Circuits & Schematics: power supply - 9

81. Micropower Op Amp Drives 8-Channel 18-Bit Simultaneous Sampling ADC without Compromising Accuracy or Breaking the Power Budget
    Guy Hoover
    Circuits Analogue Design Linear Technology LTC2348-18 LT6020
    .. ADC itself, often with a maximum offset spec that is well above that of the ADC. If multiple ADC channels are required, the power dissipation from these drivers quickly rises to unacceptable levels. If 18-bit precision is required (SNR, THD, ...
    .. Note 541 The op amps used to drive 18-bit analog-to-digital converters (ADCs) typically draw as much supply current as the ADC itself, often with a maximum offset spec that is well above that of the ADC. If multiple ...
    Apr 4, 2016

82. Why limit your power supply's input range?
    Circuits Supply Texas Instruments TPS61042DRBT
    .. only a cursory look at the input-voltage ratings of your power-supply IC can limit the usable input-voltage range. With careful examination of an IC's operating ...
    Sep 28, 2021
83. Flip ON Flop OFF: high(ish) voltages from the positive supply rail
    Stephen Woodward
    Circuits Supply Texas Instruments CD4069UB
    .. seen lots of interesting conversations and Design Idea (DI) collaboration devising circuits for power switching using inexpensive (and cute!) momentary-contact SPST pushbuttons. A recent and interesting extension ...
    .. high voltage feature, Jayapal’s design switches the negative (V SS a.k.a. “ground”) rail of the incoming supply instead of the (more conventional) positive (V DD ) rail. Of course, there’s absolutely nothing ...
    Aug 11, 2025
84. Voltage Down-Converter Lets Two-Cell LiPo Battery Power 6-V Devices
    Circuits Supply Power
    .. Martin Lithium-polymer (LiPo) batteries have a higher power density than most other battery technologies. They also deliver a higher nominal voltage per cell: 3.7 V ...
    .. switched dc waveform, such as lamps, relays, some motors, and small heaters. It is not a regulated and filtered power supply. Comparator U1a, one of four in the LM339 , is connected as an astable multivibrator that free-runs at ...
    May 5, 2011
85. Offline supply drives LEDs
    T A Babu
    Circuits Light Power
    .. LEDs lit when AC voltage drops. TA Babu, India LEDs need power when rectified ac-mains voltage drops during its cycle. The circuit in Figure 1 lets you use an inductor-less, ...
    .. ac-mains voltage drops during its cycle. The circuit in Figure 1 lets you use an inductor-less, switching, offline power supply as an LED driver for emergency-exit signs and neon-light replacements. The design uses off-the-shelf ...
    May 12, 2011
86. MOSFET Provides High Power at Low Loss
    Camilo Quintáns Jorge Marcos
    Circuits Power LM393
    .. diodes often have a dropout voltage of approximately 1.2V for silicon power diodes. That voltage drop causes power diodes to dissipate considerable power, resulting in a loss of ...
    .. diodes. That voltage drop causes power diodes to dissipate considerable power, resulting in a loss of efficiency in a power supply. In a photovoltaic panel with 120W of power and 24V nominal voltage, an antireturn diode may cause a power ...
    May 17, 2011
87. Multiple power supplies fortify high-side gate control
    Steven Hendrix
    Circuits Supply Microchip MIC4680
    .. a recent design project, a robust power supply was needed to control the gates of high-side FETs. Optocouplers readily translate the logic signals up ...
    Feb 14, 2024
88. Dual-Input Power Reset Stops Automotive Software Runaway
    Circuits Automotive Supply Infineon TLE7272-2
    .. implementation of an external watchdog timer, software watchdog timer, or some other software strategies while others use power on reset (POR) as the best alternative. In automotive systems, however, fault conditions in which a signal ...
    .. signal for system reset is risky. A power-up reset would be more reliable, but removing and reconnecting the battery supply to the automotive electronic control unit (ECU) can be laborious and take considerable time. An alternative ...
    Aug 4, 2020
89. Use op amps to make automatic-oring power selector
    Circuits Power
    .. manual switches, but automatic switching is preferable. You usually want to use the highest-available input voltage to power your system. You can accomplish this task using a Schottky-diode ORing scheme (Figure 1). Unfortunately, the ...
    .. the application of voltage ORing to positive dc-power rails. The P-channel-MOSFET design is suitable for low-power, single-supply systems operating at 3.3V or higher, and the N-channel MOSFET fits situations in which the bus voltage is ...
    Dec 11, 2011
90. 300 Watt MOSFET Real HI-FI Power Amplifier
    Circuits Audio
    .. average listening level is normally less than 10 watts, my design approach was to create an amplifier with ample reserve power, but biasing it for class A at average listening levels reducing cross-over distortion to extremely low levels. ...
    .. .009% at maximum power The amplifier consists of two completely separate monaural amplifiers each channel has its own power supply, resulting in zero inter-channel cross talk, a common phenomenon in amplifiers sharing the same power supply. ...
    Jan 17, 2012

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