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Serial Number Prefixes 2403A-3001A
from AlA Rectifier to provide regulated outputs of +lOO V and +5.2 V.
Q7 and associated circuitry form a current source of approximately 3 mA from the
unregulated +118 V supply. Under active conditions, this current drives QS on until amplifier
U2 senses an equal voltage condition between the voltage reference (divider resistors R8 and
condition by shunting current through Q4.
The +lOO V regulator circuit is shut down by PWR DWN going high, turning on Q2, which
shunts the source current to ground.
The +5.2 V Regulator is similar to the -15 V Regulator in the AlA f15 V Regulator. It is
referenced to the +15 V supply and has overvoltage and current limiting circuits similar to
those in the -15 V Regulator.
Serial Number Prefixes 3001A and Above
The AlA +lOO V, +5.2 V Regulator (HP Part Number 85662-60235) is actually a +120 V,
from AlA Rectifier to provide regulated outputs of +120 V and +5.2 V.
Q7 and associated circuitry form a current source of approximately 3 mA from the
unregulated +140 V supply. Under active conditions, this current drives QS on until amplifier
U2 senses an equal voltage condition between the voltage reference (divider resistors R8 and
condition by shunting current through Q4.
This regulator circuit is shut down by PWR DWN going high, turning on Q2, which shunts
the source current to ground.
CR5 is part of the overvoltage clamp. CR5 in combination with CR4 will clamp the
Regulated output at +129 V.
The +5.2 V Regulator is similar to the -15 V Regulator in the AlA f15 V Regulator. It is
referenced to the +15 V supply and has overvoltage and current limiting circuits similar to
those in the -15 V Regulator.
6 AlA6/AlA7
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