Circuits & Schematics: power supply - 5

41. Three discretes suffice to interface PWM to switching regulators
    Stephen Woodward
    Circuits Supply Microcontrollers Usage Texas Instruments TPS54332
    .. rating isn’t much of an issue. A cool feature of this simple topology is that, unlike many other schemes for digital power supply control, only the regulator’s internal voltage reference matters to regulation accuracy. Precision ...
    Mar 7, 2025

42. 1 A, 20V PWM DAC current source with tracking preregulator
    Stephen Woodward
    Circuits Supply Microchip MIC2253
    .. time proven Bob Pease masterpiece! However, unlike the earlier design idea that requires a floating, fixed output 24-VDC power adapter, this sequel incorporates a ground-referred boost preregulator that can run from a 5-V regulated or ...
    .. adapter, this sequel incorporates a ground-referred boost preregulator that can run from a 5-V regulated or unregulated supply rail. The previous linear design has limited power efficiency that actually drops below single-digit ...
    Mar 4, 2025

43. Design an RTD interface with a spreadsheet
    Robert S. Villanucci
    Circuits Analogue Design Measurement Analog Devices AD633 OP177
    .. a constant current of 400 µA through the grounded sensor, T 1 . Driving T 1 with this level of current “zero-power” operation keeps the worst-case power that the circuit dissipates in the sensor to less than 40 µW ...
    .. The combination of C 1 and R 5 implements a lowpass filter with a pole at approximately 10 Hz to remove power-supply noise. The following term describes the performance of IC 2 and its accompanying circuitry: V T = 75V S 3 V. ...
    Feb 25, 2025
44. Tracking preregulator boosts efficiency of PWM power DAC
    Stephen Woodward
    Circuits Supply Fairchild LM317 2N3906
    .. design idea revisits another: “PWM power DAC incorporates an LM317” ( Ref. 1 ). Like the earlier circuit, this one implements a power DAC by ...
    Feb 17, 2025
45. 1-A, 20-V, PWM-controlled current source
    Stephen Woodward
    Circuits Supply ON Semiconductor LM337
    .. design idea (DI) takes an unusual path to a power-handling DAC by merging an upside-down LM337 regulator with a simple (just one generic chip) PWM circuit to ...
    Feb 7, 2025
46. Flip ON flop OFF
    Stephen Woodward
    Circuits Digital Texas Instruments CD4013B
    .. dependent, ranging from 500 Ω at 5 V to 200 Ω at 15 V. If the current demand of the connected load is low enough, then power can be taken directly from F1b pin 13 and the Q1 MOSFET is unnecessary. Otherwise, it is, and a suitably ...
    .. then pushed again. Thus, the promised push-ON/push-OFF functionality is delivered! The impedance of F1b’s pin 13 is supply-voltage dependent, ranging from 500 Ω at 5 V to 200 Ω at 15 V. If the current demand of the connected load is ...
    Feb 6, 2025
47. Practice safe dc/dc converter
    Eugene Kaplounovski
    Circuits Supply Texas Instruments LM2675
    .. protection is an obvious requirement for a power supply, especially when its load connects to a cable that's subject to damage. Many modern power-converter ...
    Jan 22, 2025
48. Motor-control scheme yields four positions with two outputs
    Jean-Bernard Guiot
    Circuits Power ON Semiconductor 1N4937 BDX33C BDX34C
    .. The transistors are preferably Darlington types and, like the diodes, should have adequate ratings to accommodate the power-supply voltage and the motor current. (Don't forget the high inductance of the motor.) The components in ...
    Jan 21, 2025
49. Transistor latch improves on/off circuitry
    Eugene Palatnik
    Circuits Supply Microcontrollers Usage
    .. 1 shows an example of on/off circuitry commonly used in battery-operated devices. The p-channel MOSFET, Q 1 , serves as a power switch. When you push the On button, S 1 , Q 1 ’s gate goes low. Q 1 turns on and supplies battery ...
    Jan 21, 2025
50. Power source is insensitive to load changes
    Ken Yang
    Circuits Supply Maxim MAX427 MAX4372H
    .. and thermoelectric coolers. Their resistance can change more than 100% during operation, and the result is a change in power dissipation for elements receiving drive from a fixed voltage or current source. Worse, excessive power can ...
    Jan 20, 2025

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