0920: I'M POWERING AN LM317 WITH 100V... WILL IT EXPLODE? 😱
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In today's episode, I'll discuss the dual power supply presented in video 621, which uses three LM317 regulators and three LM337 regulators connected in parallel to provide an adjustable output voltage and a maximum current of 4A.
During the video, I'll answer three questions:
1) What changes are needed to the circuit to achieve independent output regulation between the positive and negative branches (removing tracking).
2) What is the maximum voltage applicable to the LM317 input?
3) How can I build a linear step-down DC-DC converter that converts an input voltage of up to 100 volts to an output voltage of 30 volts while handling a current of up to 4A?
As always, we start with a theoretical explanation of the circuit diagram and then perform tests to confirm whether the theory matches the practice.
Enjoy!
⏰ Contents:
0:00 Prologue and Initials
1:00 Introduction
3:58 LM317 and LM337 dual power supply circuit diagram
4:58 LM317 output voltage formula
10:30 Assembled circuit board for the 4A version
12:25 Test with voltage tracking
15:50 Modification for independent voltage regulation
17:30 Independent regulation test
18:50 What is the maximum voltage applicable to the LM317?
9:00 PM High-Voltage Power Supply Test for LM317 and LM337
12:50 PM 100V Test for LM317
10:46 PM Linear DCDC Step Down from 100V to 30V
11:00 PM Linear DCDC Step Down Test at No Load
11:00 PM Linear DCDC Step Down Dual Schematic
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