Re: Adapting this NSC app note for my +150V regulator



Winfield Hill wrote:


A p-channel part here, awkward, not quite
my cup of tea, I'm afraind.

An obvious candidate would be like so. Nothing shows up in simulation but there's something about it that disrupts LM317 stability, too much gain at current limit:
View in a fixed-width font such as Courier.

.
.
. V+
. | 1N4004
. .----+-------|<|----------------------.
. | | |
. |2W | |
. [100k] | |
. | | |
. | | |
. | | |
. | | \ |
. +----|--------------+------|<|--------+
. | | | 9.1V |
. | | | |
. | |-' | |
. '--| NCH |/ |
. |> .------| |
. | | |> LM317 |
. | | | --------- |
. | | | | | |
. '-----+-[7.5]--+---|Vin Vout|---+- - -
. | | |
. | Adj | [150]
. --------- |
. | |
. '--------+
. |
.
.
.

There's no problem with this wasteful thing though:
View in a fixed-width font such as Courier.

.
.
. V+
. | 1N4004
. .----+-------|<|----------------------.
. | | |
. |2W | |
. [100k] | |
. | | |
. | | |
. | | .---. |
. | | | | |
. | | | |-' |
. +------------+-| NCH |
. | | |> |
. | | | \ |
. | | '---------|<|--------+
. | | 5.6V |
. | | 1N4734 |
. | |-' |
. '--| NCH |
. |> |
. | LM317 |
. | --------- |
. | | | |
. '-------[47]-------|Vin Vout|---+- -
. | | |
. | Adj | [150]
. --------- |
. | |
. '--------+
. |
.
.
.
.

.

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