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Questions tagged [driver]

A chip or a circuit that sends a signal with more current or voltage, or over longer distances.

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31 views

Turning off the LM3914 dot/bar display driver per the datasheet

I'm designing a circuit with an LM3914 dot/bar display driver and want to shut off the entire bank of LEDs based on conditions in the circuit. I'm having some difficulty turning off the driver from ...
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30 views

Is it possible to drive a capacitive touch screen work as a touch simulator?

I want to simulate a finger touch/move/etc. on capactive touch screen. Obviously using a robot arm and stylus pen is a solution, but it was expansive and the structure was too complex. It would be ...
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29 views

Is the same send a pulse with 5V than reduce voltage with driver? [on hold]

I've a conceptual question: if I send a PWM to a MOSFET that drives a Motor with 5V, is the same than using a driver to send from 5 to 0V? For example and be clearer, is the same send a %50 duty ...
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1answer
50 views

Driving a motor backwards and forwards using mosfet and Arduino pin safety

So I want to drive a motor from a handheld drill/screwdriver. And I have managed to get it going using the first schematics, and using pwm to control the speed. The Zener diode is there to protect ...
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1answer
87 views

Driving a butterfly package DFB laser

I want to drive a DFB laser in a type-2, 14-pin butterfly package. The manufacturer has provided limited information on how to bias the laser diode and could not get any information on the reference ...
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1answer
63 views

Mystery Diode in Schematic - MPQ8039 HALF BRIDGE DRIVER

The below image shows four example schematics for the the MPQ8039 Half Bridge Driver. Three of the four examples show a diode connected between the DRV pin (Gate Drive Supply Bypass) and the BS pin (...
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1answer
43 views

How does torque control work in three phase motors?

For a project I am working with a three-phase AC brushless motor, connected to a motor driver. The driver allows digital control over the motor in position, velocity or torque modes. Below are a few ...
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1answer
43 views

Need to know the binary lower bit change impact in circuit

for example if i need 99 decimal number need on output, and ima giving binary digit of 01100011 in Nexperia part and iam replacing that part with Texas part, what is the effect on the circuit can u ...
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31 views

S25FL512S flash driver, read or write not working correctly

I am trying to write a driver for an S70FL01GS chip, which is two stacked S25FL512S chips. I am successfully reading status register, SFDP register, RDID, etc. I am also able to toggle (and verify) ...
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1answer
51 views

Drive a resistive heater from a low power IC

I'd like to drive a resistive heater using an IC operating at 3.3 V. The heater may need to dissipate up to 18 W, and will be powered by a 28.8 V battery. The IC is able to generate PWM signals, but ...
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1answer
39 views

Trouble getting AL8861 LED Driver to illuminate LEDs

I am trying to get a AL8861 LED driver hooked up. Right now I've connected it to a single LED (this one) to test (see circuit below). I eventually intend to connect it to a DAC5578 Digital to Analog ...
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1answer
103 views

Why do my servos break?

I'm messing around with some servos and one by one they stop working. I've got a Raspberry Pi to which I connected a pca9685 servo driver board which in turn connects to 3 of these cheap servos. I ...
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1answer
49 views

RS485 Rx signal connected with two drivers

I wonder why is RS485_Rx is connected with two line drivers while RS485_Tx is connected with only one line driver. Is this some mistake in the schematics or is it some standard circuit for RS485?
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2answers
45 views

MAX232 vs TRS202EC Line Drivers

I have used MAX232 as UART serial line driver using 5V power supply. Now I have come across TRS202 chip in a circuit. It also run with 5V power supply. Does this chip has some special difference or is ...
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1answer
29 views

Error Amplifier Gain

I was studying the "SG3525" IC and its functions, and I encountered this issue: In the "Error Amplifier" section of the Datasheet, there is a parameter that named "DC trans-conductance" which it is "...
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2answers
43 views

Is it appropriate to use the TB6621 or DRV8871 motor driver for powering 12V 1 amp motors?

