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A standard technique for generating analog voltages using µCs is to use a PWM output and filter the signal with a simple RC filter (Figure 1). The vol... 阅读全文
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Short-circuit protection is an obvious requirement for a power supply, especially when its load connects to a cable that's subject to damage. Many mod... 阅读全文
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The circuit inFigure 1is a good choice if you need a power supply with high efficiency and you don't want to use expensive dc/dc-converter ICs. The he... 阅读全文
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The circuit inFigure 1produces a single debounced pulse each time you press S1. Moreover, the circuit uses only logic power from the remote pull-up re... 阅读全文
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Many applications require current sources rather than voltage sources. When you need a high-current source, using a linear regulator is inadvisable, b... 阅读全文
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Linear Technology's recently introduced LTC4300 chip buffers I2C clock and data lines to and from a hot-swappable card. This task is difficult because... 阅读全文
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The achievable accuracy for systems with multiple ADCs depends directly on the reference voltages applied to the ADCs. Medical-ultrasound-imaging syst... 阅读全文
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The easy way to clamp a signal to a given value is to use two zener diodes, connected back-to-back. This method has several disadvantages. The accurac... 阅读全文
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ECL circuits typically have relatively small logic spans of approximately 800 mV. Because of the small span, to drive TTL circuits from ECL levels nor... 阅读全文
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A number of circuits, such as level detectors and AM demodulators, benefit from a rectifier with a low offset voltage. Silicon diodes have an offset o... 阅读全文
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The circuit inFigure 1uses a minimal number of external parts to raise the maximum output current of a 0.5A buck switching-regulator IC to more than 6... 阅读全文
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Boost converters, like other switchers, have traditionally received their control signals from a dedicated circuit. However, a recent trend is to inte... 阅读全文
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The schematic inFigure 1shows a way to increase the power available from a current-limited 5V supply by adding power from a –5V supply. The dc/dc conv... 阅读全文
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In certain dc/dc-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circ... 阅读全文
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AC signals can emanate from many sources, and many of these sources are incompatible with the most popular interface voltages, such as TTL. A temptati... 阅读全文
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This Design Idea explores level-shifting an I2C bus from 5V/ground (positive domain) to ground/–5V (negative domain). In multisupply systems, you some... 阅读全文
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Low-ripple-voltage positive-to-negative dc/dc converters find use in many of today's high- frequency and noise-sensitive disk drives, battery-powered ... 阅读全文
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The popular USB interface can charge a portable device while transferring data. But for high-capacity batteries, the 500-mA output current of USB host... 阅读全文
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Many embedded-microcontroller applications require generation of analog signals. An integrated or stand-alone DAC fills the role. However, you can oft... 阅读全文
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The SEPIC (single-ended, primary-inductance-converter) topology is generally a good choice for voltage regulators that must produce an on output volta... 阅读全文
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LT1961 升压型稳压器造就了兼具升压和降压能力的扁平状SEPICTransformerless dc/dc converter produces bipolar outputsWell-regulated, dual-polarity power supplies find wide use i... 阅读全文
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Dual-polarity supply provides ±12V from one ICVC (Pin 1): Error Amplifier Output Pin. Tie external compensationnetwork to this pin or use the internal... 阅读全文
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You can easily use a PC's printer port for serial-EEPROM programming. You can use a device-programmer circuit used to program the MicroWire serial EE-... 阅读全文
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Added components improve switching-regulator stability 阅读全文
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Targeting use in portable-system applications that require raising a battery's voltage to a higher level, IC boost regulators often include output tra... 阅读全文
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Synchronous buck regulators offer high efficiency and are popular in applications in which available input voltages are 12V or less. However, as input... 阅读全文
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For containing large amounts ofbulk capacitance, controllinginrush currents poses problems.Thesimplest approach involves placing aninrush-limiting res... 阅读全文
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The circuit inFigure 1delivers programming voltages to an EEPROM under the control of an external DAC (not shown).You can replace the DAC with a poten... 阅读全文
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The classic LM317 adjustable-output linear voltage regulator offers a relatively high, if package-dependent, current-handling capability. In addition,... 阅读全文
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Buck regulators find wide application as step-down regulators for converting large positive input voltages into a smaller positive output voltages.Fig... 阅读全文
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You would normally use a series linear regulator or a dc/dc converter to obtain 3V dc from a higher supply. However, when breadboarding a concept, you... 阅读全文
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In new mixed-voltage systems, it is often necessary to level-shift a control signal from a high level to a low level. An open-drain device, such as th... 阅读全文
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http://www.edn.com/design/analog/4329365/Combine-two-8-bit-outputs-to-make-one-16-bit-DAC 阅读全文
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This Design Idea stems from the limited availability of IC voltage regulators that can meet key USB-power specs, coupled with the need for turn-on seq... 阅读全文
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Voltage-regulator design for high output currents can be a critical and difficult task. Although voltage regulators with 1A maximum output current are... 阅读全文
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Adding a current-mirror circuit to a typical boost circuit allows you to select the amount of boost voltageand to ensure a constant difference between... 阅读全文
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The step-up switching-converter circuit inFigure 1presents a familiar problem: If you shut down boost converter IC1by pulling itsinput low, external i... 阅读全文
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In multiple-output power supplies in which a single supply powers circuitry of vastly different current draws, two perplexing steps are sensing the cu... 阅读全文
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Most isolated, offline SMPSs (switched-mode power supplies), including flyback, forward, and resonant, must operate at input voltages of 90 to 260V rm... 阅读全文
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Batteries are the typical power sources for portable-system applications, and it is not unusual these days to find microcontroller-based portable syst... 阅读全文