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Scheme adds sequencing and shutdown Control to regulator:
10/30/03 EDN Design Ideas / (added 1/05) Modern microprocessor or FP-GA-based circuits require separate and independent
power-supply voltages for the core and the I/O circuits. Some devices require stringent control of the turn-on characteristics and sequencing
of these multiple power supplies to avoid internal parasitic current flows and consequent latch-ups.... |
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Selecting the Right Series Voltage Reference for Absolute Accuracy Voltage Output
DAC Designs: Maxim Application Notes / 754 / Oct-08 (app note added 6/06) |
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Sepic Reference
Design: This design is for a widely varying, non-isolated 24 volt input with a variable output voltage. A Sepic topology is used as
the input voltage can be lower or higher than the desired output voltage. The design makes use of the UCC3813 which is a CMOS controller with
low power dissipation and low current standby but with a good drive capability. (added 3/05) |
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Servo loop improves linear regulator efficiency: 07/08/04
EDN Design Ideas / (added 1/05) Linear regulators are easy to implement and have better noise and drift characteristics than
switching approaches. Their largest disadvantage is inefficiency: excess energy dissipated as heat. |
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Shielding and Guarding: AN-347 Analog Devices Application Note (app note added 2/06) How to Exclude Interference-Type
Noise. What to do and Why to do it-A Rational Approach |
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Shunt regulator eases power supply start up woes:
10/27/05 EDN Design Ideas / (added 11/05) Ensure regulator start-up under light output load. |
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Shunt regulator improves power amplifier's current-limit accuracy:
2/2/06 EDN Design Ideas / (added 10/06) Additions protect output transistor and downstream circuitry. |
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Shunt
Regulator Provides overVoltage Protection: 01/15/98 EDN-Design Ideas / (added 09/05) The circuit in Figure 1 uses a typical
technique for varying the output voltage of a power supply via a programmable control voltage. Although the topology and schematic details of
the power supply are not critical, the protection technique is novel. |
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Shunt regulator serves as inexpensive op amp in power supplies:
09/15/05 EDN -Design Ideas / (added 11/05) Use low-cost power-regulator IC to replace more costly op amp
in power supplies. |
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Shunt regulator speeds power supply's start-up: 12/16/05
EDN Design Ideas / (added 10/06) Reconfiguring the start-up shunt regulator can reduce bootstrap time. |
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Simple Regulator has one Active Part: 03/16/95 EDN-Design
Ideas / (added 03/03) |
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Simple
Regulator Monitors its Input Voltage: 09/12/97 EDN-Design Ideas / (added 3/03) |
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Simple Regulator Provides ±12V from 5V Source: National Semiconductor
Application Note (app note added 2/06) |
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Simple Ultra-Low Dropout Regulator: DN32 Design Notes (Linear
Technology) (app note added 1/06) |
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Simple V COM adjustment uses any logIC Supply Voltage:
09/30/04 EDN Design Ideas / (added 1/05) All TFT (thin-film-transistor) LCD panels require at least one appropriately tuned
V COM signal to provide a reference point for the panel's backplane. The exact value of V COM varies from panel to panel, so the manufacturer
must program the voltage at the factory to match the characteristics of each screen.... |
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Single Transistor Forward Reference Design: Single Transistor Forward
with Vin 115/220 Vac and Vout 12 V. The output current 10 A with 120 W of output power. (added 3/05) |
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Small Variable Power Supply: (electronic circuit added 10/05) |
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Soft Start power Supply: The output voltage rises slowly and reaches 15 V
in 5 seconds. In order to perform this soft-start function, the LM317 voltage regulator IC requires an external universal PNP transistor
and the L200 uses its internal comparator (pin 2). After switch-on, the rising voltage on the positive side of the charging electrolytic
capacitor slowly turns the (initially conducting) transistor off, thus raising the voltage (relative to ground) on the adjustment pin of the
LM317. In the L200 circuit, the corresponding electrolytic capacitor's rising voltage gradually relaxes the current-regulation loop inside the
L200. (added 10/05) |
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Soft start regulator starts at 0V: 06/06/96 EDN Design
Ideas / (added 2/06) Venerable mechanical meter can measure ultralow currents, with some help. |
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Supply Saves Circuits from Lax Predecessors: 11/23/94
EDN-Design Ideas / (added 3/03) The lab supply in Fig 1 automatically sets its output voltage to zero whenever you switch it on. Thus, the lab
supply can't fry your circuit if the previous user left the voltage turned up too high. The circuit supplies 1 to 25V dc because it uses an
LM317 regulator. When you turn on the supply, the bridge develops a voltage across C1. This voltage causes IC1A and IC1B to trigger, turning
on Q1 via R1. In this case, the voltage at the control input of the three-terminal regulator, IC3, is essentially zero, and the regulator
outputs its minimal voltage, approximately 1.25V.... |
|
Sync. Buck with
Integrated FET Forward Dual Sync. Buck Reference Design: Sync. Buck with Integrated FET, Forward, Dual Sync. Buck with Vin of 48.
