Circuits & Schematics: power supply - 9

81. Circuit controls ratiometric or simultaneous power-up of multiple rails
    Dirk Gehrke
    Circuits Supply Texas Instruments TPS54310 TPS54610
    .. core voltage and the I/O voltage. The core voltage is usually lower than the I/O voltage. Guidelines for determining how to power up two or more voltage rails depend on the part and the manufacturer you use. The first implementation in ...
    .. you use. The first implementation in Figure 1 shows how to realize ratiometric sequencing, which means that both power-supply output rails simultaneously start and simultaneously reach their final regulated output voltage. This ...
    Oct 6, 2025

82. Circuit safely applies power to ICs
    Circuits Supply Texas Instruments LM3722
    .. circuits normally monitor a microprocessor's supply voltage, asserting reset to the IC during power-up, power-down, and brownout. In this way, the circuit ensures that the supply voltage is stable before the ...
    Nov 13, 2020
83. 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
84. 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
85. 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
86. 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
87. 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
88. 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
89. 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
90. 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

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