I'm looking to make an Arduino powered rock crawler with 4 motors (want independent control of each wheel, also need to reverse). I'm looking into buying 12V DC motors that seem to have about a 1A ...
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1answer
48 views

J-Link programmer in Windows 8 don't work

I use the J-Link programmer in Windows 8. A few days ago, my programmer hanged and the LEDs stayed silent, and I, with the help of the Internet, was again using the SAM-BA software to install the ...
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41 views

Appropriate driver amplifier to amplify an FPGA pin voltage for RF applications

I'm trying to built a nanoseconds RF transmitter using an FPGA and an up-converter. However I don't know the correct configuration (I prefer a single IC) in order to drive a nanosecond pulse (pulse ...
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1answer
135 views

Trying to increase amperage of Arduino Uno digital pin (20mA) to control a cabinet lock that is rated at 12v / 2A

I am trying to use my Arduino Uno to send power from one of its digital pins to a cabinet lock, the cabinet lock is "fail-secure," so you send power to it to unlock ...
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1answer
76 views

eeprom driver code c++ overlapping

im trying to write driver for EEPROM (24LC64): page size: 32 byte capacity: 8KB (64Kbit) definition code: ...
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1answer
46 views

Transforming a supply power [closed]

For a recent project i need to power a certain element with .7 amps and 5 volts. my input power is 5 volts, but i need to calculate a circuit for decreasing current. I looked for answers on google and ...
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1answer
120 views

USB Device that acts like a printer [closed]

Our client uses some third party software and devices for their internal work. They print 600 pages per shift and now they wanted to eliminate paper usage without changing their existing systems. ...
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1answer
351 views

Does a MAX485 need decoupling capacitors?

I am designing a small device with two MAX485 chips. Do they need the decoupling capacitors on the 5V power?
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2answers
61 views

What register or setting can control the brightness of an ST7735 based 1.8" TFT Display?

I'm using a KMR-1.8" display which uses a ST7735 driver and it is working ok with the Adafruit_ST7735 library. The problem is the display is very dim once the library has initialized. If I reset ...
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0answers
83 views

constant voltage source + constant current source with transistors

I need a "driver circuit" for my amplifier. It consists of a dynamic current source, a constant voltage source and a constant current source like shown below: The constant voltage source should ...
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71 views

Do I really need motor drivers for a quadcopter? [duplicate]

I am planning to build a quadcopter, so I searched about motor drivers, then I thought "Do I really need a motor driver?", I mean the only thing I want to control is the motors' speeds, so won't ...
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1answer
58 views

How to change ferrite core of transformer

we want to replace EE20x10x6 ferrite core to FED 25 to reduce height of transformer.This is for LED driver ,we have all data for EE20x10x6 means turns for input,output,and auxiliary winding with ...
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2answers
74 views

How to determine PWM Frequency of a MOSFET to drive a BLDC motor?

What are the factors determining the PWM Frequency of the MOSFET driver circuit that drives a BLDC motor. Is there any equation for PWM calculation? For eg. I need to control the speed of a BLDC ...
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1answer
67 views

Potentiometer min and max value

I purchased several of these to drive high power LEDs on a custom project : https://www.amazon.com/gp/product/B019W4C5IE/ref=ppx_od_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 These LEDs are to be ...
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2answers
32 views

What is an example of driver and receiver chips for a PCB?

I am watching some tutorials on signal integrity and the instructor keeps referring to a driver and a receiver. I am a little confused what exactly this would be when designing a PCB is the driver ...
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1answer
18 views

Can a power surge have a different effect on a led driver when floating?

I have a LED driver which has 3 connections on the AC side , L,N and ground. In the event of power surge, can there be a difference in effect if the GND connection of the LED driver is floating or ...
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2answers
82 views

Driving a 4-wire Hard Drive Motor

After reading many contradictory accounts of the "proper" method, I would like to clear it up: what is the correct method for driving a 4-wire, star configuration hard drive motor? What I have ...
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1answer
165 views

Driving MOSFET with 5V PWM for 12V fan speed control

I came up with this circuit to control a 12V 6A fan's speed, with a 5V PWM from another circuit. I'm not sure if it's going to work (I'm not very experienced nor knowledgeable in electronics) and I ...
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1answer
424 views

Why does turning a MOSFET ON too fast cause ringing?