Vout of 15 V, 3.3 V, 1.8 V, 1.5 V. The output power is 47 W. (added 3/05) |
|
Synchronous Buck Reference Design: This reference design is synchronous
Buck/Boost converter that can deliver up to 3.8 A of continuous current at -5 V from a 5 V input. This topology uses a synchronous buck
controller (TPS5103) referenced to the negative output rail. The synchronous MOSFETs allow this design to achieve a peak efficiency of 88%. In
addition, the TPS5103 provides a soft-start function and over-current protection. (added 3/05) |
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Terminal Regulator is Adjustable: National Semiconductor
Application Note 08-Nov-2000/ (app note added 3/03) |
|
The Effect of Long-Term Drift on Voltage References: AN-713 Analog
Devices Application Note (app note added 2/06) |
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The LM105-An Improved Positive Regulator: National Semiconductor
Application Note (app note added 2/06) |
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The ZLDO Series of Low Dropout Voltage Regulators: Zetec Semiconductors
Applications Notes The ZLDO series of regulators provide the lowest dropout voltage currently available in their class. Application examples
covering dropout and other important features of the series are discussed. (app note added 2/06) |
|
Thermometer Applications of the REF-02: AN-18 Analog Devices App Note (app note added 2/06) |
|
Tiny Regulators Drive White LED Backlights #2: Linear Technology Design
Note 231 (app note added 02/05) |
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Tiny Regulators Drive White LED Backlights: DN231 Design Notes
(Linear Technology) (app note added 2/06) |
|
Transformerless Power Supply: An interesting application
of capacitive reactance, which is used to reduce the normal, 117-volt supply to 12-volts DC, regulated, delivering about 100 ma.
(circuit design added 7/06) |
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Transformerless Power Supply: Important Warning: This is a power supply project without using a power supply. This can save the
expense of buying a transformer, but presents potentially lethal voltages at the output terminals. Under no circumstances should a beginner
attempt to build such a project. (added 6/03) |
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Transistor quickly wakes sleeping LDO: 09/01/98 EDN-Design Ideas / (added
110/05) Portable systems, such as telephone handsets, make extensive use of low-dropout (LDO) regulators. These components provide
noise-sensitive parts with a stable power-supply line. When a telephone enters standby mode, most of the circuits go to sleep by disabling the
LDO's outputs. Operating ..... |
|
Two AA cells power step down regulator: 01/07/99 EDN-Design Ideas /
(schematic / circuit added 10/02) [Note: File contains multiple circuits scroll to find this circuit] DC/DC conversion is
particularly challenging when both the input and output voltages are low. Step-up ICs that operate with inputs lower than 1V are available,
but step-down ICs that accept input voltages near 2V are not. Thus, providing efficient power for the low-voltage CPU in a handheld product
can be a problem if the power source is a two-cell AA battery..... |
|
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. The nominal switching frequency for this converter is approximately 400 kHz. The UCC3809 is configured with a
50% duty-cycle clamp. (added 3/05) |
|
UCC3819 250-W PFC Boost Follower PreRegulator Design: This is an App Note
that describes a reference design. This paper reviews the benefits of a boost follower topology and the design of a 250-W PFC boost follower
preregulator. (added 3/05) |
|
UCC38C42 25-Watt Self-Resonant Reset Forward: This is an application note
that describes a reference design. This reference design presents a self-resonant reset forward converter using the UCC38C42 BiCMOS Low-Power
Current-Mode PWM Controller. The input voltage for this converter is compatible with the telecom input voltage range of 36 VDC to 72 VDC. The
converter is designed to operate at a switching frequency of 525 kHz, requires minimal parts, and supports an isolated 2.5-V 10-A output.
