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SGS Thomson Microelectronics
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| Part No. |
AN829
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| OCR Text |
...emiconductor kit consists of an l4981 con- troller, an ste36n50-dk power module and an sth80n05 power sense (see figure 1). l4981a/b controller: the l4981 operates with an input voltage range of 85v to 270v and uses average current mode pwm... |
| Description |
SEMICONDUCTOR KIT FOR POWER FACTOR CORRECTOR
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| File Size |
79.05K /
8 Page |
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it Online |
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SGS Thomson Microelectronics
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| Part No. |
AN628
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| OCR Text |
l4981 CONTINUOUS MODE
by Ugo Moriconi
INTRODUCTION
Conventional AC-DC converters usually employ a full wave rectifier bridge with a simple capacitor filter to draw power from the AC line. This "bulk" capacitor must be big enough to sup... |
| Description |
DESIGNING A HIGH POWER FACTOR SWITCHING PREREGULATOR WITH THE l4981 CONTINUOUS MODE
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| File Size |
306.04K /
35 Page |
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it Online |
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SGS Thomson Microelectronics
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| Part No. |
AN827
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| OCR Text |
...switching preregulator with the l4981 continuous mode [1] and the corresponding datasheet l4981a/b power factor corrector [2]. power components selection the power component values and types are de- rived and selected in the next section. p... |
| Description |
A 500W HIGH POWER FACTOR WITH THE l4981A CONTINUES MODE IC
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| File Size |
305.63K /
16 Page |
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it Online |
Download Datasheet |
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SGS Thomson Microelectronics
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| Part No. |
AN828
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| OCR Text |
... using the "a" ver- sion of the l4981 controller, without using addi- tional features obtaining high performance re- sults, in terms of efficiency and harmonic content. further improvements are possible using the ad- ditional features of t... |
| Description |
1500W-440V POWER FACTOR CORRECTOR PREREGULATOR
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| File Size |
46.38K /
3 Page |
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it Online |
Download Datasheet |
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SGS Thomson Microelectronics
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| Part No. |
AN826
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| OCR Text |
...unding c9 (at soft start pin of l4981) and so the pfc section is not working. it is possible to test the voltage at the output of the step-up (pfc) section c23. it must be about 308 v (depending on the mains volt- age). the outputs of the c... |
| Description |
250W HIGH POWER FACTOR SUPPLY FOR TV
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| File Size |
300.60K /
7 Page |
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it Online |
Download Datasheet |
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SGS Thomson Microelectronics
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| Part No. |
AN825
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| OCR Text |
...TOR SWITCHING PREREGULATOR WITH l4981 CONTINUOUS MODE . The topology is the standard boost type, using low voltage discrete components, power MOS and freewheeling diode. Considering the max. operating input voltage of the L4970A/77A of 50V,... |
| Description |
PFC APPLICATION IDEAS USING MAINS TRANSFORMER
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| File Size |
77.41K /
7 Page |
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it Online |
Download Datasheet |
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