TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
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TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
I had a chance to test the TDK-Lambda 35W 5V 3A, +/-15V 650 mA switching supply.
TDK-Lambda CUT35-5FF Rating: Excellent
Mouser CUT35-5FF product page: https://www.mouser.com/c/?q=CUT35-5FF
TDK CUT35 datasheet: https://www.mouser.com/ds/2/400/cut35-1101382.pdf
Mouser Project Manager for TDK CUT355FF power supply and mating connectors/pins: https://www.mouser.com/ProjectManager/P ... 65b59a493a
TDK-Lambda CUT35-5FF 5V 3A +/-15V 0.65A Triple-output Power Supply
The CUT35 is a mixture of TH and SMT. The 8 pin DIP switcher ICs appear to be a Lambda proprietary part.
TDK-Lambda CUT35-5FF 5V 3A +/-15V 0.65A Triple-output Power Supply
Note that there are dangerous potentially lethal line voltages on the primary side of this supply. Use caution when handling and bench-testing.
The CUT35-5FF is small measuring about 2" by 4".
One unique feature is that the bipolar output and 5V output are isolated and do not share a common ground.
The unloaded outputs measure almost exactly on-target.
The 5V is adjustable.
A minimum load is not required for start-up but it was found that a +/-15V (30V) pre-load current of 15 mA was required for low-noise operation.
If the CUT35 is started without pre-load and the load then added it remains somewhat noisy with sawtooth ripple in the 10s of millivolts.
With the 15 mA pre-load applied at startup, ripple and noise is exceptionally low <4mV P-P measured on the scope.
With a board connected having a 50 mA load I saw no issues with noise.
Measured with the HP400FL analog meter the output noise is -62 dBu (100 kHz filter) and -44 dBu (4 MHz). (-3dB points.)
The CUT35 appears to have two separate converters one for the 5V the second for the bipolar 15V.
It also has two transformers.
The bipolar supply uses a center-tapped transformer with half-wave rectification.
The 5V supply uses a single output winding and a dual diode half-wave rectifier connected in parallel.
There are 4 opto-isolators which cross the galvanic barrier.
The 5V may have one for voltage feedback and the second to detect over-current.
The second pair of optos, on the bipolar supply, along with a second convertor IC suggest voltage feedback for at least one of the channels if not both.
I measured the noise floor of the MS-II connected to the TDK CUT35-5FF and it was as quiet as when powered from the linear bench supply.
That's good enough!
TDK-Lambda CUT35-5FF Rating: Excellent
Mouser CUT35-5FF product page: https://www.mouser.com/c/?q=CUT35-5FF
TDK CUT35 datasheet: https://www.mouser.com/ds/2/400/cut35-1101382.pdf
Mouser Project Manager for TDK CUT355FF power supply and mating connectors/pins: https://www.mouser.com/ProjectManager/P ... 65b59a493a
TDK-Lambda CUT35-5FF 5V 3A +/-15V 0.65A Triple-output Power Supply
The CUT35 is a mixture of TH and SMT. The 8 pin DIP switcher ICs appear to be a Lambda proprietary part.
TDK-Lambda CUT35-5FF 5V 3A +/-15V 0.65A Triple-output Power Supply
Note that there are dangerous potentially lethal line voltages on the primary side of this supply. Use caution when handling and bench-testing.
The CUT35-5FF is small measuring about 2" by 4".
One unique feature is that the bipolar output and 5V output are isolated and do not share a common ground.
The unloaded outputs measure almost exactly on-target.
The 5V is adjustable.
A minimum load is not required for start-up but it was found that a +/-15V (30V) pre-load current of 15 mA was required for low-noise operation.
If the CUT35 is started without pre-load and the load then added it remains somewhat noisy with sawtooth ripple in the 10s of millivolts.
With the 15 mA pre-load applied at startup, ripple and noise is exceptionally low <4mV P-P measured on the scope.
With a board connected having a 50 mA load I saw no issues with noise.
Measured with the HP400FL analog meter the output noise is -62 dBu (100 kHz filter) and -44 dBu (4 MHz). (-3dB points.)
The CUT35 appears to have two separate converters one for the 5V the second for the bipolar 15V.
It also has two transformers.
The bipolar supply uses a center-tapped transformer with half-wave rectification.
The 5V supply uses a single output winding and a dual diode half-wave rectifier connected in parallel.
There are 4 opto-isolators which cross the galvanic barrier.
The 5V may have one for voltage feedback and the second to detect over-current.
The second pair of optos, on the bipolar supply, along with a second convertor IC suggest voltage feedback for at least one of the channels if not both.
I measured the noise floor of the MS-II connected to the TDK CUT35-5FF and it was as quiet as when powered from the linear bench supply.
That's good enough!
