memory cells and simple capacitors, so that you can observe their leakage effects. Essentially,. . .  [by Paul J Rose, Mental Automation Inc, Bellevue, WA]

Pushbutton Controlled Up/Down Ramping Light  -  There are times when you want a lamp to gradually change from dark to light and from light to dark, with each push of a pushbutton switch. The circuit below performs this control function using a flip/flop and a classic pulse width modulation or PWM . . . [Circuit by Dave Johnson P.E.,  03/22/09]

Push-Pull Complementary Power MOSFET Driver  -  Circuit Ideas for Designers App Note - . . .  [Advanced Linear Devices, Inc]

Push-pull driver provides isolated 5V at 1A  -  03-Mar-00 EDN Design Idea   The circuit in Figure 1 converts a regulated 5V input to an isolated 5V output with 1A current-output capability. IC1, a pushpull transformer driver, powers a pair of cross-coupled power MOSFETs in a flipflop-like configuration. In. . .  [by Ron Young, Maxim Integrated Products, Sunnyvale, CA]

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