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Current-Mode PWM Controller
It is good practice on a standard PCB board to make the traces an absolute minimum of 15 tl3842 0. Peak current Tl3842 is determined by the formula: Stick cores usually emit the most unwanted noise. Some examples would be toroid tl3842 encased E core inductors.
Some designs require the use of a feed-forward capacitor connected from the output to the feedback pin as well, tl3842 for tl3842 reasons. Surface mount components are recommended here as well tl3842 the same reasons discussed for the filter capacitors. Timing and bypass capacitors should be connected close to tl3482 GND terminal in a single-point ground.
tl3842 Supply Current vs Tl38422 Voltage. It is good practice to use one standard via per mA of current if the trace will need to conduct a significant amount of current tl3842 one plane to the other.
TL Current-Mode PWM Controller |
tl3842 Arrange the components so that the tl3842 current loops curl in the same direction. Tl3842 compensation components for stability should also be placed close to the IC. Run the feedback trace on the side of the PCB opposite of the inductor with a ground plane separating the two.
A small RC filter tl3842 by resistor Rf and capacitor Cf may be required to suppress switch transients. This tl3842 reduce tl33842 EMI radiated by the power traces due tl38842 the high switching currents through them.
In the open-loop laboratory test fixture see Figure 13high peak currents associated with loads necessitate tl3842 grounding techniques.
Open core can be used if they tl3842 low EMI characteristics and are located a bit more away from the low power tl3842 and components. This will also reduce lead inductance and resistance as tl3842, which in turn reduces noise spikes, ringing, and resistive losses that tl3842 voltage errors.
Also, keep the feedback trace to be as direct as possible tl3842 somewhat thick. Place the power components so that during each of the two tl3842 the current loop is conducting in the same direction.
For multi-layer boards with more tl3842 two layers, a ground plane can be used to separate the power plane where the power traces and components are and the signal plane where the feedback and compensation and components are for tl3842 performance. When using a low value ceramic input filter capacitor, it should be located as close to the V CC pin of the IC as tl3842. Always try to use a low EMI inductor with a ferrite type closed core.
This circuit demonstrates tl3842 setup and use of the TLx and TLx devices and their internal circuitry. The design techniques in the following sections may be used for power supply PWM applications which fall within the following tl3842. These two sometimes involve a trade-off, but keeping it away from inductor EMI tl3842 other noise sources is the more critical of the two.
tl3482 It would also be a good idea to have a ground plane on both sides of the PCB. One tl3842 when the switch is on and one when the switch is off. In this tl3842 it should also be positioned as close to tl3842 IC as possible.
tl3842 Due to the way switching regulators operate, there are two power states. Make all of the power high current traces as short, direct, and thick as possible.
This will reduce noise as tl3842 by reducing tl38422 loop errors as well as by absorbing more of the EMI radiated by the inductor. These should not be located tl3842 close to the inductor either.
Using surface mount capacitors also reduces lead length and lessens tl3842 chance of noise coupling into the effective antenna created by through-hole components. Information in the following applications sections is not part of the TI component tl3842, and TI does not warrant its accuracy or completeness.
Tl3842 should validate and test their design implementation to confirm system functionality.