RS485 transceivers do not require terminating resistors. Free Technical Library News

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RS485 transceivers do not require terminating resistors

22.06.2006

Linear Technology introduced two new ICs: LTC2859 and LTC2861, which are half-duplex and full-duplex RS485 transceivers, their distinctive feature is the presence of a built-in plug-in terminating resistor.

Traditionally, when creating networks based on the RS485 protocol, the user had to independently install 120 ohm terminating resistors. Their installation locations were determined depending on the topology of the connecting lines and the location of the network nodes. As the network expanded, the user had to install additional terminating resistors.

The control program has the ability to connect terminating resistors in the LTS2859/LTS2861 transceivers, while ensuring matching for the required number of network nodes - without any physical participation from the user.

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ICL5102 - Efficient half-bridge AC-DC converter controller with PFC 27.08.2018

Infineon's ICL5102 is a new combined power supply controller that controls two stages at once: a power factor corrector (PFC) stage and a resonant half-bridge LLC converter stage (optionally LCC).

The high level of integration of this solution ensures a low number of components and is well suited for compact and low profile power supplies. The configuration of the parameters of the ICL5102 chip is made by selecting the resistor values. With a starting current of about 100 μA, the controller allows you to start the power supply in no more than 300 ms.

The PFC stage is implemented on the basis of a digital core and operates in the choke current limit (CrM) mode or switches to discontinuous current mode (DCM) at light load. This stage operates in the frequency range from 22 to 500 kHz and allows you to achieve a power factor of more than 95% and an input current harmonic distortion (THD) of less than 10%.

The half-bridge stage contains a built-in low and high side driver for controlling an external transistor with a maximum voltage of up to 650 V. This microcircuit implements an adaptive dead time adjustment algorithm in the range of 500-1000 ns.

The ICL5102 controller implements an algorithm for exiting the capacitive operation mode of the LLC converter. The capacitive mode can occur either with a short circuit in the load, or with a sharp increase in load (surge) or when starting the converter. The controller attempts to smoothly bring the converter out of capacitive mode by increasing the conversion frequency. If this does not help, then the controller is restarted.

Technical advantages:

Range of effective values of input voltages 85...305 V;
The operating frequency range of the PFC cascade is 22...500 kHz;
Built-in isolated coreless transformer technology high-side driver of the output stage;
High converter efficiency up to 95% is possible (both stages - KKM + LLC);
External NTC resistor for overheating protection;
Short soft start time up to 300 ms;
Algorithm of regulation in the capacitive mode of the LLC-cascade;
Run at 1,3 MHz;
Stable operation under light load;
Housing DSO-16;
Operating temperature range -40...125°C.

Typical applications:

Industrial power supplies;
Power supplies for consumer electronics;
LED drivers.

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