Circuits & Schematics ON Semiconductor - 2

11. PWM controller drives LEDs from high-voltage lines
    Christophe Basso
    Circuits Supply ON Semiconductor NCP1200
    Powering LEDs from a wide dc range say, 30 to 380 V without wasting a lot of power in the regulating block, is a difficult task when the LED current needs to be constant. Dedicated LED drivers are available, but they usually implement boost ...
    Nov 7, 2023
12. Single switch controls digital potentiometer
    Jim Bach
    Circuits Interfaces Digital ON Semiconductor CAT5114
    This Design Idea is an evolution and simplification of another (Figure 1, Reference 1 ). Replacing the three inverted-input NOR gates with their logical equivalents, positive-input NAND gates, makes these three gate symbols consistent with the ...
    Oct 10, 2023

13. Input-protection scheme tops other approaches
    Kannan Natarajan
    Circuits Analogue Design Interfaces ON Semiconductor 1N4935
    You typically accomplish overvoltage or surge protection at circuit inputs by connecting diodes to the supply rails, connecting zener diodes to ground, or connecting transzorbs to ground. Unfortunately, for high-energy surges at the inputs, ...
    Jul 26, 2023
14. Complementary-pair dc/dc converter simultaneously doubles, inverts supply voltage
    Ajoy Raman
    Circuits Supply ON Semiconductor BCP56 MBRS1100
    The circuit in this Design Idea uses an intrinsic property of collector voltages in one-transformer pushpull dc/dc converters: They have a swing of twice the supply voltage. When you implement these circuits with an NPN device, the collector swings ...
    Jun 29, 2023
15. Open-collector output provides fail-safe operation
    Susanne Nell
    Circuits Supply ON Semiconductor BD139
    It is common practice to use digital open-collector outputs for control units in industrial applications. Using these outputs, you can switch loads, such as relays, lamps, solenoids, and heaters. One possible problem inherent to this type of output ...
    Jan 12, 2023
16. Transistors tame perfidious leakage inductance
    Christophe Basso
    Circuits Supply ON Semiconductor NCP1200 MTP3N60E
    In flyback converters that use primary regulation, the loose coupling between the power secondary and the primary auxiliary windings often results in poor cross-regulation. This situation arises mainly from the leakage inductance but also comes ...
    Sep 29, 2022
17. Active Emulator Supports Multiple RTD Wiring, Sense Configurations
    Vardan Antonyan
    Circuits Measurement ON Semiconductor BSS138
    Before running a formal test with multiple resistance temperature detector (RTD) sensors, it is often necessary to calibrate and debug a data-acquisition system to verify basic functionality. The brute-force approach would be to wire all the ...
    Sep 8, 2022
18. One Oscillator Drives Multiple Solid-State Relays
    Juan Ramon
    Circuits Power ON Semiconductor IRF530
    Thanks to a combination of low initial cost and low on-resistance, a conventional electromechanical relay often makes sense for switching large amounts of load current on and off and when proportional control of the load's current or voltage is ...
    Sep 6, 2022
19. Simple Super Ripple-Eater Also Cleans Battery-Based Supply
    Bill Morong
    Circuits Audio Supply ON Semiconductor 2N5087 2N5089
    Many amplifiers, including integrated devices, are afflicted with undesired, implicit input terminals in their power connections. Due to less than perfect power-supply rejection, these implicit terminals admit noise into the signal that the ...
    Jun 14, 2022
20. Automatic Latch-Off Circuit Saves Batteries
    Kieran O'malley
    Circuits Automation Supply ON Semiconductor NCP1421 MBT3946DW1
    Although rechargeable batteries offer many advantages, they can suffer damage and shortened service lives if they're fully drained of their charge. The circuit in Figure 1 shuts off a battery-powered appliance in this instance, an LED ...
    May 30, 2022

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