# Tag Info

### What does power balance and voltage balance of a circuit tell? How to calculate them?

I am not familiar with these terms so I can't say they are widely used where I have worked but I can take a guess at possible matches. Power balance sounds like power CONSERVATION, which as you know ...
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### Linear Regulator: What is Current - Supply (max)?

That device uses a PNP pass transistor that requires base current from the ground pin. If the input voltage drops low enough that the LDO cannot regulate the pass transistor goes into saturation and ...
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### Linear Regulator: What is Current - Supply (max)?

No, that is not max current to Vin. Those parameters are poorly copied, if you open the real datasheet it explains it better. What it means is how much the regulator itself consumes while providing ...
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### Linear Regulator: What is Current - Supply (max)?

It is the maximum current at the GND pin: According to the datasheet, which also explains the "dots": limits applying over the full Operating Junction Temperature range are denoted by a “•”...
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1 vote

### How can negative feedback reduce distortion if A*beta>>1?

A main property of any system with negative feedback is that it copies the inverse behavior of the feedback network. Thus, if a (linear) voltage divider with transfer ratio K = R2/(R1 + R2) < 1 is ...
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### Does skin effect increase the eddy current losses inside magnetic core?

The confusion arises from a category error, I think -- skin effect is core loss! If there were no skin effect, we would know that the conductivity of the core is zero, and thus core loss is zero. For ...
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1 vote

### Connecting sets of pc fans to a 12v battery

If the fans are PC fans that typically means either 12V or 5V fans. Since you are talking about phone adapters, I'm assuming you are looking at 5V fans. Don't use a house phone adapter, which is a 100 ...
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### Would increasing the load resistance in a buck converter increase efficiency?

Assuming that the question asked is formulated as you have written that is, "Would increasing the load resistance in a buck converter increase efficiency?" Also assuming that increase ...

### Would increasing the load resistance in a buck converter increase efficiency?

Would increasing the load resistance in a buck converter increase efficiency? Unlikely. The losses in a buck converter will be fairly predictable across a wide range of loads especially if a ...
• 378k

### If we change the PV panel, should we also change the MPPT controller block?

If your MPPT controller can control the load so it matches the rise in PV output impedance when shaded then your energy conversion will be optimal. This demands you regulate PV voltage with solar ...
1 vote

### How do I calculate the potentiometer value for the controlling of Alpha angle of a phase control IC?

From the datasheet on page 7 you have a formula for the current into that 47nF cap C5: (K is apparently 1.1±20%) Since the voltage on the cap is the integral of the current multiplied by 1/C, I get a ...
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### If we change the PV panel, should we also change the MPPT controller block?

A lot of MPPT controllers have a voltage/current range where they perform optimally and a much wider range where they perform "somewhat". You may be operating in this wider range when the ...
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1 vote

### Trouble using PNP as a switch

You are shorting base to ground to activate the PNP transistor. It's emitter is connected to 11.1 volts via an ammeter (very low impedance). This means, almost certainly that you will destroy the PNP ...
• 378k