Схемы - Питание - 5

P Seshanna

Many applications require a sinusoidal reference voltage synchronized to the ac line voltage. You cannot derive such a reference voltage directly from the ac line because the waveform of the ac line is distorted because of nonlinear loads connected ...

Nick Cornford

Laser diodes can destroy themselves in a few nanoseconds, so testing the response and stability of a feedback-stabilized laser-diode driver can be expensive. The simulator circuit in Figure 1 shows a typical laser-diode package, which contains not ...

Stephen Woodward

Self-powered isolation amplifiers, which need no external isolated power supply, provide versatile and convenient interfaces in many applications that require galvanic isolation of the signal source. Examples of such applications include circuits ...

Carlisle Dolland

The circuit in Figure 1 is a quasi-linear regulator. It functions as a source follower for input voltages greater than a preset level, determined by VR 3 . For input voltages lower than the preset level, the pass element, Q 2 , operates as a ...

Stephen Woodward

When parts have been around as long, and in such widespread use, as the venerable LM317 and LM337 (and their siblings), you tend to think every trick that can be played with them is already in the (data)book. So, when the question arose whether ...

Anthony Smith

Whether you use them as indicators or to provide illumination, LEDs are hard to beat in efficiency, reliability, and cost. White LEDs are rapidly gaining popularity as sources of illumination, as in LCD backlights, but with forward voltages ...

Israel Schleicher

The circuit in Figure 1 is similar in principle to that of a previous Design Idea ( Reference 1 ) but offers improved, more reproducible performance. The output current is almost constant over an input-voltage range of 1.2 to 1.5 V and is ...

Roger Griswold

LED drivers have lots of features and require plenty of external components. When your application requires no PWM (pulse-width-modulated) dimming or controlled frequency operation, your primary concern may be that too much current could damage or ...

David Kim

The schematic in Figure 1 shows a way to increase the power available from a current-limited 5 V supply by adding power from a 5 V supply. The dc/dc converter generates a single 12 V, 150-mA (1.8 W) output from two regulated and current-limited ...