Figure 5-47. 12-Volt Regulator Card, 12-Volt Regulator Circuit

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

Figure 5-47. 12-Volt Regulator Card, 12-Volt Regulator Circuit - Block Diagram

A decrease in voltage to the error amplifier causes a less

increased energy requirements. In turn, a decrease in

positive threshold voltage to be applied to the high-speed

current requirements require a narrower pulsewidth to

comparator. At the same time, drive current from the

provide the less energy requirements. The pulse output

switch drivers is applied through the current feedback

from the one-shot multivibrator is amplified through the

transformer as a dc ramp (sawtooth) voltage to a second

pulse amplifier as the Q1 drive pulses that are applied to

the 12-volt driver card.

input on the high-speed comparator.

When the

amplitude of the dc ramp voltage reaches the threshold

5-628. The drive pulses from the 12volt regulator

level applied from the error amplifier a control pulse is

generated to turn or. switch Q8. In turn, switch Q8

circuit are applied through the 12-volt driver card (A2) to

resets a one-shot multivibrator when it is turned on. The

drive the 12-volt switches. Each time the switches are

one-shot multivibrator is triggered on by the B clock

pulsed, energy is coupled through a transformer to the

signal from the clock generator. The time that the

12-volt rectifier circuits that produce a dc input to the

multivibrator is allowed to conduct determines the width

12-volt filter circuit. The outputs from the filter circuit

of the drive pulses generated by the pulse amplifier. The

are the +12V Reg and -12V Reg outputs that are applied

conduction time of the multivibrator is determined when

to power the logic circuits in the multiplexer set.

switch Q8 is turned on. Figure 5-48 shows that a narrow

pulsewidth is used to decrease the output voltage level

5-629. The +5-volt regulator card contains four identical

and a wider pulsewidth is required to increase the output

regulator circuits that are operated in parallel to generate

voltage level. Normally, a decrease in the output voltage

the drive pulses for the four sets of switches.

level indicates an increased current power requirement.

Therefore, a wider pulsewidth is required to provide the

5-171