Conex Club Magazine - no.6 - 2001

Conex Club Magazine - No. 6 - 2001 - LTC 3401 (1A, 3MHz Micropower Synchronous Boost Converter)

Reading time: 3 minute

The main topics presented

1. LT 1930 (Protected High Side MOSFET Driver)

The circuit is a DC / DC converter in SOT-23 capsule with switching frequency of 1.2MHz. The LT1930 circuit is compatible with the LT1613 circuit and can operate with voltages between 2.6V and 16V.

With an input voltage of 5V a voltage of 12V and a current of 300mA. The output voltage can reach 34V.

2. LTC 3401 (1A, 3MHz Micropower Synchronous Boost Converter)

The circuit is a DC / DC converter which can discharge a current of 500mA and a voltage of 3.3V if it is powered by an alkaline battery of only 0.85V.

Working in switching mode at very high frequencies from 300 kHz to 3 MHz achieves 97% efficiency. All components, including the L1 inductor, are in SMD technology.

Built with small dimensions 6 x 12mm and 10 terminals, it has applications in GSP receivers, mobile phones, pager and various measuring devices.

3. Upgrade for the CNX143 kit

The presented material is addressed to those who use the CNX 143 kit (universal plate with 8 triacs), or other similar assemblies for switching resistive loads by means of triacs or thyristors.

The use of the proposed assemblies has the advantage of eliminating disturbances, the decrease of the power dissipated in the grid circuits of the controlled devices, as well as the increase of the reliability of the elements used as load, as an effect of the application of the control at zero voltage crossing.

4. Batteries - Characteristics and ways of efficient charging

Mobile telephony, personal computers, radiocommunications equipment and a multitude of other electronic devices benefit from the electricity supplied by miniature batteries.

They have an important advantage over the primary galvanic elements: the possibility of recharging and therefore of reuse.

Higher initial costs are amortized over time. Unfortunately, not knowing or ignoring some features of these batteries leads us to a less rational use of them.

The article presents some of the features of the most commonly used batteries and some schemes for charging them.

5. Printed circuits - "Corner effect"

The manual or automatic routing of the interconnection routes within the printed circuit boards requires, in an extremely large number of cases, the change of the routing direction.

This change leads to the appearance of a special PCB element, small in size and insignificant at first sight, which under certain conditions can negatively influence the operation of the designed electronic module.

This item is "corner of the interconnection path" or, more simply, the corner. It is introduced to provide greater flexibility in generating the designed layout.

6. The universal programmer "ChipMax"

ChipMax is a high quality device programmer controlled via a parallel interface (present on any IBM compatible PC).

The hardware architecture is present on the board of an FPGA (Field Programmable Gate Array) which ensures a very good speed and allows the programmer to support high density circuits (EPROM, EEPROM, FLASH, PLD and single-chip microcontrollers) in the DIP (Dual In-line Package) capsule without the need for adapters.

7. Electronic car controller

There is a battery charger relay in a modern version. This relay works on charging alternators 12V batteries of the type mounted on Dacia cars.

8. Subtleties in the power floor technique

Usually the electronics of RF assemblies require at least elementary adjustments for tuning. Not infrequently these, being made with great finesse, present performances far below the expected expectations.

The reason: insufficient theoretical knowledge of the practical reality or of some nuances specific to the field. This article comes with the intention of reducing this deficiency.

9. Dynamic light

The assembly has only two output channels (having two switching times), compared to dynamic lights with three, four or ten channels.

Although inferior to complex dynamic lights, the assembly is frequently used both in utility applications (signals, warnings) and in entertainment (in disco bars, amusement parks or light commercials).


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