Difference between revisions of "H744 +5V Regulator"
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The '''H744 +5V Regulator''' is one of the [[DEC standard modular regulators]]. It can produce an output [[current]] of up to 25A at an output [[voltage]] of +5V; the later (short-lived and rare) '''H7440 +5V Regulator''' could also produce up to 25A, and the replacement '''H7441 +5V Regulator''' up to 32A. All had over-current and over-voltage detection and protection. | The '''H744 +5V Regulator''' is one of the [[DEC standard modular regulators]]. It can produce an output [[current]] of up to 25A at an output [[voltage]] of +5V; the later (short-lived and rare) '''H7440 +5V Regulator''' could also produce up to 25A, and the replacement '''H7441 +5V Regulator''' up to 32A. All had 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 [[alternating current|AC]] at a [[voltage]] of 20V-30V, runs it through a [[diode]] bridge and filter [[capacitor]] to convert it to [[direct current|DC]]. That is then run through a large [[transistor]] | + | 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 [[alternating current|AC]] at a [[voltage]] of 20V-30V, runs it through a [[diode]] bridge and filter [[capacitor]] to convert it to [[direct current|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]], and produce the output. |
| − | The H744 and H7440 took their AC input on pins 6 and 7; the +5V output was on pins 2 and 5, and the [[ground return]] on pins 3 and 4; pins 1 and 8 were not used. In the H7441, pin 1 was also used for +5V output; the other pins were the same. Since it retained the use of only two pins for ground return, it's not clear what the | + | The H744 and H7440 took their AC input on pins 6 and 7; the +5V output was on pins 2 and 5, and the [[ground return]] on pins 3 and 4; pins 1 and 8 were not used. In the H7441, pin 1 was also used for +5V output; the other pins were the same. Since it retained the use of only two pins for ground return, it's not clear what the utility of the third +5V pin was - perhaps it allowed machines to differentiate between H744's and H7441's? |
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| − | [[Category: DEC | + | ==External links== |
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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 H744 is covered in Section 6.4.3 (pp. 112-114 of the scanned version) | ||
| + | * [http://www.bitsavers.org/pdf/dec/pdp11/1160/EK-11060-SV-01_1160cab_Feb78.pdf PDP-11/60 cabinet and power supply manual] - the H7440 is covered in Section 3.3.2 (pp. 49-53 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 H744 is covered on pp. 205-208 of the scanned version | ||
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| + | [[Category: DEC Power Supplies]] | ||
Latest revision as of 16:24, 10 July 2023
The H744 +5V Regulator is one of the DEC standard modular regulators. It can produce an output current of up to 25A at an output voltage of +5V; the later (short-lived and rare) H7440 +5V Regulator could also produce up to 25A, and the replacement H7441 +5V Regulator up to 32A. All had 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, and produce the output.
The H744 and H7440 took their AC input on pins 6 and 7; the +5V output was on pins 2 and 5, and the ground return on pins 3 and 4; pins 1 and 8 were not used. In the H7441, pin 1 was also used for +5V output; the other pins were the same. Since it retained the use of only two pins for ground return, it's not clear what the utility of the third +5V pin was - perhaps it allowed machines to differentiate between H744's and H7441's?
External links
- PDP-11/40, -11/35 (21 inch chassis) system manual (EK-11040-TM-002)- the H744 is covered in Section 6.4.3 (pp. 112-114 of the scanned version)
- PDP-11/60 cabinet and power supply manual - the H7440 is covered in Section 3.3.2 (pp. 49-53 of the scanned version)
- PDP-11/40 system engineering drawings - the H744 is covered on pp. 205-208 of the scanned version