(added 3/05) |
|
Ultra Low Drop Linear Regulator: (electronic Circuit / Schematic added
10/04) |
|
Ultra Low drop linear Voltage Regulator: The circuit is a MOSFET based
linear voltage regulator with a voltage drop of as low as 60 mV at 1 ampere. Drop of a fewer millivolts is possible with better MOSFETs having
lower RDS(on) resistance. The circuit in Fig. 1 uses 15V-0-15V secondary from a step-down transformer and employs an n-channel MOSFET IRF 540
to get the regulated 12V output from DC input,... (added 10/05) |
|
Ultra Low noise Low dropout regulator achieves 6 nV/√Hz noise floor:
06/23/05 EDN Design Ideas / (added 2/06) LDO has ultralow-noise output. |
|
Ultra-Low Dropout Regulator: DN32 Design Notes (Linear Technology)
(app note added 1/06) |
|
Understanding and Applying Voltage References: AN82 Linear Technology
Just how do bandgaps and buried Zeners stack up against Weston cells? Did you know your circuit board may induce more drift in a reference
than time and temperature? Learn the answers to these and other commonly asked reference questions ranging from burn-in recommendations to
ΔVBE generation in this Application Note. |
|
Universal DC-to-DC Converter: (electronic (schematic / circuit added
4/02) |
|
Universal PSU: A Universal Power supply based on the L200 regulator,
which includes an outboard pass transistor to boost output currents up to 4 amps. (added 11/05) |
|
V COM Adjustment uses Any Logic Supply Voltage: 09/30/04
EDN Design Ideas / (added 1/05) All TFT (thin-film-transistor) LCD panels require at least one appropriately tuned V COM
signal to provide a reference point for the panel's backplane. The exact value of V COM varies from panel to panel, so the manufacturer must
program the voltage at the factory to match the characteristics of each screen.... |
|
Variable 3 to 24 Volt/3 Amp Power Supply: regulated power supply can be
adjusted from3 to25 volts and is current limited (added 5/02) |
|
Variable DC Power Supply: Voltage range:0.7-24 Volt
Current limiting range:50mA-2A (added 9/04) |
|
Variable Dual Lab Power Supply: can supply from +/-1.2V
up to about +/-25V, will current limit at around 800mA (added 5/02) |
|
Variable load tests Voltage sources: 07/19/01 EDN Design
Ideas / (added 1/05) The circuit in Figure 1 serves as a variable, current-sink load for testing voltage sources. You use
digital commands to set the load current of the device under test over a wide range, independently of the device under test's output voltage.
