Circuits & Schematics: power supply - 9

81. 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

82. 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

83. 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
84. 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
85. 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
86. 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
87. Active Rectifier Controller with Ultrafast Transient Response and Low Power Dissipation
    Circuits Supply Analog Devices LT8650S LT8672
    .. is an active rectifier controller that (along with a MOSFET) provides reverse current protection and rectification for power supplies in automotive environments. This job is traditionally taken on by a Schottky diode, over which the ...
    .. power dissipation Small, predictable, regulated 20 mV voltage drop The LT8672 also includes a number of features to satisfy supply rail requirements in automotive environments: Reverse input protection to 40 V Wide input operation range: 3 ...
    Jun 14, 2018
88. 0.05 µV/°C chopped amplifier requires only 5 µA supply current
    Jim Williams
    Circuits Amplifiers Analog Devices LT1495 LTC1440
    .. operation and A1’s bandwidth dictate the 5 Hz clock rate. As such, the resultant overall bandwidth is low. Full-power bandwidth is 0.05 Hz with a slew rate of about 1 V/s. Clock-related noise, about 5 µV, can be reduced by ...
    .. 1 shows a chopped amplifier that requires only 5.5 µA supply current. Offset Voltage is 5 µV, with 0.05 µV/ C drift. A gain exceeding 10 8 affords high ...
    Dec 15, 2023
89. TOP242 power source for 10W LEDs
    Circuits Analogue Design Supply Light
    .. 500mA transformer Here are the electrical schematic: Click for inlarge Electronic schematic with the current limited TOP242 power source included And the printed circuit board schematic: Redesigned vinyl sticker PCB schematic for current ...
    .. two comparators with open collector which means it requires a polarization resistance towards the positive terminal supply (R9). If any of the outputs 1 or 7 of LM393 has the ground voltage then the voltage from the power ...
    Dec 19, 2012
90. Crystal-oscillator circuit is ultralow power
    Circuits Oscillators
    .. with about 10 pF of shunt capacitance; operating current into more capacitive loads will be higher. Table 1 breaks down the power consumption piece by piece. Capacitive loads must be charged by the upper transistor in the active output stage ...
    .. current for this comparator is 580 nA; the entire circuit shown in Figure 1 draws only 5 µA when running from a 3.3V supply. Figure 1. Traditional gate-oscillator circuits can draw several milliamps; the circuit shown normally draws ...
    Apr 11, 2013

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