THz, will a 2ch DSO be adequate ?
Yes, quite. I already have lots of scopes, but they are all old and big. And I generally take the position 'if I can't get a service manual with schematics, then I'm not buying it.' Hence my not having any modern test gear.
But I currently have some spare cash, so I'm making a list of nice things to buy. A modern small scope with 'virtual phosphor' style display is at the top. (I hate jaggy displays.)
'Decoders' is a requirement because it's cool, and saves mucking around with big logical analyzers.
And because I _thought_ I have a current need - getting a TV LCD backlight power board under control.
Have a look at the 200 MHz SDS1202X-E.....SPI, I2C UART, CAN and LIN decodes as standard....and BTW don't let anyone tell you you can't decode SPI with a 2ch DSO as Clk Timeout settings allow expressly this.
Ha ha, no one has, and I wouldn't have known. Never used SPI... so far.
But anyway...
Thanks for the suggestion. It and the Rigol DS1054 are under consideration. I need to read the 'scopes matrix' thread.
I'll still buy such a scope soon but am no longer in a rush, because I hit the jackpot with this 'plays music' scrapped TV. The LED supply controller IC turns out to use an analog brightness control signal!
LED backlight switchmode supply chip, is a 16 pin SMD. Markings:
OZ9976AGN <--- This is the part number
CJ6L26.1N
1747A1
Pretty much the only search result was this nightmare site:
http://html.datasheetbank.com/datasheet-html/142223/ETC/1page/OZ9976GN.html?lang=enHave you ever seen a more messed up 'catalog'? (And the PDF download doesn't work.)
The IC manufacturer is
http://www.o2micro.com/Their current catalog pdf does not include the OZ9976. Nor do they seem to have any actual datasheets online.
But the datasheetbank mess does say:
From page 8 of the stupidly dysfunctional online cat:
OZ9976 FEATURES
• Offline Inverter Controller (IPB)
• Supports both fixed and variable frequency applications
• Half-bridge or push-pull topology
• Directly drives pulse transformers
• Dedicated pins for Analog and LPWM dimming
• User-defined minimum operating frequency
• User-defined striking frequency range
• Open-load, over-voltage, and under-voltage lockout protection
• User-defined striking and shutdown delay timers
• Soft start function
GENERAL DESCRIPTION
The OZ9976 is a high efficiency, Pulse Width Modulation (PWM) controller designed
for off line LCD backlight application. It achieves high efficiency power conversion
with minimal switching loss using Zero Current Switching (ZCS) technology. OZ9976
applications can operate under fixed or variable operating frequency with ZCS tech-
nology.
The minimum operating frequency can be set by either an external RC network or
operate in self-oscillating mode. The intelligent operating frequency management
circuitry extends Cold Cathode Fluorescent Lamp (CCFL) lifetime and offers design
flexibility
It appears the word "offline" is code for 'no micro involved', ie analog & PWM control inputs.
Fingers crossed I can use a pot for brightness control.
There is a basic application schematic:
Can anyone find (or have) an actual datasheet for the OZ9976AGN ? I think I can manage without it, but still it would be nice to have.