DATASHEET and Circuit Diagram

The schematic herein diagrams a very high voltage, high current booster which allows an op amp to control up to 300W positive outputs up to a staggering 1000V. The high voltage is generated by a switching DC-DC converter which forms an integral part of the booster. This circuit operates in a switching mode performance.

This so called ‘Son of Godzilla Booster’ using LM3524 switching regulator chip to pulse width modulate the transistors which provide switched 20 kHz drive to the  step-up transformer. The transformer’s output is fed back to the LF411 op amp which controls the input to the LM3524 switching regulator.

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The schematic shows you with the Simplified Half-Bridge Output Inverter Circuit. The circuit diagram is called to be Full-Bridge simplification since the number of equivalent Insulated-Gate Bipolar Transistor (IGBTs) is now a half even the number of diodes in the output rectifier is doubled.

When one of IGBTs is in ON, the other is OFF. During the positive half wave, X1 is ON and X2 is OFF so that DA and DB work as output rectifier while DC & DD are OFF and vice versa.

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If you need a bipolar NPN transistor with dynamic characteristics and lot to lot minimum spread for your light ballast applications, you may consider the BUD42D 4A, 650V, 25W Power Transistor. The schematic below is the typical inductive load switching drive circuit diagram of the BUD42D.

The device has features such free wheeling diode built in, flat DC current gain, antisaturation network, transient voltage suppression capability, and “6 Sigma” Process Providing Tight and Reproducible Parameter Spreads.

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The following DC power supply (PSU) is designed for the ham radio transceivers. It such a regulated DC power supply with short circuit safe and current limiter. This PSU can deliver 20Amps at 13.8V using a simple 12V regulator of the IC7812.

This power supply circuit was built with semiconductors as follows: transistors (BC 557B, BD330, 2N5683, BC547), 7812 IC Regulator, various resistors, capacitors (40.000uF, 33nF, 1uF Tantal, 100nF) and etc.

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The following semiconductor article provide you with information about basic and simple power supply regulators, a few basic circuit in understanding on how some of the more sophisticated power supplies circuit operated such as the 7800/7900 series, and the LM723.

You will be taken into explanation about why using a regulator in a power supply circuitry, the principle of short-circuit device for maintaining circuit continuity, switching type regulators and electromechanical regulators, and explanation about several simple regulator circuit such basic shunt regulator, simple regulator for higher current, simple adjustable regulator, feedback regulator with single transistor error amplifier, feedback regulator with current limiting (click to enlarge), the use of op amp as error amplifier, transistor current regulator, the use of LM7805 as current regulator, and the use of LM723C regulator with bypass resistor.

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If you have such difficulties in reading a datasheet, you may read the following article contain information about how to read a datasheet. There could be a lot of information, that might confuse you a little but a datasheet tells you everything you need to know about semiconductor device i.e ICs, transistors, diodes, and etc.

Commonly, a datasheet is the document telling you the typical device performance, minimum/maximum requirements and characteristics of the device so that not to harm the device when we use it, and also any suggested and hints for helping you to work with the device. But, you don’t have to understand everything in a datasheet. And in the this article you will be explained with an example of a datasheet regarding how to read and understand the materials within it.

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