- AN21 Bipolar transistor considerations for battery powered equipment - leading to efficiency and competitive advantages in portable systems.
Bipolar products provide many performance advantages in modern battery powered systems. This note reviews the parametric and circuit related characteristics of high performance bipolar devices and MOSFETs, and provides some application examples in which the bipolar option gives the most credible solution.
- AN22 High frequency DC-DC conversion using high current bipolar transistors - conversion upto 400kHz using optimised geometry bipolar devices.
A discussion of the switching capabilities of bipolar transistors, including charge analysis and circuit techniques to permit high frequency saturated switching. Circuit examples are presented to illustrate speed-up methods, and charts to demonstrate the resultant efficiency improvements. The report also includes turn-off charge versus bias point characterisation charts, for typical high current low VCE(sat) bipolar devices, targeted for low voltage and battery applications.
- AN23 Zetex SPICE models - understanding model parameters and applications limitations.
This report describes the basic Gummel-Poon model as used as a basis for analog circuit simulations. An overview of the model parameters and their derivation, as well as guidelines for model manipulation for specific cases are also included. A number of typical application circuits are suggested with the resultant SPICE predictions of operation.
- AN24 An introduction to the SM-8 package.
The SM-8 is an eight leaded version of the industry standard SOT223 transistor package. Using a number of leadframe options allows the assembly of dual transistors, dual ICs and hybrid combinations. This report provides an introduction to package attributes and includes example applications that benefit.
- AN25 With the introduction of lead free products AN25 has been superceded.
More information about soldering surface mount devices can be found here. More information.
PC board assembly with surface mount components requires due consideration of solder behaviour, thermal limitations of the devices concerned, and mechanical attach integrity. This note provides a brief overview of the pertinent factors, and suggests maximum temperatures and soldering profiles.
With the introduction of lead free products AN25 has been superceded.
More information about soldering surface mount devices can be found here. More information.
- AN26 Fast charging batteries with Zetex high current PNP transistors and benchmark controller ICs.
High current, fast switching PNP transistors are capable of replacing large packaged P-Channel MOSFETs, when attention is paid to the base drive requirements. This enables space and performance efficient designs at much reduced cost.
- AN27 ZR431 application note.
An introduction to some of the many applications of the versatile ZR431 shunt regulator. Particular emphasis is given to the advantages apparent when employing the Zetex version of this popular part.
- AN28 The ZLDO series of low dropout voltage regulators.
The ZLDO series of regulators provide the lowest dropout voltage currently available in their class. Application examples covering dropout and other important features of the series are discussed.
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