H744 +5V Regulator - Revision history

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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.

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 [[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 took its 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.

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[[Category: DEC Hardware]]

← Older revision		Revision as of 15:24, 10 July 2023
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−	[[Category: DEC ~~Electrical~~]]	+	==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]]

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 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 utiliy of the third +5V pin was - perhaps it allowed machines to differentiate between H744's and H7441's?
+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?
 {{semi-stub}}
-[[Category: DEC Hardware]]
+[[Category: DEC Electrical]]

@@ Line 1: / Line 1: @@
 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]]s controlled by a monolithic [[integrated circuit]] [[voltage regulator]] and an [[inductor]] to do [[VI conversion]] using a [[buck converter]], and produce the output.
+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 utiliy of the third +5V pin was - perhaps it allowed machines to differentiate between H744's and H7441's?

@@ Line 1: / Line 1: @@
-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.
+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 several large [[transistor]]s controlled by a monolithic [[integrated circuit]] [[voltage regulator]] and an [[inductor]] to produce the output.
+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]]s 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 utiliy of the third +5V pin was - perhaps it allowed machines to differentiate between H744's and H7441's?

@@ Line 1: / Line 1: @@
 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 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 several large [[transistor]]s and an [[inductor]] controlled by a monolithic [[integrated circuit]] [[voltage regulator]] to produce the output.
+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 several large [[transistor]]s controlled by a monolithic [[integrated circuit]] [[voltage regulator]] and an [[inductor]] 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?
 [[Category: DEC Hardware]]