Difference between revisions of "H744 +5V Regulator"
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| − | The '''H744 +5V Regulator''' is one of the [[DEC standard modular regulator]]s. 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. | + | The '''H744 +5V Regulator''' is one of the [[DEC standard modular regulator]]s. 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 quite different from later supplies of this type, as it was still quite low efficiency. | It was a [[switching power supply]], one of the earliest; however, the basic concept was quite different from later supplies of this type, as it was still quite low efficiency. | ||
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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 several large [[transistor]]s controlled by a monolithic [[integrated circuit]] [[voltage regulator]] to produce the output. | 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 several large [[transistor]]s controlled by a monolithic [[integrated circuit]] [[voltage regulator]] to 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 utiliy of the third +5V pin was - perhaps it allowed machines to differentiate between H744's and H7441's? | |
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[[Category: DEC Hardware]] | [[Category: DEC Hardware]] | ||
Revision as of 15:06, 21 September 2018
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 quite different from later supplies of this type, as it was still quite low efficiency.
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 several large transistors controlled by a monolithic integrated circuit voltage regulator to 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 utiliy of the third +5V pin was - perhaps it allowed machines to differentiate between H744's and H7441's?
