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1.2 Volt Reference: National Semiconductor
Application Notes,04-Nov-1995 |
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Add an auxiliary voltage to a buck regulator:
10/31/2002 EDN - Design Ideas / You often need more
than one regulated output voltage in a system. A
frequently used and reasonably simple way to create
this auxiliary output voltage is to add a second
winding to the output inductor, creating a coupled
inductor or a transformer, followed by a diode to
rectify (peak-detect) this output voltage.. |
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Buck boost regulator suits battery operation :
09/04/03 EDN-Design Ideas / A buck/boost converter
can step a voltage up or down. Such a converter is
appropriate for battery-powered applications. One
application derives a regulated 14.1V at 1A from 12V
solar panels with 9 to 18V variation. In this type
of battery application, efficiency is an important
factor; hence, this design uses an inexpensive
synchronous-rectifier-based MC33166/7 circuit.... |
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Buck regulator operates without a dedicated clock
: 08/21/03 EDN-Design Ideas / Most switching
regulators rely on a dedicated clock oscillator to
determine the switching frequency of operation. A
dedicated oscillator circuit within the power
controller usually generates the clock signal. A
class of hysteretic switching regulators can
actually operate at a relatively fixed frequency
without a clock, even with changing input-line and
output-loading conditions.... |
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Buck Regulator Terminates Fast Data Buses:
07/20/95 EDN-Design Ideas |
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Buck Regulator uses Step up Controller: 11/09/95
EDN-Design Ideas |
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Circuit Measures Small Current in DC Servo Motor:
12/07/01 EDN-Design Ideas |
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Circuit Measures Small Currents Referenced To
HighVoltage Rails : 01/07/02 Electronic Design -
Ideas for Design / Designs that need to measure
small signals riding on high-voltage power rails
suggest the use of isolation devices. However, a
high-common-mode-voltage instrumentation amplifier
used with a rail-to-rail input and output amplifier
can recover the... |
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Circuit provides reference for multiple ADCs:
01/24/2002 EDN - Design Ideas / The achievable
accuracy for systems with multiple ADCs depends
directly on the reference voltages applied to the
ADCs. Medical-ultrasound-imaging systems, for
example, commonly include a large number of ADCs in
the system's beam-former electronics, with the ADCs
usually organized in groups of 16, 24, 32, and so
on. . |
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Circuit provides reference for multiple ADCs:
01/24/2002 EDN - Design Ideas / The achievable
accuracy for systems with multiple ADCs depends
directly on the reference voltages applied to the
ADCs. Medical-ultrasound-imaging systems, for
example, commonly include a large number of ADCs in
the system's beam-former electronics, with the ADCs
usually organized in groups of 16, 24, 32, and so
on. . |
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Digital potentiometer programs and stabilizes
voltage reference: 05/30/2002 EDN - Design
Ideas / The potentiometer portion of a mixed-signal,
digitally programmable potentiometer adds
variability to an analog circuit, and its digital
controls provide programmability. You can use a
digital potentiometer in two ways in an analog
circuit. You can use it as a two-terminal variable
resistance, or rheostat, or as a three-terminal
resistive divider.. |
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For Just Pennies, Boost Current From Negatimve
Linear Regulator : 11/25/02 Electronic Design -
Ideas for Design / Adding four components to a
negative linear regulator (U1 in the figure)
increases the load current by 60%. The additional
pass transistor and associated resistors cost less
than $0.17 in 1000-unit... |
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Get buck boost performance from a boost regulator:
07/11/2002 EDN - Design Ideas / The SEPIC
(single-ended, primary-inductance-converter)
topology is generally a good choice for voltage
regulators that must produce an on output voltage
that falls in the middle of the input-voltage range,
such as a 5V output from a 2.7 to 6V input, The
topology has some disadvantages, however. The
efficiency of a SEPIC circuit fares worse than that
of buck and boost regulators, and SEPIC desig.... |
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IC Voltage Reference has 1 Ppm Per Degree Drift:
National Semiconductor Application Notes,04-Nov-1995
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Linear Brief 41 Precision Reference Uses Only Ten
Microamperes: National Semiconductor Application
Notes,02-Mar-1999 |
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Measurement Circuit Features High CommonMode
Rejection : 07/22/02 Electronic Design - Ideas
for Design / Modern measurement systems often
operate with single 5-V power supplies, yet their
input signals may have large common-mode voltages
that exceed the supply by tens or hundreds of volts.
Also, unless the converter is driven differentially,
the noise on... |
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Micropower Voltage Reference: National
Semiconductor Application Notes,28-Jun-1996 |
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Obtain higher voltage from a buck regulator:
05/29/03 EDN-Design Ideas / Several semiconductor
vendors'current-mode buck controllers have
input-voltage ranges of 30 to 36V but have
output-voltage ranges from the reference voltage to
approximately 6V. This output-voltage constraint
arises from the common-mode-voltage limitation of
the current-sense amplifier. In real-world
applications, the power-supply designer must be able
to generate high output voltage for printe......
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Positive regulator makes dual negative output
converter: 06/26/03 EDN-Design Ideas /Some
systems, such as optical networks, require more 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 positive supply, typically 5 or
12V. Independently creating each of the two negative
voltages requires the use of two switching-regulator
ICs... |
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Positive regulator makes negative dc/dc converter:
12/26/2002 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 regula |
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Reference stabilizes exponential current:
10/25/2001 EDN - Design Ideas / In an antilog
converter, the difference between the base voltages
of two transistors sets the ratio of their collector
currents: The use of matched transistors balances
the first-order temperature coefficient but leaves a
temperature-dependent gain term, q/kT. Classic
antilog circuits use a thermistor in the drive
circuitry to correct this temperature dependency. . |
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References for a / D Converters: National
Semiconductor Application Notes,04-Nov-1995
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Regulator Makes Dual Tracking Reference:
11/07/96 EDN-Design Ideas |
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Simple Regulator has one Active Part: 03/16/95
EDN-Design Ideas |
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Supply delivers pin programmable multiple references:
05/01/03 EDN-Design Ideas / In the circuit of
Figure 1, the REF01, IC1, is a buried-zener-diode-based,
precision 10V reference that features minimal noise
and drift over temperature. The circuit provides not
only the 10V output of the REF01, but also a 5V
output that a REF02 reference would deliver. In
addition, the circuit provides 5 V 10V, and an
unbalanced dual reference, the sum of whose voltages
is precisely 10V... |
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Supply saves Circuits from lax Predecessors:
11/23/94 EDN-Design Ideas |
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Two Acels Power Step Down Regulator: 01/07/99
EDN-Design Ideas / PDF contains multiple circuits -
scroll to find this circuit.
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Ultra Low Drop Linear Regulator:
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Voltage Reference improves JFET: 10/26/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to
find this circuit |
