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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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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Scaling battery voltage to 3.3V ADC input

I came across a circuit similar to that depicted below which scales a battery voltage which can range from 11-22Vdc to 0-3.3Vdc for a MCU ADC input. In the circuit I came across, the diode used is a ...
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11 votes
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Understanding a tachometer signal conditioning circuit I inherited

I have inherited a tachometer signal conditioning circuit. It has an NPN transistor (2N3904) with a Schottky diode (BAT54) between the emitter and the base. It is preceded in the circuit by an LT1017 ...
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Schottky barrier at equilibrium

At equilibrium, the barrier for electrons to go from metal to semiconductor is higher than the barrier for electrons to go from semiconductor to metal. Shouldn't that mean there are more electrons ...
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P-type Schottky diode forward bias direction

For n-type Schottky diodes, when we apply forward bias (positive voltage on metal side), electrons start flowing from semiconductor to metal. Similarly for p-type Schottky diodes, holes start flowing ...
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Electric field of Schottky diode

Reference: Device Electronics for Integrated Circuits 3rd Ed. Richard Muller I am trying to understand how to calculate the maximum electric field. The answer given in the book is $$E_{max} = \frac{-q ...
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3 votes
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Schottky diode I-V understanding & combining info from graphs

I'm looking for schottky diodes to make 2 power rails (powering from charger vs powering from battery) meet together while minimizing voltage drop. Currents are expected to be up to 2-2.2A peak for ...
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TP4056 power sharing circuit Rpull

I am replicating the TP4056 charging circuit on https://www.best-microcontroller-projects.com/tp4056-page2.html and solving the power-sharing problem. The website mentions a Rpull resistor that pulls ...
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Repetitive Peak Reverse Current of Diode

I am trying to select an appropriate diode for the gate circuit of a power MOSFET. I am considering the STMicro STPS140Z Schottky diode for this application; however as I am reading the datasheet ...
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Using a series diode to protect input with pull-up resistor

I have a switch input that I need to protect from miswiring to 12V battery power, reverse wiring to power, ESD and transients. I tried using a Zener diode circuit to handle the overvoltage: Steering ...
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Can a Schottky diode act as a short under high frequency due to its capacitance at the PN junction?

I read online how a Schottky diode has a capacitance usually in the tens of picofarads. I was wondering, under maybe high frequencies this could act as a short due to the general nature of a ...
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2 votes
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How do I prevent all valves to activate when a single curcuit activates?

I'm setting up a watering system in my greenhouse. This is a 12v DC system. I have three timers, each controling its own solenoid valve + a shared water pump. How do I prevent current from going to ...
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What are the different diodes for an H-bridge?

I am designing an H-bridge and I am wondering about the diodes I should use in my circuit. The first one is the one at the input of the MOSFET driver supply, I guess it must be a schottky that can ...
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BATxxx, BAVxxx, BASxxx, the meaning of first three letters in various diode names

As known, there are various diodes named BATxxx, BAVxxx, BASxxx. Then what's the meaning of 'BAT', 'BAV', 'BAS'? Thanks.
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Regulator input overvoltage protection

I am using a 2A Buck regulator from TI (https://www.ti.com/lit/ds/symlink/tps562202s.pdf?ts=1622136131438&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTPS562202S), with max input voltage ...
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Schottky+Capacitor as flyback (snubber) diode

Since de-charged caps momentary act as short circuits, why not use schottky+capacitor (in series), as flywheel solution? don't they (at least theoretically) store fast energy transitions happening ...
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Can I use "ideal diode" in series in solar cells?

i have a small experimental solar panel system to gain knowledge before moving on large power systems. My system is 5 solar cells in series, each 5.8V 0,52A (peak power). So total is 29V 0,52A (about ...
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How to drive a high side MOSFET with an optocoupler correctly?

I am trying to create an absolutely minimal motor driver, to create a <5$ low power odrive. But since I am only a software developer, I do not have a 100% understanding of analog components, and ...
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Selecting proper bypass diodes for solar panel

On my sailing boat we've installed four solar panels (two times Vmp = 17.64V, Voc = 21.6V, Imp = 5.67A, Ioc = 6.07A, Pmax = 100W and two times the same but 75W), which we connect all in parallel, then ...
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How to modify a buck converter for higher current output?

I have a 17V DC power supply which can provide around 50A. I want to build a battery charger using it which outputs 14.6V constant voltage. Therefore, I'm planning to manipulate low cost, widely ...
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Schottky diode leakage / PowerPath sharing

I've got a pretty simple circuit here where main regulator is powered either from battery or from USB source. When USB power is conected Q2 is closed and battery is charged by MCP73831 at the same ...
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How do I create a secure clamping circuit?

Clamping is good for transients, e.g voltage peaks. But two issues with clamping is that if you have a linear voltage regulator attached to 3.3v and 3.3v is the voltage regulator output, then that ...
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Why is it required to put an external inductor and diode at the output of a step-down switching voltage regulator?

