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Circuit Techniques for Avoiding Oscillations in Comparator Applications:
National Semiconductor Application Note (app note added 2/06) |
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Comparator Adds Current Limit to V2 Controller: 05/21/98 EDN-Design Ideas /
(added 11/05) The subroutine "FASTBCD" (Listing 1) for 8051 µPs quickly converts
16-bit binary to 24-bit BCD data. The conversion algorithm involves left-shifting bits
from the high-order bit of the binary number into the carry bit while left-shifting
the carry bits into the low-order bit of a BCD shift register using BCD left-shift
operations. .... |
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Comparator Detects Failed Telecomm Supplies: 06/22/00 EDN-Design Ideas /
(added 5/03) /Detects when telecomm power supplys48V output drops below its nominal
value, uses an isolated comparator to monitor two48V telecomm supplies (of either
polarity) / PDF contains multiple circuits scroll to find the one of interest |
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Comparator Exhibits Temporary Hysteresis: 10/14/00 EDN Design Ideas /
(added 5/05) |
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Comparator has Independent Trip Voltages: 07/22/99 EDN Design Ideas /
(added 11/05) |
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Comparator has Programmable Limits: 07/08/99 EDN Design Ideas / (added
11/05) [Note: File contains multiple circuits. Scroll to find this one.]
The circuit in Figure 1 combines a dual buffered D/A converter and dual four-input
comparator to configure a comparator circuit .... |
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Comparator Improves Regulator's Efficiency: 04/28/94 EDN-Design Ideas /
(added 5/03) The UC384X family of current-mode PWM regulators requires a current shunt
or some other component to develop a voltage proportional to the output current. This
shunt must develop a 1V signal at full load. For off-line supplies, the 1V
requirement is not hard to meet because of the high voltage on the supply's dc bus.
However, if you want to use a UC384X regulator in a low-voltage circuit, the 1V drop
becomes undesirable. Lowering the shunt's value is not a good idea because the maximum
current would rise to an unacceptable value in short-circuit or overload conditions.
The circuit in Fig 1 shows an 11W current-mode flyback converter.....
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Comparator Provides Stable Hysteresis: 03/18/99 EDN-Design Ideas / (added
5/03) Unless a voltage-comparator circuitis sampling an extremely clean signal, the
comparator always requires some hysteresis. Traditional comparator circuits obtain the
required hysteresis by using positive feedback derived from the ratio of two
resistors. The voltage at the noninverting input is the superposition.... |
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Comparator uses Signal Dependent Hysteresis: 03/26/98 EDN-Design Ideas /
(added 03/03) A project posed the challenge of replacing existing analog
potentiometers (used to set brightness and contrast levels) in video monitors with
digitally controlled potentiometers. The different brands and models of monitors
presented widely varying voltages across the potentiometers.... |
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Comparators Form 3 to 5 Volt or 5 to 3 Volt Translator/Tranceiver: 09/02/96
EDN-Design Ideas / (added 3/03) In many recent systems, you often need to interface 3V
signals with higher voltages within the system. In some cases, it's necessary to
interconnect 3 and 5V open-collector transceivers.Figure 1 shows one example, in which
multiple multidrop communications devices interconnect. In systems where no control
lines are available for interfacing, the translating transceiver must control
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Comparing the High Speed Comparators: National Semiconductor Application
Note (app note added 2/06) |