The circuit comprises an AD558 DAC, IC1, which provides a reference voltage at Point A.... |
|
Variable Power Supply #1: based on versatile L200 voltage regulator,
independent voltage (3-15V) and current (10mA-2A) limits (added 5/02) |
|
Variable Power Supply #2 : (electronic design / schematic added 2/05) |
|
Variable Power Supply #4: (electronic circuit added 04/05) |
|
Variable Power Supply 1- 30 Volt@ 1.5A: This is a simple,
but low-ripple power supply, and an excellent project if you're starting out in electronics. It will suit your needs for most of your
bench testing and prototype applications. The output is adjustable from 1.2 volts to about 30 volts. Maximum current is about 1.5
amps which is also sufficient for most of your tinkering. It is relatively easy to build and can be pretty cheap if you have some or all
the required parts. (added 11/05) |
|
Variable Voltage and Current Power Supply: (electronic (schematic /
circuit added 4/02) |
|
Varying Brightness AC Lamp: SCR is used to slowly vary the intensity of
a120 volt light bulb by controlling the Time that the AC line voltage is applied to the lamp during each half cycle (added 4/02) |
|
Versatile Micropower Voltage Reference Provides Resistor Programmable Output from
0.4V to 18V: DN351 Design Notes (Linear Technology) (app note added 1/06) |
|
Voltage Inverter II: simple and inexpensive circuit can
produce a dual (positive and negative) voltage from a single supply input, extremely useful for powering OpAmp and other circuits that require
a dual voltage from a single battery (added 2/03) |
|
Voltage Reference Circuit Collection: AN42 Linear Technology A wide
variety of voltage reference circuits are detailed in this extensive guidebook of circuits. The detailed schematics cover simple and precision
approaches at a variety of power levels. Included are 2 and 3 terminal devices in series and shunt modes for positive and negative polarities.
Appended sections cover resistor and capacitor selection and trimming techniques. |
|
Voltage Reference improves JFET: 10/26/00 EDN-Design Ideas / (added
05/03) /The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's VP and IDSS variations.
These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a fixed R1. Most users of
JFET current-sources sample VP and IDSS for each lot of JFETs and then select R1 by first solving the quadratic equation ID=IDSS(1–VGS/VP)2
for VGS and then solving..... |
|
Voltage Reference is software Programmable: 08/18/05 EDN Design Ideas
/ (added 11/05) Obtain extra reference voltages from existing ones. |
|
Voltage Reference sets Current limit : 11/19/98
EDN-Design Ideas / (added 2/06) |
|
Voltage Regulator controls scanner-lamp brightness:
05/13/99 EDN-Design Ideas / (added 2/06) |
|
Voltage Regulator goes Digital: 11/24/99 EDN-Design Ideas
/ (added 5/02) / Power consumption and failing batteries are key issues in battery-operated applications. Features in the new generation of
series voltage regulators address these concerns. For example, National Semiconductor's LP2951 micropower voltage regulator provides a
logic-level output signal indicating a low regulated .... |
|
Voltage Regulator: simple regulated12V power supply using1-transistor regulator circuit (added 5/02) |
|
Wide Adjustable Range PNP Voltage Regulator: National Semiconductor
Application Note (app note added 2/06) |
|
Wide Input Range High Efficiency DDR Termination Power Supply Achieves Fast
Transient Response: DN281 Design Notes (Linear Technology) (app note added 1/06) |
|
Wide range regulator delivers 12V 3A output from 16 to 100V source:
06/23/05 EDN Design Ideas / (added 10/05) Buck regulator tackles high input voltages. |
|
Wide range Voltage Regulator automatically selects operating mode:
06/09/05 EDN Design Ideas / (added 10/05) Regulator seamlessly adapts to wide output range. |
|
Zener Voltage Regulation and Thermal Resistance: MicroNote 204 from
Microsem (app note added 6/06) |
|
Zener Voltage Regulation with Current: MicroNote 202 from Microsem
(app note added 6/06) |
|
Zener Voltage Regulation with Temperature: MicroNote 203 from Microsem
(app note added 6/06) |
|
ZLDO Series of Low Dropout Voltage Regulators: Zetec
Semiconductors Applications Notes The ZLDO series of regulators provide the lowest dropout voltage currently available in their class.
Application examples covering dropout and other important features of the series are discussed. (app note added 2/06) |
