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PBC:
Port Bypass Circuit.
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PCB:
Printed Circuit Board.
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PDIP:
Plastic Dual-Inline Package.
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Photodiode:
A
semiconductor diode that changes its electrical
characteristics in response to illumination.
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Phototransistor:
Is a
semiconductor diode that functions as a
photodetector,
bipolar transistor that is encased in a transparent
case so that light can reach the base-collector
junction.
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PLC:
Programmable Logic Controller. A microprocessor-based
systems which provide factory or plant automation by
monitoring and controlling sensors and actuators in real
time.
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PLCC:
Leaded Chip Carrier, also called PLCC or Plastic Leaded
Chip Carrier: A square surface mount chip package in
plastic with leads (pins) on all four sides
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PNP:
A
bipolar junction transistor having an n-type base
between a p-type emitter and a p-type collector. The
emitter should be positive with respect to the base, and
the collector should be negative with respect to the
base. See
NPN
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P-P:
Peak-to-Peak.
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Pre-Bias Soft Start:
A
power-supply
feature that prevents discharging of the output
capacitor when the power supply starts up. Discharging
the output capacitor could create either start up
oscillation problems at cold start or large voltage
disturbances on the output voltage bus at hot plug-in.
Pre-bias soft start is an important feature in redundant
power-supply systems, parallel power supply modules,
battery back-up voltage buses, and other applications
where multiple power sources supply one node.
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PROM:
("Programmable
ROM"), It’s a user programmable memory, a fuse is
exists for each bit, in order to program the chip, user
have to burn the appropriate bits by using a chip
burner.
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PRT:
Platinum Resistance Thermometer, a resistance
temperature device (RTD).
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PS:
Power Sense.
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PSR:
Power-Supply Rejection.
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PSRR:
Power Supply Rejection Ratio, the ability of an
amplifier to maintain its output voltage as its
power-supply
voltage is varied.
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PSW:
Program Status Word.
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Push-Pull:
An output structure which uses one active device to
source current and a second device to sink current.
Common examples are: a
CMOS stage in which an n-channel device pulls toward
ground or a negative supply and a p-channel device
pushes current to bring the output up; an output stage
in an audio amplifier with an
NPN
and
PNP device in totem-pole configuration.
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PWM:
It is the
modulation of signal
duty cycle. Uses square wave whose
duty cycle is modulated resulting in the variation
of the average value of the waveform.
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