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External Cge is a usual means for high voltage IGBTs (4500 V class) to improve switching behaviour. For 1200 and 1700 V, it's not generally helpful and not usually suggested as far as I'm aware of. For the "oscillation in short circuit situation" point, we have to look for the overcurrent shutdown behavior of the specific driver. I doubt that t
The effective gate charge that must be delivered by the gate transformer will considerably increase when the supply voltage is turned on. In addition, transformer inter-winding capacitance can have an effect. The first (no supply) waveform already suggests that the driver circuit is much too weak. It takes several microseconds to charge (...)
I am building a humanoid robot with DC motor actuated fingers. There are 16 brushed DC motors to be position controlled with help of hall effect sensors implanted at the joints of each fingers. I need a developed driver board to control these 16, 3 watt, 12 v,DC motors. Also each motor is equipped with an incremental encoder for speed control. t
For the life of me I cannot find a circuit design to use as a twinkler effect to operate a 15 watt x 12 volt LED. Can someone assist me?
Hi guys, I just want to share one of the point related to the design of the microwave/Rf packages ,operating at ku-band, during the design of the rf package which consist of Rf section (three LNAs cascaded together), LO section ( Active doubler circuit, and a driver amplifier) and a down converter section( a schottky dio
It's not a darlington amplifier. It's a push-pull output driver: In certain cases (eg when driving MOSFETs), it's referred to as totem-pole driver. Darlington transistor/pair: A simple Google search should clear your doubts on push-pull ou
Depends on the the bit rate and driver output current.
Hi Saif, I think long lines are a capacitive load when turned on, causing a this high inrush current. Only a build in shortage protect could help. If you switching off long lines with an open collector driver you are faced with the inductance of the line and can cause high voltage spikes. Maybe you take a look at the way the industrial 24V line dr
That specific driver was intended to boostrap the drive current to a high voltage offset switch. So if you are not doing that then FvM's explaination for standard Bootstrap circuits is applicable as is the Wiki example with the desired effect to raise input impedanc
Is this method reliable for driving segment LCDs ? Does it have any effect on lifetime of LCD? Drive segment LCD with a microcontroller GPIOs using software method and using a timer for its timing for generating square waves. Or I do not use this method for segment LCD (STN blue segment LCD with white backlight) and use driver IC or micro wit
Of course you can. And since the +ve input of an opamp configured as a non-inverting amplifier is the input, it would also mean that your input driver must be able to drive the 1mF cap as well.
LM317 is not a constant current source but a STABILIZED voltage source. True. But all an LM317 does is adjust output voltage until it has 1.25V between output and Adj reference pin. By (ab)using that, you can use an LM317 as regulated CURRENT source (and I have!). It's just a different circuit than LM317 standard
what do you think about adding a cap in parallel with the resistor ? I think, you can omit two components, place a short instead and get basically the same effect: The current will be only limited by the processor output driver, and surely exceed the specified maximum values. RCinFLA mentioned, that short current spikes exceeding
you could add an additional driver and resistor combo for each LED. this wouldn't effect the circuit. something like this Digi-Key - MC74LCX125DTGOS-ND (Manufacturer - MC74LCX125DTG)
How to design an integrated PowerMos driver.... My powerMOS cgs is quite large...(IRF730). Please help me how to design this properly. For my initial design, I used inverter buffers with increasing sizes from (first inverter) m=1, 2nd inverter : m=3, 3rd m=9, 4th m=81, m=246, and so on. My W/L is 8u/2.5u for PMOS and 4u/2.5u for NM
In High speed digital circuits if driver impedance is less than the tracer impedance of connected to Receiver then there is overshoot and under shoot will occur and as a result signal will be ringing. Upto what level the signal overshoot and under shoot can be bearable. if over shoot signal will be with in the nosie margin of the receiver level th
hello when i switch on my LED driver, it puts an overcurrent surge of 2 Amps through the 700mA LEDs for about a millisecond. This happens every time the LEDs are switched on (about three times a day) Will this affect the lifetime of the LEDs? this is the LED datasheet but does not tell it.
Dear Friends, I am new to the power electronics. I designed 3-phase bridge using SGP23n60UFD IGBTs, FAN3788 used as driver circuit. Due to dv/dt the lower IGBT is turning on (shoot through). The IGBTs going bad. How to over come dv/dt effect. Regards V. Naresh Kumar
hi, I want to measure the current speed of BLDC motor driver circuit one I/O pin is avaliable Known as SPEED OUT how to measure the speed without any instrument?
Hi everyone! I have query regarding BLDC motor. What parameter decide the optimum PWM frequency for commutaion of the BLDC? I mean what will be the maximum PWM frequency to control the MOSFETs at driver side of BLDC controller and how one can know that value? What will be the effect on motor performance if PWM frequency is