LM2575 is a 5-lead switching regulator and requires large inductors/caps
to operate - seen on the 5494 Twinax adapter. Both the short 5250
adapter and the long S36/38 Workstation adapter use a 3-lead linear
regulator (judging based on the photos). @David - can we get the part
number?
On 4.11.2021 11:21, Tomas Slavotinek wrote:
On 3.11.2021 19:27, Louis Ohland wrote:
Looking at some 4224 Twinax cards and 5250 adapters and the 5494
Twinax adapter, they all use the LM2575T -5.0 voltage regulator.
https://datasheet.octopart.com/LM2575T-5.0-NOPB-Texas-Instruments-datasheet-8191682.pdf
For the interface chip most likely...
You won't find the regulator on the ISA cards as these can take the
voltage directly from the bus connector/main power supply. MCA machines dropped the -5V PSU rail, so a local source is necessary.
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