Questions tagged [schottky]

A Schottky diode is a diode formed by the junction of a semiconductor with a metal. A Schottky diode has a lower forward voltage drop and faster switching speed than a standard silicon diode.

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The effect of silicon diode vs Schottky diode as reverse voltage protection of a LED

I have a 24Vac, 50Hz source and RGB LED to be driven from it. As the LED reverse max is like 5V, I have to prevent the reverse half cycle of voltage from being applied across the LED. There are two ...
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Op-amp with Schottky diode

I'm struggling to understand what the sense is of using the two Schottky diodes in this excerpt of a circuit: I understand how a Schmitt trigger works. The diodes ensure that the voltage difference ...
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Why does a boost converter need 11 mA without a load?

I use a FP6296XR-G1 (U10 / 10A boost converter) together with a MBR20100CS (D5 / dual Schottky diode in a TO252-2 package) in order to make 13 V out of 2.5-5 V. When I connect BOOin to 5 V from an ...
RRIDDICC's user avatar
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Switch between two DC sources using Schottky diodes

I'm building a small power bank as a backup for my router due to frequent power outages. The router takes 12 V 1 A, even though, it can take between 10-15 V without an issue. I'll be using CC/CV ...
Ali's user avatar
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3 answers
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Eliminating Negative Voltage Pulses (≤ 840 mV)

I have obtained a voltage signal from a Weigand sensor (a sensor that creates a low voltage signal when placed in a rotating alternate magnetic field), which generates a positive pulse of 1.2 V and ...
Taimoor Malik's user avatar
2 votes
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122 views

ESP32 with two power supplies (AC/DC + USB) using Schottky diodes

I'm building a small circuit to power an ESP32 with two different power supplies. Normally the circuit will be powered from AC, using a Mean Well IRM-02-5 AC-DC power supply to get 5VDC out of 220VAC. ...
Daniel P.'s user avatar
1 vote
1 answer
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Non-Schottky SiC diodes

Hopefully this isn't too much of a shopping question. I am looking for off-the-shelf silicon carbide P-N junction diodes, but all I can find are Schottky ones. Do P-N version ones even exist ...
user1402154's user avatar
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High voltage at the Schottky's anode terminal (Hobby Li-Po charger circuit)

I'm pretty new at hardware side of things and trying to teach myself circuit and PCB design just as a hobby, so. bear with me if I'm annoyingly noob for you. As a relatively simple first task, I ...
reo's user avatar
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1 answer
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What is this 2-pin motherboard component and is it broken?

I own a ASUS FX505DT Notebook and the fans stopped spinning so I wanted to check the voltage with a multimeter. I accidentally slipped of one of the terminals and released some "magic smoke" ...
Marvin's user avatar
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Are there any Schottky-diodes that can replace the ones on this PCB?

I want help with finding Schottky-diodes to replace the ones on the PCB bordered in the red rectangle. They are probably non-working as they failed the continuity test with a multimeter. I have two ...
Max Frambuesa's user avatar
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FDMS7658AS SyncFET replacement for a regular one, burned it

I have a 3rd-party circuit (dimming 5V bulbs), which suddenly stopped working. The FSMS7658AS mosfet was dead. Here is the datasheet » The key parameters are: N-Channel PowerTrench® SyncFET™; 30 V, ...
sTE's user avatar
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2 answers
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CRS01(TE85L,Q,M) Schottky diode is open both ways

I was testing my PCB when I noticed that I get +12 V on USB Vbus line, even though I placed a Schottky diode to block it. The idea is to use +12 V voltage source to provide power and to connect USB ...
Dominykas's user avatar
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Why is the Voltage after Inductor discharging, the Voltage 24V?

As seen in the schematic, V2 (SUM75N06-09L) is switched off and then L1 is discharging through D1 and D2. After discharging the voltage at node vn003 (marked in schematic) is at 24V. Can anyone please ...
user349644's user avatar
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Reverse breakdown voltage over series elements

The M2* FETs are 100 V graded while D_pass is 150 V. Will the FETs' body diodes help them survive a negative 150 V spike?
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5 V behaviour of Mikroe Feather click shield when powered from Feather only

The Mikroe Feather click shield supports a mode where the power comes from the Feather: In this mode the Feather board will provide 5 V and 3.3 V labeled as P5V ...
Francois's user avatar
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What is the SMD component (MRY marking)?

