FACT SHEET Horizontal Deflection 17", Monitors Using Philips

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FACT SHEET Horizontal Deflection 17", Monitors Using Philips

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PHILIPS DISCRETE SEMICONDUCTORS
FACT SHEET
Horizontal Deflection 17", Monitors
Using Philips CU15/35 drive transformer BU4522AF/AX transistor
Most monitor designs pc's required operate frequencies kHz; this Fact Sheet describes Philips Components Semiconductors solution horizontal deflection circuit. This circuit uses CU15/35 drive transformer from Philips Components BU4522AF/AX deflection transistor from Philips Semiconductors. This circuit employs drive transformer designed specifically optimum switching Philips deflection transistors multi-frequency monitor applications. circuit complete solution horizontal output stage: `Hdrive' point attached output most deflection/sync ic's. concepts employed this circuit discussed detail technical paper "Low power, cost horizontal drive circuits with core" (ETV/AN97002).
Hdrive
Fig. Horizontal Deflection Circuit 17", Monitors
Components values: 1N4148; 18V; 1N4148; BZX79C6V8; NFR25; Philips BC337A; Philips CU15/35; Philips BU4522AF/AX; BYV28-50; Philips BY359X-1500S;
(1A/div) (10V/div)
BC337A
IB(end) 1.15 1.25 -3.0 IB(off) -4.2 ICmax kHz; VCEmax 1200 Table Operating Conditions
time (2us/div)
Fig. BC337A time
(5V/div) (1A/div)
BU4522AF/AX
Figs. show important waveforms horizontal deflection circuit. base drive current been optimised, this example, application running with duty cycle drive, peak peak 1350 operating conditions summarised Table above. circuit will also work lower frequency modes required. drive duty cycle small change necessary, achieved altering only. applications with operating conditions different those detailed above Table below details actions taken:
Condition
ICmax 5.5A
time (2us/div)
Action
BU4515AF/AX BU4523AF/AX BU4523AF/AX
ICmax 6.5A
Fig. BU4522AF/AX time
Table Actions Different Operating Conditions
(1A/div) (200V/div)
BU4522AF/AX
change transistor type requires change value resistors only. This circuit employs some concepts which have very important benefits monitor design: total dissipation, `Green' design. component count.
voltage, cost components. Flexible design, easy change designs.
time (2us/div)
Fig. BU4522AF/AX time
Reliable design fault transient conditions. concepts this circuit easily applied other multi-frequency monitor design.
more information contact: Philips Semiconductors Bramhall Moor Lane, Hazel Grove Stockport, Cheshire, 5BJ, U.K. Tel. Telefax 0011 0015
Philips Electronics N.V. 1998 rights reserved. Reproduction whole part prohibited without prior consent copyright owner. information presented this document does form part quotation contract, believed accurate reliable changed without notice. liability will accepted consequence use. Publication thereof does convey imply license under patent other industrial intellectual property rights. Prepared PSAL 3-'98 9397 01391

FACT SHEET Horizontal Deflection 17", Monitors Using Philips

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