Going though app notes, I can understand that turning it off (i.e. when drain-source voltage is increasing) can cause ringing due to parasitic NPN and also drain-gate capacitor which can charge the ...
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0answers
39 views

Not All I/O Pins Work for Nixie Driver on Arduino MEGA and ATMEGA1284PU

I am tearing my hair out, and help would be immensely appreciated. I am developing a nixie RPN calculator. I am using nixies being driven by K155ID1 nixie drivers, connected to an ATMEGA1284PU. I ...
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1answer
61 views

What methods exist to introduce dead-time in a MOSFET H-bridge? [closed]

What methods exist to introduce dead-time in a MOSFET H-bridge? (to prevent shoot-through) (other than software methods, or using MOSFET driver ICs with internal dead-time generators)
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1answer
1k views

Is turning off MOSFET too fast, bad?

As far as i understand turning off a MOSFET too fast, is bad, as high drain-source dv/dt can cause ringing through: a) biasing Parasitic NPN and: b) charging the GS capacitor through DG capacitor, and ...
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1answer
55 views

What's the purpose of diode between high side and low side supply voltage of IR2110?

What's the purpose of the diode between VCC and VB?
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2answers
52 views

Can i use IR2110 for two independent MOSFETs?

Can i use IR2110, and feed it with two independent PWM signals, to drive two independent MOSFETs, each controlling a separate motor? (or high side and low side inputs/outputs of this chip gonna affect ...
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1answer
73 views

Driving MOSFET from MCU with BJT

1- What is the purpose of D1 in this circuit? 2- Can i connect the PWM output of MCU to Vi through a diode, to protect the MCU from 12V supply of the drive circuit? (e.g. if Vi got accidentally ...
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36 views

L298N motor driver output error

I had worked previously on a project which used a L298N motor driver to control motors.Datasheet Link. I have now completed my project and started with the production phase of it. But while I was ...
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1answer
57 views

Stepper motor - How to choose a driver

I want to know how can I choose stepper driver, once I have decided on the stepper motor that I wish to use. This is how I understand it: If a motor can draw a current of say 0.5 amps and operates on ...
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1answer
42 views

Problems with Stepper Motor & SN754410

I am using a stepper motor for a project, it is the first time I've used one. The internet said it was very simple and easy but that's not true for me. I bought this motor from digikey https://www....
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1answer
34 views

MC33926 Motor Control Rise Time

I am using a MC33926 motor controller. Unfortunately, I am not extremely familiar with motor controllers and have a question. The circuit below shows the circuit that I am working with. The drivers ...
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1answer
31 views

NTE 4050 buffer and current sourcing capability, datasheet reading woes

I am trying to construct an output that is switched on by the inputs to a buffer. The buffer input, in the final design, will be sourced from an Arduino or Raspberry PI. I needed the buffer because ...
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0answers
41 views

Microchip MRF24WN0MB datasheet for use in STM32

We have designed a board where a Microchip MRF24WN0MB WiFi is connected to an STM32L082 ARM micro-controller through SPI. I can generate code with STM32CubeMX (compiled with Eclipse SW4STM32) and run ...
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2answers
295 views

Bootstrap mosfet driver with ir2101

I am trying to build this circuit but I don't know how to test it. When I am measuring the voltage on the gate of high side mos is almost 12 volt like VCC. So to speak .. the boostrap circuit isn't ...
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1answer
66 views

So, ?nobody? makes a high(er) current tri state driver chip? [closed]

I'm wanting to charlieplex some 100ma LEDs, and I can hardly believe no one makes a higher output tri state driver. I know how to do it with discretes, but Prove me wrong, please.
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1answer
65 views

Difference between driver and transistor

I asked a question earlier question, "Is it safe to run Logic ICs at their maximum output current?" asking if it was safe to run logic ICs at their maximum current. From what I understand, this is ...
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4answers
77 views

Is it safe to run Logic ICs at their maximum output current?

I am building a circuit that will ultimately output to 8 7-segment displays. I am going to be multiplexing these displays. The displays I chose are https://uk.farnell.com/kingbright/cc56-12surkwa/...