I could not find the part number for this component (right arrows). The component on the left is a Schottky diode, right?
Harty Guyton's user avatar
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Reverse recovery diode power loss in switching MOSFET

For designing a low side non-sync buck regulator I am looking for MOSFET(s) that can provide low overall power loss. Conditions would be 60V to 48V, 10A, 600 kHz (worst case), 1 Ohm source and 0.35 ...
EarthLord's user avatar
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4-20 mA to voltage converter: What is the significance of the 12 V power supply to Schottky diode D2 and D3

Please check this PDF https://www.electronicsworld.co.uk/wp-content/uploads/2019/04/2019ewApr-1.pdf. I really can't understand the need for 12 V supply connected with reverse bias to D2 and D3. ...
user20033862's user avatar
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Reverse voltage protection of boost converter with Schottky diode shows small voltage output

I am testing reverse voltage protection using Schottky diode and found small but not trivial level of voltage leakage when combined with boost module in open circuit. Here, as you can see, the 12 V is ...
slyx's user avatar
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Are the full bridge rectifier on a IGBT pack switching, fast or Schottky diodes? [closed]

In a skiip24nab126 IGBT pack for motor VVF drives: are the 3 phase full bridge rectifier diodes fast Schottky or switching or just normal / common diodes like 1N4007? Does the rectifier need to switch ...
DiegoJR's user avatar
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Can a Schottky diode be used for RF signal switching using its low junction capacitance at high reverse bias?

For a project, I want to use an RF switch that can switch a 40 MHz RF signal (1-2 kW) with a peak-to-peak amplitude in the 1000-2000 V range. The switching frequency is in the 100kHz-200kHz range. The ...
Allison's user avatar
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8 votes
2 answers
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What does the statement "Schottky diode has high switching speed" mean?

I understand that digital circuits that can be run at high frequency can be called "high speed," but what is the meaning of "Schottky diode having a high switching speed?" Does ...
quantum231's user avatar
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Two parallel Schottky diodes vs diode arrays

I'm looking to replace this Schottky diode array 6CWQ10FN in a buck converter design. There aren't many diode arrays available. Are there any drawbacks of paralleling to normal Schottky diodes instead ...
Voltage Spike's user avatar
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Protecting a Schottky diode against negative spikes greater than its specified V_rrm

It appears this can be made to work, but I am not sure how. Related: Protection against transient voltage spikes regarding ISO7637-1/2: TVS diode with Schottky diode suitable? or a 40V schottky plus ...
kellogs's user avatar
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5 votes
1 answer
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Is reverse breakdown destructive for diodes?

Take a PN or Schottky diode and apply a reverse bias voltage. Go beyond the absolute maximum reverse voltage (given by the datasheet) and limit the current to a low value, such that \$P = V\cdot I\$ ...
Alessio Caligiuri's user avatar
6 votes
3 answers
494 views

Does the capacitance of a Schottky diode depend on switching frequency?

In datasheets they write '1 MHz' in the capacitance vs voltage figures. For example: I suppose it is some sort of a standard to measure the capacitance at 1 MHz, but is there a dependence of the ...
Tyo Hoy's user avatar
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2 votes
4 answers
238 views

Why does a "better" Schottky diode result in inferior AC-DC converter performance?

I have an AC-DC converter that outputs 6 A current at 12 V output. It's based on the CR6850 PWM controller. The schematic diagram is attached. I need to increase the output current to 10 A. The high ...
Isso's user avatar
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How many amperes to choose for a Schottky diode after a current limiting power supply?

I have a power supply (original Raspberry Pi power supply, datasheet) with 5.1 V which delivers up to 3 A. In case of a short-circuit or if more than ~ 3.4 A is drawn, the power supply will change to ...
Tintenfisch's user avatar
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2 answers
326 views

Protection against transient voltage spikes regarding ISO7637-1/2: TVS diode with Schottky diode suitable?

I have a question regarding transient voltage spikes based on ISO 7637-1/2. For positive voltage impulses, you would want to use unipolar TVS diodes in reverse mode to clamp the voltage to the TVS ...
Dakalaom's user avatar
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2 votes
1 answer
113 views

Switching between USB and battery not fast enough

I am trying to design a power supply for portable device and stumbled upon a problem that is probably trivial, but it's a tough one for me (having no formal electrical education). The device is ...
zdenek's user avatar
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Reading voltage on flyback diode's anode

So I have this motor driver that I've already asked a couple dozen questions about that I have finally got around to building. Here's the final schematic that I'm using: It uses only N channel ...
php_nub_qq's user avatar
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1 answer
140 views

We fabricate P-type and N-type Schottky diodes and a P-type Schottky diode; can a PN-junction diode and PNP BJT be formed?

