Hi all,
i'm looking for a commercial DC DC converter circuit that should have
24Vdc and ±12V output ±100mA with very low noise and ripple.
Actually i haven't found any solution after TWO weeks of "desperate" googling...🙁🙁
The only one that i've found was this...
50V, Dual 1A Power Module Solution with Low Noise LDOs, Split-Rail (±5V) Output Voltages - PMP8372 - TI Tool Folder
But they just don't sell it they have only gerber files to let you build it ...and it's a 6 layer PCB so very much expensive!😱
Please if anyone can suggest me any commercial solution i'll really appreciate it...
Thank you all!🙂
i'm looking for a commercial DC DC converter circuit that should have
24Vdc and ±12V output ±100mA with very low noise and ripple.
Actually i haven't found any solution after TWO weeks of "desperate" googling...🙁🙁
The only one that i've found was this...
50V, Dual 1A Power Module Solution with Low Noise LDOs, Split-Rail (±5V) Output Voltages - PMP8372 - TI Tool Folder
But they just don't sell it they have only gerber files to let you build it ...and it's a 6 layer PCB so very much expensive!😱
Please if anyone can suggest me any commercial solution i'll really appreciate it...
Thank you all!🙂
It sounds like you want a power supply that accepts 24 Volts DC as input and has -12V, 0V, and +12V output terminals.
What is supplying the 24V input? How much current is available from it? Or what is its power rating?
Does the 0 Volts terminal for the output need to be able to connect to the 0 Volts terminal of the input, or do any of the output terminals have to connect to anything that is also connected to the input terminals?
If the noise from the 24V input is already low-enough, you could use a simple "Rail Splitter" circuit, to create a virtual ground between the 0 V and the 24V rails, and then call them -12, 0, and +12.
But there would be no headroom to add linear regulators, to lower the noise.
If the noise wouldn't be satisfactory, that way, then you would need to use a switch-mode power supply, i.e. a DC-to-DC converter circuit.
If you got one with +/-15V outputs, you could install three-terminal 12-volt regulators on the outputs to get lower noise.
Check at mouser.com and digikey.com, among others. A quick check at mouser.com found many:
+/-12V out:
DC/DC Converters | Mouser
+/-15V out:
DC/DC Converters | Mouser
What is supplying the 24V input? How much current is available from it? Or what is its power rating?
Does the 0 Volts terminal for the output need to be able to connect to the 0 Volts terminal of the input, or do any of the output terminals have to connect to anything that is also connected to the input terminals?
If the noise from the 24V input is already low-enough, you could use a simple "Rail Splitter" circuit, to create a virtual ground between the 0 V and the 24V rails, and then call them -12, 0, and +12.
But there would be no headroom to add linear regulators, to lower the noise.
If the noise wouldn't be satisfactory, that way, then you would need to use a switch-mode power supply, i.e. a DC-to-DC converter circuit.
If you got one with +/-15V outputs, you could install three-terminal 12-volt regulators on the outputs to get lower noise.
Check at mouser.com and digikey.com, among others. A quick check at mouser.com found many:
+/-12V out:
DC/DC Converters | Mouser
+/-15V out:
DC/DC Converters | Mouser
Hi,
If the 24V input voltage is not a must, but lower voltages may be feasable, then ave a look at Linears website for the LT3471.
A dual switching regulator allowing for up to 16V input voltage and up to +-40V of output voltage. Soldering may present a problem though and don't trust the application notes schematics! If You implement the schematics as is You'll burn the thing with a high chance of probability. Even though informed a couple of times via different 'channels' LT doesn't react and corrects for the failures or at least puts the Appnote offline. Besides that the 3471 is a fine chip for its task.
jauu
Calvin
If the 24V input voltage is not a must, but lower voltages may be feasable, then ave a look at Linears website for the LT3471.
A dual switching regulator allowing for up to 16V input voltage and up to +-40V of output voltage. Soldering may present a problem though and don't trust the application notes schematics! If You implement the schematics as is You'll burn the thing with a high chance of probability. Even though informed a couple of times via different 'channels' LT doesn't react and corrects for the failures or at least puts the Appnote offline. Besides that the 3471 is a fine chip for its task.
jauu
Calvin
You could build the following:
Use a linear regulator to obtain +12V from the 24VDC input
Use a switched capacitor voltage inverter to generate -12V from the +12V rail. There are types that work up to 100mA without much voltage loss (e.g. LT1054) and they are very simple to implement.
This would not require a fancy PCB. The only issue that might need to be addressed is the noise/ripple on the negative rail, however if you can live with slightly reduced voltage you can use RC filtering to clean this up.
-Charlie
Use a linear regulator to obtain +12V from the 24VDC input
Use a switched capacitor voltage inverter to generate -12V from the +12V rail. There are types that work up to 100mA without much voltage loss (e.g. LT1054) and they are very simple to implement.
This would not require a fancy PCB. The only issue that might need to be addressed is the noise/ripple on the negative rail, however if you can live with slightly reduced voltage you can use RC filtering to clean this up.
-Charlie
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