H745 -15V Regulator - Revision history

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The '''H745 -15V Regulator''' is one of the [[DEC standard modular regulator]]s. 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 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 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.

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[[Category: DEC Hardware]]

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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]]

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-The '''H745 -15V Regulator''' is one of the [[DEC standard modular regulator]]s. 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.
+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 [[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]] 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.

← Older revision		Revision as of 13:59, 21 September 2018
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	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.		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.
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	[[Category: DEC Hardware]]		[[Category: DEC Hardware]]