A Schottky diode is a unipolar device. If a P-type Schottky diode is fabricated on an N-type Schottky diode, can we make a PN-junction diode and a PNP transistor?
Chandra Prakash's user avatar
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1 answer
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Resonant frequency of a tuning circuit with varactors

This is the circuit that I'm simulating in LTSpice: I measured the experimental resonant frequency of the circuit by finding the frequency at which \$V_\text{out}\$ peaks for different values of \$...
kene02's user avatar
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0 answers
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Parallel ground settings for enable/disable of DC converters

Maybe this is not even that complex but I'm not finding any practical solution right now. I'm using 6 Murata DC/DC converters (labelled with CH1 to CH6). I want to use the enabling pin of those ...
Janik's user avatar
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3 answers
176 views

Schottky TTL current calculator [closed]

I have a problem from university where I have to calculate the I ccl. I am a little bit confused because I don't know how to do it. The problem says as well that Schottky TTL state is 0 logic (I think ...
Florin Sebastian's user avatar
1 vote
1 answer
227 views

SS34 in-line Schottky alternative

Is there an inline alternative to this part I can replace it with? With my limited electronics knowledge and the ability to google I know this is a surface mount diode rectifier but that’s about as ...
Daniel Sinclair's user avatar
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2 answers
144 views

Designing a flyback converter for 12V Input to 120V Output with LT Spice. Are these reverse voltage spikes normal

With this setup, I'm getting some periodic voltage spikes on the primary and secondary inductor (secondary spikes to around 2.7kV). The output shows the constant ~120V I want. Are those voltage spikes ...
P4r4Lys3d's user avatar
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1 answer
306 views

Schottky diode: voltage on anode side

I was trying to power my Raspberry Pi Pico through a Schottky diode CUS10S30 according to this schematic: The weird thing is that when Pico is powered via USB and nothing is coming from an external ...
Leonti's user avatar
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0 answers
146 views

How to wire multiple 9 V batteries together in parallel using Schottky diodes?

I need help figuring out what kind of Schottky diode to use to make sure my batteries don't blow up. They are 9 V batteries. I want to wire like 9 of them together to make a long-lasting battery. Is ...
DiYguy120's user avatar
2 votes
1 answer
445 views

How to design an auxiliary power hot swap controller?

I'm designing a system that has to sit out in a field for days with no access to power mains. It contains a computer, low speed motors and a few sensors. Power info is 29V nominal input (8S Lipo), 15A ...
ardoknow's user avatar
3 votes
1 answer
2k views

Are blocking diodes really needed for solar panels in parallel?

If one connects two technically identical solar panels in parallel (to increase current), many sources suggest to put each of the panels in series with a Schottky diode before joining these branches ...
oliver's user avatar
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1 answer
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How is the PASCO microwave receiver realized?

I took a physical lab course where I worked on the microwave PASCO set-up WA-9316. Having a little background on electronics, I wondered how their microwave receiver works and found a more or less ...
simonstar's user avatar
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0 answers
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Substituting components (schotky diode, MOSFET) in my circuit

I have the following battery protection circuit (mostly it's just a copy of MAX17320 reference design provided by Maxim). It's meant for a 2 cell li-ion battery pack designed to power a small robot. ...
roli's user avatar
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0 answers
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Simple short, overvoltage and reverse polarity protection

I am looking for a simple way to protect the 3.3 V power supply to which the MCU and other peripherals are connected. The protection is supposed to be against short circuit, overvoltage and reverse ...
Piotr's user avatar
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1 answer
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Ideas for protecting the input of an opto against high reverse voltage

I've been given a circuit to test and pointed out that the potential reverse voltage across the led in the opto will exceed the spec. The cct is a dual input with an opto on each channel, which feed ...
mikey_jp's user avatar
1 vote
0 answers
347 views

What is a field effect rectifier diode

ST offers what they call field-effect rectifier diodes. Does anybody know what that actually is and how they work? Application wise it seems very similar to a Schottky diode (low voltage drop,) but ...
Lucas's user avatar
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Why does the Schottky barrier height remain constant?

If a metal and a semiconductor are connected, they are going to equilibrium. For this, the Fermi level has to be equal. So far I understood that this causes a charge exchange till said equilibrium has ...
Tobias's user avatar
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1 vote
1 answer
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Why are regular diodes designed with ideality factors \$n\gg 1\$

(The question is at the end of the text.) In have a recurring application, where I want to clamp ESD strikes into a sensitive high-impedance into a guard node using antiparallel diodes. simulate this ...
tobalt's user avatar
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14 votes
3 answers
3k views

Why is there a Schottky diode connected to the low-side switch

I am trying to understand the reason for having a Schottky diode for protection in a buck switch by reading here. To summarize, I can understand why two the switches should not be turned on at the ...
chami's user avatar
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0 votes
1 answer
385 views

How to arrange input protection components?

I want to protect the input of my 5V micro-controller from two types of disasters, I am detecting a low on the input (0V): The input is from a switch. When the switch is on it provides a ground. Over-...
JoeyB's user avatar
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