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YH11068A 10-32V to 45-390V dc/dc - guess the control ICs
YH11068A 10-32V to 45-390V dc/dc - guess the control ICs
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Old 24th September 2016, 10:39 AM   #1
trobbins is offline trobbins  Australia
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Default YH11068A 10-32V to 45-390V dc/dc - guess the control ICs

You may have seen this neat dc/dc available recently, especially given the wide variable B+ setting capability, and quite high power rating, and ability to run off 12VDC.

Click the image to open in full size.

For low power valve amps (eg. up to 6V6 push-pull) they should make it very convenient to power just from a 12VDC 4-5A plug-pack.

The initial intrigue is what control IC's are used, as the 8-pin packages are defaced.

To help the guessing game, the attached doc has my first pass at a schematic drawing. No doubt I've misinterpreted a few parts, and the IC pin numbers are based on what I think are the pin 1 dimples that haven't been defaced completely.

Some strong power saving pulse skipping is going on, which appears as low frequency ripple at times, and at other times it is just pulse skipping at 70kHz ripple. The FET drain waveform is pretty clean and fast, given the simple pcb and parts. The current sense filter cap ground and IC ground seem a compromise of layout. The turn-on appears to be trying to occur close to a zero-voltage dip. No load loss is pretty good.

http://dalmura.com.au/projects/YH11068A.pdf

Ciao, Tim
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Old 24th September 2016, 09:57 PM   #2
payloadde is offline payloadde  Europe
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I have one of the fully populated bipolars. I only use it as adjustable ps to measure tube curves, not audio.
It is definitely a ZVS controller (zero voltage switching), hence the pulse skipping and irregular bursts which you observed.
Might be one of the 8-pin ZVS PFC controllers normally used for power factor correction.
After all electronic PFC is sort of a boost converter in front of SMPS ...
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Last edited by payloadde; 24th September 2016 at 10:04 PM.
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Old 25th September 2016, 10:06 AM   #3
ballpencil is offline ballpencil  Indonesia
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What is the strategy of adding bypass cap on the actual tube amp pcb with these boards? I don't understand boost controllers much but with the existing 10uF cap on the module, how much more capacitance can i add on separate board? Sorry if i mess up the thread.
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Old 25th September 2016, 10:54 AM   #4
trobbins is offline trobbins  Australia
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How the power supply would cope with more output capacitance would probably depend on the control IC and how it is set up.

But normally one would provide some impedance between two capacitance nodes, to minimise the local current flows to the local circuits - otherwise you get smps currents flowing over to the amp, and amp signal currents flowing over to the smps. That impedance can be resistance, inductance, or a mix.
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Old 7th February 2017, 12:42 AM   #5
Goulton is offline Goulton  United Kingdom
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Default YH11068A

I know its several months since the last post but I have one of these units without the IC numbers defaced.

Does anyone still want to know these numbers or have you found them from other sources?
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Old 11th February 2017, 12:01 AM   #6
trobbins is offline trobbins  Australia
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Quote:
Originally Posted by Goulton View Post
I know its several months since the last post but I have one of these units without the IC numbers defaced.

Does anyone still want to know these numbers.... ?
Yes please!!
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Old 11th February 2017, 05:02 AM   #7
luka is offline luka  Slovenia
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YH11068A 10-32V to 45-390V dc/dc - guess the control ICs
it's the UC384x, don't see the last one, probably the 3843
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Last edited by luka; 11th February 2017 at 05:05 AM.
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Old 11th February 2017, 06:21 AM   #8
trobbins is offline trobbins  Australia
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Thanx so much. I'll look them up asap. Was the same device used for both ICs?
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Old 11th February 2017, 09:11 AM   #9
luka is offline luka  Slovenia
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YH11068A 10-32V to 45-390V dc/dc - guess the control ICs
Quote:
Originally Posted by trobbins View Post
Thanx so much. I'll look them up asap. Was the same device used for both ICs?
No, it wouldn't make any sense to use two controllers. If I had to guess, I would say it is lm358, yet I have only one partial number, which looks like 3, but like I said, that could be 8 and for that lm358. Would also me sense to have opamp if anything. And it has to be dual, one for voltage sense, one for current sense... sooo, lm358 fits the bill
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Old 11th February 2017, 09:26 AM   #10
trobbins is offline trobbins  Australia
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Ok, the UCC3843(B) has the 8.5V UVLO so it matches the performance for the switchmode IC controlling the FET. The IC Vc pin 7 is taken from the 78L09 regulator.

My schematic was missing the RC oscillator parts from reference pin 8 to pin 4 and gnd, and a bypass cap in the ref pin.

A 40mohm current sense makes the flyback peak current up to 25A, with RC deglitch to pin 3.

My schematic is also wrong around the oscillator and current sense - the datasheet slope compensation circuit is used to manage >50% duty cycle stability.

Feedback is to pin 2, with integrator error amp, and shutdown applied to pin 1.

Yes a 358 does make sense, with outputs at pins 1 and 7 to force control of the feedback level, and shutdown. Thanks.

Last edited by trobbins; 11th February 2017 at 09:28 AM.
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