LMT/NOPB Texas Instruments Switching Voltage Regulators 3A STEP- DOWN VLTG REG datasheet, inventory, & pricing. High-Efficiency 3A Battery Chargers Use LM Regulators (Rev. B) · Link · Input and Output Capacitor. LMWU Microchip Technology / Micrel Switching Voltage Regulators 3A Step-Down SMPS Regulator datasheet, inventory, & pricing. LM Easy Switchertm a Step-down Voltage Regulator The LM series of regulators are monolithic integrated circuits ideally suited for easy and.

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Other voltage output base on commercial available resistors. Even with an inductance meter, it is not a easy task to measure inductance accurately. My deduction at that time was either the datasheeg or the capacitor is giving me the problem. A few second after the left circuit is powered up, the small inductor turns very hot.

Perheps the inductor used is not correct. Initially I thought that I had use the wrong type of inductor, resulting in the circuit malfunction. Current drawn can be observe on my lab power supply current meter. A larger and better storage system will be needed. There are also various brand of dc-dc regulator IC available.


Uses readily available standard inductors. The capacitor used is suspected because the datasheet call for low ESR capacitor. There are many illustration which are easy to understand.

LM Datasheet(PDF) – Motorola, Inc

These regulator is able to support up to a maximum of 1A current rating. However it is very big and bulky.

MFR series- High stability metal film resistors offering higher performance than carbon film with very low noise levels and high reliablility. Choose a suitable voltage rating across the capacitor. Realizing that this circuit drive high current load, I should use a thicker inductor coil. Almost similar to MC dc-dc ic. The IC LM from the previous working circuit is then transfer over the new circuit board for testing. The following experiment is done during the 1st test on LM circuit. Features include nickel barriers, wide ohmic range and high reliability.

The output switch includes cycle-by-cycle current limiting, as. Through some research, I get to learn about commercial standard dc-dc IC that perform with only a few external components. Inductance value can be observe immediately for any modification to the coil of wire.

LM2576M1K-5.0 Datasheet PDF

After further testing, I find out that ordinary capacitor works as well. Seems that the circuit can only handle 0.


Typical LED requires about 2V to operate. Fortunately, there is this inductance measurement product selling at an affordable price. I need to check it up. That’s why I modified the circuit with an inductor enamelled wire, wound around the ferrite core. The transistor forms the oscillating circuit generating pulsing output. One using a wire coil inductor, and the other smaller one inductor that looks like a resistor with it’s color bands. This is weird, as the same inductor and capacitor previously tested do not result in this same old problem.

Click the picture to enlarge. It is by far the most compact smaller than SDM and most efficient dc-dc.

The photos on the left column shows the LM circuit using the correct inductance value at uH but the inductor is low power rated. This is the case for Daatasheet too.

LM2576-5.0 Buck Converter overview

To keep sufficient stock for all resistor range is a bit too much to manage. Requiring a minimum number of external components. I am not stopping you to make your own inductor.