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Device Simulation a Step Closer to Real Life - Spice Models Offer Additional Thermal Characteristics

Spice

Software tools like Spice are widely used in electronics design and useful for simulation and optimization of circuits. Often the theoretical behaviour is, however, not matching to the later on real life testing, which requires in worst case a time consuming re-design. One reason for such mismatch is the lack of comprehensive thermal characteristics in Spice models, as offered by many suppliers. While e. g. the temperature behaviour of forward voltage and reverse leakage of semiconductor diodes are part of almost every Spice model, it is seldom provided for the voltage drift of Zener and TVS diodes, or the presumed constant current of CLDs (Current Limiting Diodes). And exactly that can cause an issue, when later the device is operated in the real circuit and gets unavoidable warm under load.

The Spice models provided by Diotec for its Zener and TVS diodes, CLDs but of course also all rectifiers are made with additional temperature characterisation.

Provided that Spice simulation is done with different temperature presettings, one can see the behaviour under real junction conditions and can adjust the circuit where necessary. The picture shows as an example the temperature behaviour of an uncompensated and a compensated CLD.

Spice models for Diotec products are accessible via www.diotec.com using simply the part search function.
Here just three examples for your testing:

ZMY18 [https://diotec.com/tl_files/diotec/files/spice/zmy18.zip]
P4SMAJ30A [https://diotec.com/tl_files/diotec/files/spice/p4smaj30a.zip]
CL10MD [https://diotec.com/tl_files/diotec/files/spice/cl10md.zip]

LDI812C-3.3SFA: Ultra Low Power LDO - For High Accuracy and Performance in Low-power Electronic Devices

LDI812C-3.3SFA

The Internet of Things is constantly evolving all around the world. Many of these devices are compact, wearable, battery powered or integrated into consumer and industrial electronics. Minimizing the battery discharge is an essential need for keeping these electronic gadgets work for long durations. It requires LDOs with very low quiescent currents, for minimizing power consumption during stand by mode.

The LDI812C-3.3SFA from Diotec is a CMOS based high voltage low-dropout positive voltage regulator, specifically designed for low-power electronics and battery operated systems where power savings are decisive. This device can be operated at a wide range of input voltage up to 16 V. It features a fixed output voltage of 3.3 V and output current rating of 50 mA. Dropout voltage is as low as 230 mV and quiescent current ultra-low at typically 1 µA.

The device facilitates minimal board space due to its small outline dimensions and a potentially smaller output ceramic capacitor of 1.0 µF.

 

Features

  • CMOS Based Voltage Regulator
  • Low Dropout of typically 230 mV
  • Quiescent Current typically 1.0 µA
  • Narrow Tolerance ± 2 %
  • Low Power Consumption

Applications

  • Internet of Things
  • Portable & Battery Powered Devices
  • Communication Devices

 

TVS Diodes for Almost All Kind of Applications - High Performance Protection for Green and Sustainable Technologies

TVS diodes

To design sustainable or "green" technologies means also to ensure longest possible lifetimes of electronic devices, once they are produced. An important item is here the protection against transient voltage peaks, as they occur on the power grid in case of lightning strikes. Transient Voltage Suppressors (TVS) prevent high voltage surges from damaging sensitive electronic circuits. Diotec offers TVS Diodes for almost all kind of applications, and from low up to very high voltage levels. Check out our latest Application Note to find the optimal TVS solution for your project.

Application Note TVS Diodes

1.35 A Low-Dropout Positive Voltage Regulators: High efficiency. Small size.

LDO

The LDI1117 series by Diotec are positive linear voltage regulators with low dropout and output currents of up to 1.35 A. They offer a typical voltage drop of 1.15 V at 1 A and can be operated at up to 20 V of input voltage (maximum rating).

Parts are available with adjustable output voltage, ranging from 1.25 V to 13.65 V and set-up by just two additional resistors. Further available are versions offering a fixed output voltage of 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V or 5.0 V.

All versions feature integrated current limiting and thermal shut-down circuits, which prevent damage in case of overload conditions. Furthermore, its internal circuitry comprises of trimmed bandgap reference, ensuring the tight output voltage accuracy of 1% tolerance. Adding of 22 pF at the output is recommended to attenuate transient response and ensure stability.

They are offered in low profile and space saving packages like SOT-223, SO-8 and SOT-89. All these packages are totally lead-free and in full compliance to ROHS and REACH without any exemptions.

Features

  • Low dropout: Typ. 1.15 V
  • Narrow Tolerance
  • Current Limiting & Thermal Overload Protection
  • Totally lead-free devices

 

Applications

  • Post regulators for switch mode power supplies
  • Battery Chargers
  • USB devices
  • Active SCSI termination regulator

Polarity Protection for Sensitive Automotive Electronics - Three common solutions and its benefits and drawbacks

Reverse Polarity Protection

Automotive electronic circuits must be protected against reverse polarity. Such events may occur e. g. during service time or jump-starts of the vehicle. For this purpose, hardware designers must take appropriate measures to keep automotive electronics unharmed after a reverse polarity event.
Diotec offers a wide range of AEC-Q101 qualified parts to avoid negative current flow. Our Application Note describes three of the most common solutions for reverse polarity protection, including benefits and drawbacks as well as recommended components.

 

Bidirectional Zener Diode in Single Package Outline: Two-in-one solution offers cost reduction and board space savings

MM3BZ18

The MM3BZ18 from Diotec combines two opposing 18 V Zener diodes on a single chip. It comes in the tiny SMD outline SOD-323, measuring only 2.5 mm x 1.25 mm and featuring a low profile height of just 1 mm. As such, it is ideally suited for very compact electronic assemblies.

Forming a bidirectional Zener diode, this part allows for positive and negative voltage clipping by just one component. It offers a sharp Zener voltage breakdown of nominal 18 V at 1 mA, a very low leakage current of less than 100 nA at 13 V and up to 200 mW of steady-state power dissipation.

Such device is ideally suited for AC voltage clipping circuits in motor control of brushless power tools, wide range input stages, smart home and IoT applications and further more. The two-in-one configuration enables design engineers to reduce component count, which not only saves board space but also costs for material and assembly.

 

Features

  • Bidirectional configuration
  • Low leakage current
  • Board space savings
  • Cost reductions

 

Applications

  • Voltage Clipping Circuits
  • Wide Range Input Stages
  • Control of Brushless Power Tools
  • Offline Battery Chargers
  • Smart Home and IoT Applications

Application Note Reverse Polarity Protection

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