Circuits & Schematics ON Semiconductor - 4

31. Add gain to an absolute-value amplifier
    Chuck Wojslaw
    Circuits Measurement Amplifiers ON Semiconductor CAT5113
    The absolute-value amplifier is a basic building block in test-and-measurement and signal-processing applications. The addition of a DPP (digitally programmable potentiometer) adds another dimension, G (gain), to this key circuit. Because the gain ...
    Apr 13, 2021
32. Switch debouncer uses only one gate
    Circuits Digital ON Semiconductor NC7SZ04
    The circuit in Figure 1 produces a single debounced pulse each time you press S 1 . Moreover, the circuit uses only logic power from the remote pull-up resistor, R 2 . You can use the circuit to detect when a key is pressed in a nonenergized ...
    Mar 9, 2021

33. Get just enough boost voltage
    Circuits Supply ON Semiconductor CS5171
    Adding a current-mirror circuit to a typical boost circuit allows you to select the amount of boost voltage and to ensure a constant difference between the input and the output voltages (Figure 1). This circuit is useful for high-side-drive ...
    Feb 10, 2021
34. Where is the wiper?
    Chuck Wojslaw
    Circuits Digital ON Semiconductor CAT5113 CAT5114
    You enjoy significant advantages when using DPPs (digitally programmable potentiometers) with increment/decrement serial interfaces. Programming the serial interface is simple and fast, and you can adjust the potentiometer in real-time ...
    Jan 20, 2021
35. DPPs make nonvolatile microvolt DAC
    Stephen Woodward
    Circuits Measurement ON Semiconductor CAT5113
    The availability of a seemingly limitless variety of monolithic DAC chips makes it easy to implement most digital-to-analog-conversion applications with a single off-the-shelf device. Sometimes, an unusual set of requirements necessitates a ...
    Dec 21, 2020
36. P-channel power-MOSFET driver uses unity-gain op amp
    Circuits Analogue Design Power ON Semiconductor MC33072 PN200A BD135G BD136G
    P-channel MOSFETs can simplify designs when you use them as high-side switches on circuits with voltages exceeding 100 V dc. When driving a MOSFET, you must rapidly charge and discharge the input capacitance between its gate and its source to ...
    Nov 10, 2020
37. Enhanced Circuit Yields Versatile, Efficient Switch-Mode Solenoid/Relay Driver
    Stephen Woodward
    Circuits Power ON Semiconductor LM339
    In this Idea for Design, using a comparator-based switch-mode driver circuit of a solenoid improves efficiency by tailoring the drive to the pull-in versus hold-mode current requirements. Several years ago, Paul Rako, in collaboration with the ...
    Oct 25, 2020
38. Power-supply interrupter fights ESD-induced device latch-up
    Circuits Analogue Design Supply ON Semiconductor MOC211M BSS138
    EDN Under certain conditions, ESD events can damage digital circuits by causing latch-up. For example, when ESD triggers them, parasitic transistors normally formed as parts of a CMOS device can behave as an SCR (silicon-controlled rectifier). Once ...
    Oct 12, 2020
39. Test continuity with an LED
    Raju Baddi
    Circuits Measurement ON Semiconductor BC549
    You sometimes need to know whether a resistance exceeds a preset limit. The continuity tester in Figure 1 lets you determine that fact for resistances of 0.5 Ω to 10 kΩ. The heart of the circuit is the transistor pair comprising Q 1 and ...
    Jul 21, 2020
40. Low-dropout linear regulators double as voltage-supervisor circuits
    Circuits Supply ON Semiconductor NCP500
    William Lepkowski EDN Many low-dropout voltage regulators include an enable-input pin that can also serve as an inexpensive alternative to a voltage-supervisor IC. Although the enable pin normally serves as a means of shutting down the ...
    Jun 12, 2020

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