It is the liar more than anyone who has reason to fear free speech.
https://ka-electronics.com
https://ka-electronics.com
- mediatechnology
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Re: TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
I needed to run a Phono Transfer System on overnight burn in and do final QC so I used the TDK CUT35-5FF.
I couldn't distinguish any difference in noise floor between running the low-level preamp on the TDK switcher and a linear bench supply.
The TDK CUT35-5FF triple-output bipolar supply rocks! I think its my "goto" switcher. To bad they don't make it in a desktop.
I couldn't distinguish any difference in noise floor between running the low-level preamp on the TDK switcher and a linear bench supply.
The TDK CUT35-5FF triple-output bipolar supply rocks! I think its my "goto" switcher. To bad they don't make it in a desktop.
It is the liar more than anyone who has reason to fear free speech.
https://ka-electronics.com
https://ka-electronics.com
- mediatechnology
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Re: TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
TDK Links for the CUT35 and CUT75 35W and 75W series.
CUT35 Datasheet: https://product.tdk.com/en/system/files ... ut35_e.pdf
CUT35 Instruction Manual: https://product.tdk.com/system/files/da ... 35_apl.pdf
CUT75 Datasheet: https://product.tdk.com/system/files/da ... ut75_e.pdf
CUT75 Instruction Manual: https://product.tdk.com/system/files/da ... _apl_1.pdf
CUT-Series Documents: https://product.tdk.com/en/products/pow ... s_cut.html
Locating TDK Supplies: https://www.oemstrade.com/search/CUT355FF
CUT35 Datasheet: https://product.tdk.com/en/system/files ... ut35_e.pdf
CUT35 Instruction Manual: https://product.tdk.com/system/files/da ... 35_apl.pdf
CUT75 Datasheet: https://product.tdk.com/system/files/da ... ut75_e.pdf
CUT75 Instruction Manual: https://product.tdk.com/system/files/da ... _apl_1.pdf
CUT-Series Documents: https://product.tdk.com/en/products/pow ... s_cut.html
Locating TDK Supplies: https://www.oemstrade.com/search/CUT355FF
It is the liar more than anyone who has reason to fear free speech.
https://ka-electronics.com
https://ka-electronics.com
- mediatechnology
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Re: TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
The TDK CUT35 are in short supply right now. DigiKey currently have in stock the enclosed "/A" version.
https://www.digikey.com/en/products/det ... -A/6874072
https://www.digikey.com/en/products/det ... -A/6874072
It is the liar more than anyone who has reason to fear free speech.
https://ka-electronics.com
https://ka-electronics.com
Re: TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
I need to look at the pre-load results on a few Mean Well. They don’t need it for startup, but not certain of the rest.
Best,
Doug Williams
Electromagnetic Radiation Recorders
Doug Williams
Electromagnetic Radiation Recorders
- mediatechnology
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Re: TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
I'd look for a hiccup mode on the Meanwell when they're lightly loaded.
I don't recall seeing it with their open frame supplies but with the enclosed desktop "Green Power" series the hiccup was pretty bad.
I don't recall seeing it with their open frame supplies but with the enclosed desktop "Green Power" series the hiccup was pretty bad.
It is the liar more than anyone who has reason to fear free speech.
https://ka-electronics.com
https://ka-electronics.com
- mediatechnology
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Re: TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
Good news, Mouser has finally gotten some TDK CUT35 inventory back in stock. https://www.mouser.com/c/?q=CUT35-5FF
72 units OH as of today.
72 units OH as of today.
It is the liar more than anyone who has reason to fear free speech.
https://ka-electronics.com
https://ka-electronics.com
Re: TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
74 to zero in a few days. Those went fast.
Quick, off to Digikey! https://www.digikey.com/en/products/det ... FF/6874071
Quick, off to Digikey! https://www.digikey.com/en/products/det ... FF/6874071
My projects site: https://ornerscorner.neocities.org/
"Things are more like they are now then they ever were before" - Dwight
"Things are more like they are now then they ever were before" - Dwight
Re: TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
And now Digikey has zero. Literally 189 two days ago. Glad I ordered one.
https://www.digikey.com/en/products/det ... FF/6874071
https://www.digikey.com/en/products/det ... FF/6874071
My projects site: https://ornerscorner.neocities.org/
"Things are more like they are now then they ever were before" - Dwight
"Things are more like they are now then they ever were before" - Dwight
Re: TDK-Lambda Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
I have been meaning to make one of these into a bench supply and today was the day. BOM attached for reference. I kept the common for each section next to each other so if I need to tie them I can use a dual bananna jumper plug.
- Attachments
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- 15V supply BOM.xlsx
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My projects site: https://ornerscorner.neocities.org/
"Things are more like they are now then they ever were before" - Dwight
"Things are more like they are now then they ever were before" - Dwight