# Tagged Questions

140 views

### What is the most efficient way to power a solar computer (5V) from a 12V lead acid battery?

My project: Power a Beaglebone Black (BBB) entirely from solar energy. Obviously energy efficiency is crucial here. My setup so far: PV panel connected to a deep-cycle lead acid battery. Now I need to ...
80 views

### USB host power dc/dc converter chip [closed]

I'm looking for a (cheap, surface mount) single-chip dc/dc converter to power a USB connection. I'm thinking that with so many USB chargers available, there might be a chip available specifically ...
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### 0-24V 0-47A DC-DC Converter

I have built a 12/24V 47A DC Power supply following this guide. It works well for running my battery chargers, but I'd like to make it a CCCV supply from it for my projects. What would it take to ...
169 views

### Obtaining 12 V from a 20-250 V DC source

I need to get 12 V DC from a high voltage source. The high voltage comes from a wind turbine. The voltage level changes randomly according to the wind speed. Its voltage can go up to 250 V DC. This 12 ...
245 views

### Simple Efficient Cost-Effective DC-DC Converter Circuit?

Is there a switched-mode DC-DC conversion circuit that makes it easy to configure different input/output voltages? Circuits given on the datasheets of the LMR12020 and others have a large number of ...
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### What actually is the output current of a boost conveter?

What I understood at least at a basic level the operation boost converter, the inductor supplies output current when the switch is OFF. When the switch is ON the the load current is taken current ...
63 views

### Current mode PWM Controller

I'm analyzing a power supply design. A Current mode PWM controller is used to step down the i/p 45-57 V/350 mA to 5 V/3 A. The design uses this part, ...
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### How can output voltage and current of a DC-DC converter both be higher than input?

I'm working on a TFT LCD Supply and using a step up DC- DC converter from Maxim, the MAX17062. I want to find the input current. The datasheet lists that as 2.5mA. I have a doubt: if the input current ...
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I'm using the NTE0506MC DC/DC converter which boosts 5V to 6V. The output voltage I'm measuring with no load is 9V not 6V. In page 3 of the datasheet they mention that it needs a minimum load of 10% ...
524 views

### DC DC Converters in Parallel for double current

I am using a 15V 7A DC DC converter for powering a robot. I am looking for a 15V 20A supply. For this can I put three of those regulators in parallel and expect them to provide about 20A of current? ...
232 views

### Cheap and simple step-up converter

I would like to build simple and small power supply for my projects with microcontrollers. This supply should be powered by two Ni-MH batteries and output should be 5V (maximum current 500mA). I know ...
132 views

### Building a motorcycle accessory power connector - Values for capacitors and diodes?

After finding out that a component I wanted to base a circuit around isn't suitable, I've found a possible replacement part, but I have questions about the values for Cin and Cout capacitors and the ...
234 views

### Atx psu 7v output

What is an easy way to get 7-7.2vdc from an scavenged atx psu? I had thought about using a lm317 but I'm going to need at least 5-7 amps of current, and the 12v-5v split just sounds like a really bad ...
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### Adjustable 9v - 15v 1.5A DC Switching Power Supply from 6 D batteries

I am starting a project that needs a way to adjust a 9v supply to anywhere from 9v - 15v at 1.5A. The power is coming from 6 D cell batteries so the voltage will drop as the batteries wear down. ...
2k views

### Should I isolate grounds of an isolated DC/DC converter?

If I use an isolated DC/DC converter, when designing the PCB, should I isolate the ground of the input and the ground of the output as shown below? I've never isolated grounds (except for AGND and ...
132 views

### how to test isolation of DCDC convertor?

I have an isolated DC-DC convertor which boasts a 1.5kV isolation. I have a PCB made along with the additional components it requires. How can I test it?
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### Need help with a DC-DC converter using a MC34063

I'm trying to make a DC/DC converter from 12V to 5V using a MC34063. I found an old cell phone car charger and removed everything and set it up on my breadboard. I'm getting 5V out but only 0.12A. ...
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### Building a simple switching regulator for DC12V -> DC5V

I want to build a circuit that provides USB power from a 12V battery (lipo or car battery). I have an iPad that draws 2A from its charger: So I'd like to get up to 10W output. What's a good choice ...
426 views

### DC supply for control circuit of a DC-DC converter?

I have a switch mode DC-DC converter assignment which is supposed to convert 36-72V input DC voltage to 9V DC voltage. The circuit I'm working on contains a control circuit (implemented with a custom ...
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### Cost effective way to convert 12v DC to 7.6v DC @2A

I'm working on a hobby project that involves continuously powering a 5 watt handheld radio for long periods of time off a 12v automotive electrical system (in reality the input will be more like ...
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### Negative Inductance and Cascaded DC/DC Converter Instability

I'm trying to debug a pair of cascaded DC/DC converters and have ran into a brick wall. The local FAE said that it is probably something to do with "Negative Input Inductance" on the second converter ...
2k views

### Ultra low noise power supply

I am trying to design an ultra low noise power supply for my sensitive circuit. The supply will provide 5V and 600mA. (Worst case, 200mA typical). My input voltage is 2V to 4V. My ripple target under ...
1k views

### Calculating Power Loss in Switching Power Regulator?

I am new to the construction of DC/DC power supplies (still a university student) and have built basic supplies using simple linear voltage regulators. I have recently discovered the world of ...
629 views

### is it OK to stack several DC-DC converters with their inputs connected in series to support a larger input voltage?

Imagine I have a single-IC switching DC-DC converter which supports input voltage up to 16V, for example a LM2727. Can I stack the inputs of such converter in series, for example 64 of them, and be ...
2k views

### how to build a high-power (4kW) switched-mode DC-DC converter?

I would like to build a switched-mode DC-to-DC converter which should support up to 4000 W of power. It should be able to act as a CCCV power-supply, so supply a constant current Imax up to the point ...