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A 20 kHz inverter can work with primary switching SMPS, but only if they have fast input rectifiers and no EMI filters effective in the 20 kHz range. Otherwise it can damage the connected device as mentioned by betwixt. To avoid possible damage, it's safer to rectify the inverter output on board and supply high voltage DC. Very bad that the
SCR crow-bar circuits have been used since long and are surely effective. The threshold would be more precise if R205 is connected to 24V node. You should check that the PTC fuse can stand a full short without damage.
The term "effective threshold voltage" has been created by the author to explain the operation of the circuit. Actual threshold voltage doesn't change. A (more?) simple explanation is that with DCout above Vth both MOSFETs start to conduct simultaneously.
Hi, I have understood that if the Vds of an NMOS is greater than overdrive voltage, the NMOS channel will be pinched off. If we increase the value of Vds, the channel will be more pinched off towards source and hence, the effective channel length will be reduced. My question is: If the channel is pinched off, how can the electrons from from so
The trick with DC startup circuits is to get them to be always effective, but also always "shut up" once the output is up at its proper value. This depends to some extent on the loop amp's gain at lower than normal output voltage (amp must "snap in" nicely). By the time the output reaches designed setpoint, the output voltage must be enough (...)
It appears as though you want a pulse extender. It might be effective to include a series diode in addition to the RC network. for at least 100 ns after the falling edge of the input pulse The capacitor charges and discharges through different R values, creating different RC time constants. Small current is available, which suggest
The link is of no value. Define you load impedance , voltage and peak current desired. compute effective transformer input Z, V, I peak and its source and switch R in order to sustain the voltage within 5 to 10% output range at full load. This determines what's needed for parts. There is a simple but brute force method of switching at 50 (...)
"voltage < or > ground" can be a DC offset which doesn't change the "effective" capacitance. Or a variable voltage depending on the capacitor voltage (generally a*Vcap). Miller and similar effects are observed only in the second case.
I tried to design R2R DAC structure at in my circuit. In my thought R2R DAC is more area effective DAC than conventional R-String DAC. However, R2R DAC has some disadvantages. 1. VCR Issue - In CMOS process, poly-silicon resistor or diffusion resistor has voltage coefficient. that is to say, resistor value is dependent for (...)
Is "Read the manual" asking too much? For the said UT33A, the AC measurement is specified as Displays effective value of sine wave (mean value response) That could be expected for a non "true rms meter", it's measuring averaged rectified value, result is corrected to be equal with rms for sine voltage. Example, average rectified
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 the gate
Step-down converter with no feedback to regulate output will follow the peak voltage of an unloaded AC input. Loaded may drop up to 40% to Average after rectification depending on effective RC filter and loading.
I need to decouple two circuit blocks. The spec for the low noise block is 10mvpp ripple max. Adding 3 100uF ceramic capacitors allows me to achieve my 10mvpp spec However this will be a costly solution. I have been advised an RC filter in the power may be effective and simulation with 10R/100uF does look like it will bring me into my 10mvp
The audio draws power from the DC source. The DC source is not a true voltage source and has ESR or effective series reistance. Thus injected audio can reduce supply voltage when current increases. We call this % load regulation, the ratio of change in source DC voltage with full load signal.
DC Link Caps supply the impulse currents created by the step load voltage. The max Current is a result of the total effective Series Resistance (ESR) including Cap, Bridge and load coil resistance. Thus the %ripple on the DC link is just the ratio of the Cap. ESR to the total ESR for switching of V+. Normally for low supply ripple of 1%, t
Noone wants a identical turn-off and turn-on thresholds of 90 V. To prevent frequent turn-on/off, there must be an effective hysteresis. According to design equations, it's about 18% which seems reasonable at first sight. Did you notice that turn-on threshold is based on peak AC voltage and turn-off threshold on average? Because mains (...)
To which spec are you referring? I noticed that different specs have different assumption about the lateral (horizontal) and vertical voltage strength of inner layer insulation, resulting in different spacing rules. Apparently some specs assume that the layers may be delaminated, cancelling the effective trace encapsulation at inner layers. Similar
Circuit (a) is simply a voltage follower unity gain with AC coupling due to effective input resistance R ( big) and series input Cap, C , T=RC. THe result is DC or low frequency blocking and output will be at same DC voltage as (+) in this case ground. Circuit (b) is an AC divider amplifier just like a resistive divider amplifier (...)
Consider the charging series resistance* capacitance time constant is multiplied by the duty cycle of the diodes. If forward biased 50% of time, the ESR of diodes and supply is x2 . Diodes have a fairly low but non zero effective series resistance ESR that depends on bulk size of diode and thus voltage rise above saturation and thus current limit.
I have an input voltage around 50VDC and I want to derive power for MCU from the same source. The output voltage is +3.3VDC 2A. Please suggest the most cost effective devices for the circuit. I have seen the TI Webench Designer for power and they have excellent designs and every possible solution. But when I buy a perticular TI or any (...)