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Constant Current Constant Voltage Converter Drives White LEDs - 09/02/04 EDN-Design
Ideas: LEDs usually take their drive from a constant dc-current source to maintain
constant luminescence. Most dc/dc converters, however, deliver a constant voltage
by comparing a feedback voltage to an internal reference via an internal error
amplifier.....(design idea added 1/05) |
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DAC & flip flops form constant current source - 04/23/09 EDN- Design Ideas,
Using two flip flops, you can program a serial-input DAC to produce a constant 4
mA.....(design idea added 08/09) |
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DN25 Series: Constant Current Sources - Supertex Semiconductors (app note
added 2/06) |
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High Voltage Linear Regulator & Constant Current - Supertex Semiconductors
(app note added 6/06) |
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LND1 Series: Constant Current Sources - Supertex Semiconductors (app note
added 2/06) |
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LT1511 Low Dropout Constant-Current/Constant-Voltage 3a Battery Charger -
DN144 Design Notes (Linear Technology) (app note added 6/06) |
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OpAmp can source or sink current - 03/02/06 EDN-Design Ideas: Bipolar current
source beats familiar Howland-current pump.....(design idea added 05/07) |
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Shunt Constant Current Source - (electronic circuit added 9/05) |
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Signal Sources Conditioners & Power Circuitry - AN98 Linear Technology
Eighteen circuits are presented in this compilation. Signal sources include a
voltage controlled current source, an amplitude/frequency stabilized sine wave
oscillator, a versatile, 0V to 50V wideband level shift and four sub-nanosecond
pulse generators with risetimes as low as 20ps. Five signal conditioners appear; a
unique, .... (added 9/06) |
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Simple dual constant current load tests low current power supplies - 06/21/07
EDN-Design Ideas: You can use a simple 9V-battery-powered constant-current load to
test small power supplies at various loads.....(design idea added 9/08) |
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Simple Variable Voltage Source - The high current regulator below uses an
additional winding or a separate transformer to supply power for the LM317
regulator so that the pass transistors can operate closer to saturation and
improve efficiency. For good efficiency the voltage at the collectors of the two
parallel 2N3055 pass transistors ..... (added 4/05) |
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TSM108 Evaluatin Board 12V to 6V DC/DC Converter - The TSM108 is a step down
controller that features constant voltage and constant current regulation.The
Evaluation Board was designed to allow different converter configurations. Several
options for power semiconductor footprints are available on the PCB in order to
make it adaptable to a wide range of converter output power. In a first step,
..... (app note added 3/05) |
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Variable Voltage Source - The high current regulator below uses an additional
winding or a separate transformer to supply power for the LM317 regulator so that
the pass transistors can operate closer to saturation and improve efficiency. For
good efficiency the voltage at the collectors of the two parallel 2N3055 pass
transistors should be close to the output voltage..... (added 4/05) |
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Zener oscillators - These two circuits are interesting from an academic point
of view. Their practical implementation is rather critical and it is not easy to
get steady operation. Circuit (a) requires a "cooked" zener: connect it first to a
constant current generator, then increase the current.... (added 9/07) |