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.
247
questions
4
votes
2
answers
114
views
Electric moped PWM power diode failure
I'm back with my shoddy moped PWM project :)
Here is a link to my previous question which is directly related to what this question will be about: Electric moped PWM MOSFETs failure
Quick recap:
I ...
- 183
0
votes
1
answer
96
views
Do you see anything wrong with the power section in my schematic?
I am new to electrical engineering and I would be very grateful if someone could look over my schematic and tell me if something is wrong or could be done better. In my schematic I have a XT60-M ...
- 121
0
votes
2
answers
119
views
Identify single diode top marking A2, SOT23 (SOT23-3) package
I need to identify a diode (it may be a Schottky) single channel with top marking A2 in SOT23 (SOT23-3) package.
0
votes
0
answers
59
views
Easy Overvoltage and Reverse polarity protection circuit
I'm looking for the simplest and most effective way to add an overvoltage and reverse polarity protection network to a signal line connected to an MCU, the maximum allowable voltage at the MCU pin is ...
- 15
-1
votes
2
answers
48
views
Does the three-pin diode have a half current? [closed]
I need a 30 amp diode for the battery backup. I have used an MBRF30100CT diode. But I don't know the diode current is 30 amps or half of it is 15 amps.
- 21
1
vote
3
answers
160
views
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 ...
- 71
4
votes
4
answers
897
views
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 ...
- 149
0
votes
2
answers
113
views
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 ...
- 26
0
votes
2
answers
254
views
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 ...
- 13
0
votes
3
answers
208
views
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 ...
2
votes
0
answers
226
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.
...
- 21
1
vote
1
answer
125
views
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 ...
- 197
2
votes
1
answer
68
views
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 ...
- 23
1
vote
1
answer
107
views
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" ...
- 13
2
votes
1
answer
272
views
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 ...
0
votes
1
answer
47
views
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, ...
- 1
0
votes
2
answers
130
views
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 ...
- 445
0
votes
2
answers
50
views
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 ...
- 11
0
votes
1
answer
59
views
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?
- 1,061
0
votes
1
answer
33
views
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 ...
- 587
0
votes
1
answer
126
views
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?
0
votes
1
answer
612
views
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 ...
- 599
0
votes
1
answer
82
views
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. ...
0
votes
2
answers
258
views
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 ...
- 221
0
votes
1
answer
76
views
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 ...
- 1
0
votes
0
answers
134
views
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 ...
- 49
8
votes
2
answers
2k
views
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 ...
- 12.1k
5
votes
1
answer
524
views
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\$ ...
6
votes
3
answers
572
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 ...
- 75
2
votes
4
answers
301
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 ...
- 183
2
votes
1
answer
572
views
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 ...
- 420
2
votes
2
answers
376
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 ...
- 561
2
votes
1
answer
126
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 ...
- 21
0
votes
0
answers
69
views
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 ...
- 940
1
vote
1
answer
145
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?
0
votes
1
answer
112
views
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 \$...
- 548
0
votes
0
answers
32
views
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 ...
- 91
0
votes
3
answers
190
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 ...
1
vote
1
answer
360
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 ...
0
votes
2
answers
171
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 ...
0
votes
1
answer
413
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 ...
- 341
0
votes
0
answers
163
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 ...
2
votes
1
answer
598
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 ...
- 77
3
votes
1
answer
3k
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 ...
- 783
0
votes
1
answer
197
views
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 ...
- 40
0
votes
0
answers
90
views
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. ...
- 149
0
votes
0
answers
346
views
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 ...
- 327
0
votes
1
answer
227
views
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 ...
- 1
1
vote
0
answers
390
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 ...
- 535
0
votes
1
answer
240
views
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 ...
- 71