Method Provides Fast Glitch Free Isolation of I 2 C and Smbus Signals:  06/24/04 EDN Design Ideas  /  (added 2/05)  I 2 C is a popular serial protocol for power controllers, ADCs and DACs, EEPROMs, and other devices. In certain data-acquisition and power-control situations, you must isolate the I2C master from one or more slave devices for noise, grounding, or safety issues. Also, although 128 peripherals may connect to the bus, at some point, differences in ground potential and excessive bus capacitance ......

Method Provides Overpower Protection for Quasiresonant Supplies:  10/28/04 EDN Design Ideas Online (added 1/05) The main characteristic of quasiresonant switch-mode power supplies is that they exhibit a varying frequency when the input voltage changes. 

Methods Reduce Input Ripple for All Charge Pumps:  Maxim Application Note #2027 (app note added 7/03)

Miniature Precision Negative Reference Requires No Precision Resistors:  Maxim App Note #824 (app note added 7/03)

Negative Supply from Single Positive Supply:  Opamps are very useful. But one of their major drawbacks is the requirement of a dual supply. This seriously limits their applications in fields where a dual supply is not affordable or not practicable. This circuit solves the problem to a certain extent. It provides a negative voltage from a single positive supply. This negative voltage together with the positive supply.... (added 10/05)

Negative Voltage Generation using 555 Timer:  (electronic circuit added 4/05)

Negative Voltage Generator:  takes in +12V and outputs around -11V (added 4/02)

Negative Voltage Load Switch:  The good thing about this design is that i can make use of the system i/o voltage to control the on/off and this is the whole idea. However, there are many many type of load switches that turn of negative voltages…. (added 3.06)

Network Linearizes DC/DC Converter's Current Limit Characteristics:  10/13/05   EDN -Design Ideas  / (added 11/05)   Thermistor adds to efficiency, eliminates sense resistor.

One 9 Volt Battery Gives +18 +25 +33V:  This circuit is based on MAX1044 is a charge pump converter. (added 4/02)

Power over Ethernet: Sync Flyback Reference Design:  This reference design presents an alternative to the typical boost power regulator. A buck converter IC is used to generate a higher voltage needed by the white light LED power from a Ni-Cd battery. This circuit operates by turning the high switch on, connecting the battery voltage across the inductor. Once sufficient energy is stored in the inductor, the high side.... (added 3/05)

Power Supply Fits into Small Spaces:  11/13/03 EDN Design Ideas  /  (added 1/05)  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. Figure 1 shows a simple and cost-effective solution that combines a voltage inverter and a voltage ......

Power Supply:  (electronic circuit added 4/05)

Pulsing Charge Pump Drives Capacitive Loads:  11/05/98 EDN-Design Ideas / (added 6/06)  

Reduce Emi by Sweeping a Power Supply's Frequency:  05/27/04 EDN Design Ideas  /  (added 02/05)  Switching power supplies can be notorious noise generators. You should prevent this noise, which is conducted, Radiated, or both, from returning to the input source, where it can potentially wreak havoc on other devices operating from the same input power....

Regulated 12V Supply:  (electronic circuit added 4/05)

Regulated Charge Pump Delivers 50ma:  Maxim App Note #35 (app note added 7/03)

Regulated Step Up Converter Provides High Efficiency Without Inductors:  Maxim Application Note #44 (app note added 7/03)

Self Modifying Code Extends Addressing Mode:  12/17/98 EDN-Design Ideas  / (added 03/05)   As just about any assembly-language programmer knows, self-modifying code (SMC) is usually undesirable, unintentional, and destructive. However, the SMC routine in Listing 1 is extremely useful to extend the indexed, 16-bit offset addressing mode of the venerable HC05 µC from 8 bits, or 256 locations, to the full 13-bit (8-kbyte) memory address space that the µC’s architecture supports. This routine is very useful for error tables, text messages tables, or any array manipulation for a large number of elements....

Simple +5V Power Supply Circuit:  (electronic circuit added 4/05)

Simple Circuit Provides +5 Volt Gate Bias From  48 Volt Input:  Maxim Application Note #1803 (app note added 7/03)

Simple DC/DC Converter Increases Available Power in Dual Voltage System:  01/08/04 EDN Design Ideas  /  (added 1/05)  The schematic in Figure 1 shows a way to increase the power available from a current-limited 5V supply by adding power from a -5V supply. The dc/dc converter generates a single 12V, 150-mA (1.8W) output from two regulated and current-limited input sources at 5V, 300 mA (1.5W) and -5V, 300 mA (1.5W)....

Simple Methods Reduce Input Ripple for All Charge Pumps:  Maxim Application Note #2027 (app note added 7/03)

Simple Power Supply Fits into Small Spaces:  11/13/03 EDN Design Ideas  /  (added 1/05)  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. Figure 1 shows a simple and cost-effective solution that combines a voltage inverter and a voltage ......

Simple Power Supply:  (electronic circuit added 4/05)

Simple Switching Power Supply:  (electronic circuit added 09/05)

Supplying Power via the1 Wire Bus:  Maxim App Note #949 (app note added 7/03)

Switch Mode DC Supply:  The switching power supply, shown in the schematic, provides12 volts, at10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit. The supply was constructed in1984 and is variable frequency, as opposed to the pulse width modulator (PWM) controllers used today. (added 4/02)

Switched Capacitor IC and Reference Form Elegant48 to +10V Converter:  04/24/03  EDN-Design Ideas / (schematic / circuit added 11/03) A system designer must almost always face a trade-off in choosing the right part for an application. The trade-off usually involves performance, price, and function. An example is the issue of powering circuits from a telecom-voltage source. Telecom systems almost exclusively use high-potential negative rails, such as 48V...

Switching Power Supply:  (electronic circuit added 09/05)

Synchronous Buck Reference Design:  This reference design is a 5Vdc input to 1.65V @ 1A output synchronous buck converter. The controller is the TPS40003 operating at 600KHz. The controller features Predictive Gate Drive, which minimizes the bottom FET body diode conduction time. This provides the benefit of increased efficiency when compared to a standard gate drive method. Very low output ripple voltage and excellent transient load performance are achieved with this design. (added 3/05)