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Results tagged with dc-dc-converter
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user 90588
DC-DC conversion. Implies conversion of a DC voltage level up or down. DC-DC converter can be isolated or non-isolated. Electronically it can be done by many kinds of circuits, depending upon the application (charge pumps, voltage multipliers, linear voltage regulators, boost/buck switched converters, etc)
1
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Switching frequency impact on DC-DC converter output voltage
To a first approximation, in a real buck converter the output voltage is only dependent on the switching duty cycle and the the input voltage. There are small deviations from this because of voltage d …
- 20.4k
1
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Buck Converter Control Scheme- Why isn't just a comparator not enough?
Actually a hysteretic converter has very good load transient response as it is not slowed down by compensation. However, as in the previous answer, the switching frequency is not well controlled, and …
- 20.4k
0
votes
Power Converters - Small Ripple Approximation
Fundamentally it means that the voltage across the inductor (=VIN-IR-VOUT, or -VOUT+IR) doesn't change significantly during that portion (HS switch on, or LS switch on) of the switching cycle. Therefo …
- 20.4k
2
votes
Is it possible to eliminate output ripple of SMPS's by using two parallel SMPS's to produce ...
While you can't eliminate all the ripple, you can eliminate all components at the fundamental switching frequency by using a dual-phase switcher. An n-phase switcher can eliminate all harmonics up to …
- 20.4k
2
votes
I have made a 50W solar mppt charge controller, but don't have a solar panel. What can I use...
Assuming its a nominal 12 V panel, use a lab power supply. Set the output voltage to ~ 16-18 V, and set a current limit. This current limit represents the solar illumination level. So if it's a 12W pa …
- 20.4k
2
votes
Output current effect on inductor value selection for SMPS
Io*LIR is basically the ripple current in the inductor. It is reasonable to have this 30 % of the maximum load current, but in efficiency or cost considerations may be optimized with a different value …
- 20.4k
6
votes
What is the purpose of capacitor C4 (47 pF) in the feedback network of this buck converter c...
Maintaining AC loop stability in a DCDC can be complex, although since this AP63300 uses a current-mode controller, it is a little easier. However it is still important to avoid adding unwanted respon …
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0
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Accepted
MAX5035 Buck Converter Internal Body Diode
A diode is absolutely required for this IC to function. The VF of the diode is perhaps not so strictly required; a well-designed IC should not have strict requirements on this parameter (it should not …
- 20.4k
0
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How does a switching regulator behave if its input is equal to its output?
Most DCDCs configured in buck mode will try to operate at 100 % duty cycle -- i.e. the high-side switch will be 100 % on.
In the LM2596, since the output is a BJT device, this means that the output ca …
- 20.4k
0
votes
Accepted
Output Capacitor RMS current
Remember that a capacitor doesn't carry DC current - it's basically a filter to minimize the ripple at the output.
Therefor when the inductor carries a current which is a sim of a DC load current plus …
- 20.4k
0
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Automatic buck-boost DC-DC 1-15 V to 5 V, 5 A
Since the additional energy you might get out represents only 10 % or so of the capacitor's storage, it may not be worth doing as it may degrade the overall efficiency of the primary buck mode by more …
- 20.4k
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vote
Instantaneous change in DC electronic load power
There are two aspects to this. First is the speed (rate) at which the load transient is applied. Some (generally lower voltage, for processors) are designed for load transients of full load in << 1 us …
- 20.4k
2
votes
Can a synchronous buck converter be operated in reverse?
Yes, this works and is normal.
Note that there are some things to be aware of.
If the controller is a current-mode one, it may not be able to handle negative current flow.
While the circuit is boostin …
- 20.4k
1
vote
Experimental efficiency curve of a buck converter
If your DC/DC doesn't have a synchronous rectifier (i.e. it uses a diode), then your analysis is generally correct.
The major losses in the DC/DC are:
1) Diode -- inversely proportional to duty cycle …
- 20.4k
2
votes
Help connecting solar cells to be 12 V
It doesn't work that way.
If you connect two groups in series, the output current you get is the lowest of the current from either group. Thus you'd get 12 V (11.5 + 0.5), but only 3.6 A.
Secondly, …
- 20.4k