Difference between revisions of "H745 -15V Regulator"
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| + | * [http://www.bitsavers.org/pdf/dec/pdp11/1140/1140_SystemManual.pdf PDP-11/40, -11/35 (21 inch chassis) system manual] (EK-11040-TM-002)- the H745 is covered in Section 6.4.4 (pp. 114-115 of the scanned version) | ||
| + | * [http://www.bitsavers.org/pdf/dec/pdp11/1140/PDP-1140_System_Engr_Drawings_Rev_P_Jun74.pdf PDP-11/40 system engineering drawings] - the H745 is covered on pp. 209-208 of the scanned version | ||
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| + | [[Category: DEC Power Supplies]] | ||
Latest revision as of 17:29, 10 July 2023
The H745 -15V Regulator is one of the DEC standard modular regulators. It can produce an output current of up to 10A at an output voltage of -15V. It has over-current and over-voltage detection and protection.
It was a switching power supply, one of the earliest; however, the basic concept was somewhat different from later supplies of this type. It takes as input AC at a voltage of 20V-30V, runs it through a diode bridge and filter capacitor to convert it to DC. That is then run through a large transistor controlled by a monolithic integrated circuit voltage regulator and an inductor to do VI conversion using a buck converter, to produce the output.
It took its AC input on pins 6 and 8, and it also used +15V input on pins 4 and 5 (why two pins is unclear, since the +15V supply was of limited current); the 15V output was on pin 1, and the ground return on pins 2 and 3. Pin 7 was not connected.
External links
- PDP-11/40, -11/35 (21 inch chassis) system manual (EK-11040-TM-002)- the H745 is covered in Section 6.4.4 (pp. 114-115 of the scanned version)
- PDP-11/40 system engineering drawings - the H745 is covered on pp. 209-208 of the scanned version
