Questions tagged [schottky]

A Schottky diode typically has a lower forward voltage drop and faster switching speed than a standard silicon diode. Several forms of transistors also use the same Schottky barrier effect such as MESFET to increase switching speed while others include a Schottky diode as a form of clamping.

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1answer
335 views

Limiting small signals to one direction (ideally with passive components)

My setup is as following: I use a Y-Cable for splitting an audio signal to two devices (boxes and earphones). The headphones have quite big speakers so they act also like a microphone - feeding back ...
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3k views

How does reverse leakage current of a Schottky diode come into play with a SMPS?

Looking at diodes for a low power switch-mode power supply I'm designing. I'm not quite sure what the reverse leakage current value is, or if it's relevant in the component selection.
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290 views

Metal semiconductor contacts

I’m headed back to the CNF (http://www.cnf.cornell.edu/) shortly. It’s a user clean room facility for semiconductor processing. My goal is to make some very simple samples, for use in student teaching ...
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how many 74LS low-power Schottky inputs can an output of MC9S12DG128 drive?

I need to figure this out for a project and can't seem to find the answer. Does anyone know how I can figure this out? I think there is an equation to find this and can't seem to find the ...
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Capacitance - Voltage characteristic diagram in a Schottky diode

I 've searched the web for that diagram with no satisfactory result. Does a schottky diode has capacitance or not because of very tiny depletion (almost none) zone ?
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Schottky Diodes in parallel

I was looking at a reference design and I saw a symbol I didn't recognize: So I looked up the part. It's a dual Schottky rectifier like this: What is the purpose of having two diodes in parallel in ...
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1answer
279 views

Schottky power diode replacement

I'm trying to implement a 12V to 5V step down voltage regulator with a Texas Instruments LM22677, as suggested in the device datasheet (Pag 12, Fig 20). Regarding the selection of the power diode, TI ...
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1answer
483 views

ATtiny85 absolute ratings for outputs?

The ATtiny85 datasheet specifies an absolute maximum negative voltage for any pin of -0.5 volts relative to ground. Consider this partial schematic: MOSI and MISO are the respective ATtiny85 pins ...
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2answers
3k views

How does a Schottky diode work?

There are no spare positive/negative charge carriers on the metal side of the diode, so the spare positive/negative charge carriers on the semiconductor side can not diffuse into the metal and ...
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Schottky diode like BJT symbol

In this schematic, what do the Schottky diode like "barbs" mean on some of the BJTs where the base is connected? I haven't encountered this symbol before.
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1answer
136 views

Switching between external power and batteries with varying voltages

I want to supply some voltage regulators (12V, 5V and 3.3V) with one of two power sources: one wall power-supply and/or a LiPo-pack. The input voltage would be in the range of 10V-24V and a continous ...
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0answers
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Inductorless DC to DC step up converter

I'm trying to make a DC to DC boost converter without inductors. Actually, I don't know much about this kind of circuits. I did a research on the net and I found the circuit below. But the problem is ...
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1answer
1k views

Can a Zener diode be used in place of a Schottky?

I want to use a LM226677 Voltage reagulator to achieve a step-down converter from 12V to 10V. However, in a Schottky diode is used reversely polarized at the output of the LM22677, and the datasheet ...
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1answer
620 views

Diode small signal model and exponential model comparison

I'm working my way through the chapter on diodes in Sedra and Smith Fifth Edition Exercise 3.15 asks: Consider a diode with \$n=2\$ biased at \$1ma\$. Find the change in current as a result of ...
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119 views

Schottky Diodes Depletion Region

When there is diffusion of electrons to the metal from the n-type semiconductor, why does Wikipedia says there is no charge carrier depletion region at the junction in a Schottky Diode?
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266 views

How to know if a diode is Schottky or power Schottky?

I bought a diode for a circuit but the guy who sells components asked me if I want Schottky or power Schottky. I need to buy SB2040 but I cannot figure out what type it is.
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931 views

How to drop the voltage from 3.8V to 3.3V - LDO or Schottky diode?

What is the better way of dropping the voltage from 3.8V do 3.3V - using an LDO (e.g LP2985IM5-3.3) or the Schottky diode? It's about power supply for a microcontroller. I plan to use the ST1S10PHR ...
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776 views

Schottky diodes for voltage conversion

I recently bought a DE0 FPGA board with GPIO headers. The schematics shows that some of them are protected with BAT54S Schottky diodes. Does it mean that if I input 5v logic level they will be ...
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2answers
7k views

How should I connect multiple Lithium Polymer battery packs in parallel?

I have an application for which I need a relatively high amount of current @5V. I was thinking of connecting four external USB battery packs like these in parallel, as they output a nice regulated 5V ...
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1answer
170 views

Schotky diode in DC voltage setup

testing 1N5712 with a resistor of \$10k\Omega\$ connected to 15VDC and the diode's cathode connected to ground and anode to the other side of resistor. I get about \$1.5ma\$ through the diode instead ...
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1answer
2k views

Separating USB/MCU power buses

There are two power supply sources in the following diagram - USB and 12V. Only one power supply can be connected at the same time. I am trying to disable power to ...
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Schottky transistor, Not sure I understand it?

So I've been looking through and going through my Digital Computer Electronics book, and I came to this... It seems so simple and I understand the "point" of it, but I'm not sure I understand exactly ...
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Is a Schottky diode appropriate for reverse polarity protection?

To narrow the focus a bit from an earlier question: Is a Schottky diode appropriate for reverse polarity protection? I'd like to prevent mishaps from a user connecting DC power in reverse, but I'd ...
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1k views

What happens when I connect the GND of a LDO in a Diode to the real GND?

A friend of mine told me to put a diode between the LDO's GND pin and the circuit's GND. He said the LDO will regulate it's fixed voltage plus the diode drop. Is it true? How does it work? I am using ...
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423 views

High voltage H-bridge diode

i'm designing a varable-frequency drive with 2 H-bridges based on IR2108 half-bridge drivers. I want it to drive a 220v single-phase motor. Reading the datasheet i got a little confused on choosing ...
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For a lower voltage drop one could use Schottky diodes, but what are the disadvantages of Schottky's?

In other words, why don't we always use Schottky diodes if they are so much better? What diode properties do Schottky diodes have that makes them unfit for certain applications?
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238 views

Device is reset when switching power sources

I use a home weather station. It is powered by two AA batteries (2 x 1.5 = 3.0 V nominal). The problem is that it eats more than 1 mA and that is quite a lot of power and I must buy a new pair of AA ...
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Is there such a thing as a Schottky zener?

I was thinking about this when I was looking for over- and undershoot protection. If you use a zener you can clip the overshoot at a defined level (ignoring the slowness of the zener), but the ...
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3k views

How do I determine the Schottky diodes to use with my H-bridge?

I am trying to build my own H-bridge to drive a DC motor (12 volt, 25 amp stall). This is one of my first attempts ever at making my own circuit. I want to use the HIP4080A to control four N-channel ...
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2answers
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Can I use a 40V schottky on a system which may suffer a 40V reverse fault?

I've heard that the Vrrm of a diode is a maximum, and the diode should not be continuously exposed to it. I'm using a PMEG4010CEJ diode, a 40V/1A SOD323 diode. Basically, the power input is a 33.6V 8S ...