I'm using a LM2576 switching voltage regulator and I see that an inductor and a Schottky diode are required at the output. The schematics is below: I understand why the capacitors are there, but why ...
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How will an ultra-low leakage Schottky diode affect resistor selection when designing a load-sharing circuit?

Could you believe it? Affordable charger circuits on the market still don’t come with load sharing components built in these day and age. So I had to build my own. I’m somewhat new to this so bear ...
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8 votes
1 answer
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How is the asymmetry of a Schottky diode obtained?

A Schottky diode is constructed with two metal conductors bonded to a doped semiconductor. One of the metal-semiconductor junctions is a Schottky contact, and the other metal-semiconductor junction is ...
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5 votes
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Which Shottky diode do I need for redundant power to a Raspberry Pi Pico

I'm working on a project which involves setting the clock on a Pi Pico over USB and then seamlessly switching over to battery power when the USB connection is removed. How to accomplish this is ...
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Schottky diode polarity attiny85 dev board

This dev board, forgive my second question on it today. My question is regarding the Schottky diode. It looks to me like the USB 5V is wired to the cathode. Wouldn't that mean it would only allow ...
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How much current Hold and WP SPI Flash pins can draw?

In my design J14 is used as header to which I connect wires to an external programmer (DediProg) in order to program an SPI Flash (U25). At the time of flashing, I don't want to supply voltage to (...
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Role of the Schottky diode (power supplies)

In the figure below I have two power supplies (+ VS, -VS) of 100V to power a PA107DP amplifier. The 2 power supplies must be supplied by an external voltage of 24V (the connector of the external power ...
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1 vote
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Correct schottky diode selection

So I'm using the LMR16006 DC/DC converter which is suggesting to place a Schottky diode from the SW pin to ground with a voltage rating 25% higher than my input voltage, which is 50V. Hence, the ...
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Schottky diode not behaving as expected

I have a nominal 5 V rated Schottky diode that I am bench testing in series with a resistance. In the reverse mode the diode successfully pulls down to the 0.1 - 0.2 V as expected, but in forward ...
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Generally, how do you describe the functions of the basic parts in a buck or boost converter? The parts are enumerated in the post [closed]

Here is a homework question I am answering. 1. Explain the function of the following parts in the DC-to-DC converter. a. MOSFET b. Schottky Diode c. Inductor d. Capacitor Here is an accurate basic ...
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Why specifically use a MOSFET and Schottky diode on a buck or boost converter and not other transistors or diodes?

My electronics professor is currently teaching DC-to-DC converters. He decided to drop us some theoretical homework and just postpone the experiment. He gave us some questions. This is one of those ...
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How to tell if my midi keyboard diode is a Schottky or rectifier diode?

I purchased a non-functional M-Audio 49 midi keyboard. The keyboard does not power on. It is powered via USB - it has no AC input to connect to a wall outlet. I checked the power circuit board and all ...
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Schottky diode for MOSFET H-bridge

how can I calculate the value of the schottky diode? I use 4 MOSFET N-channel IRF1404 instead of IRF510 in the schematic The motor should withstand currents up to 100 A and 12v
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2 votes
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Help choosing modern replacement for Hitachi 1SS86 Schottky diode

I’m trying to find a modern Schottky diode to use instead of the 1SS86 Schottky diode (Hitachi version, specifically). I want to use it along with a low current LED to build a lectenna that works for ...
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Automatic power selection circuit design and part selection

I am working on a project that has LIPO battery and a USB as a power inputs. The system should use the battery but if the USB cable is plugged it has to use that as a power source instead of the ...
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help identify part schottky diode

I have an electronic part with a marking mbr10100, i know it is a schotty diode for 10A 100V. The thing is it looks like it has two diodes inside. At least it shows so when i test it with a multimeter....
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Difference Between B330, B330A and B330B?

What is the difference between B330, B330A, and B330B? I read the datasheets but I couldn't notice the difference. I want to use it as a freewheeling diode for a DC-DC converter with 12V input, 5V/4A ...
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SMD Schottky diode part number from marking code

I can't find the part number from marking code. I think it's a schottky diode. Marking is: 94B 1L2 D1 & D2 have the same marking code.
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Reverse Polarity Question

everyone. I have a really simple power input network like so: The SMPS will power analog devices with +12V and the regulator will regulate the rest downstream to power digital circuitry with +5V. ...
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Switching battery and main power supply

I have Li-ion Battery (12.6V) and 15V power supply, also DC-DC buck converter set to 12.6V as charger for Li-ion Battery. My load can take both 12.6V and 15V. I want to use Li-ion battery as power ...
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2 votes
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Boosting 3.0 - 4.6 Volts to 5V

I found this circuit that will auto switch between power between USB (5V) or a LiPo Battery (3.0V - 4.2V range). The schottky diode, D4, can have a voltage drop of about 0.4V which is too high for me....
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