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SGS Thomson Microelectronics
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| Part No. |
AN829
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| OCR Text |
...+ 20 full protection one chip l4981a/b controller 4 any compensation 1 d95in252a figure 1: semiconductor kit for pfc schematic. this paper present a new line of p.f.c. dedicated products. both silicon and packaging have been optimized t... |
| Description |
SEMICONDUCTOR KIT FOR POWER FACTOR CORRECTOR
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| File Size |
79.05K /
8 Page |
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SGS Thomson Microelectronics
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| Part No. |
AN628
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| OCR Text |
...ion working at fixed frequency (l4981a), or working in modulated frequency (L4981B) to optimize the size of the input filter. Both devices control the conversion in average current mode PWM to maintain a sinusoidal line current without slop... |
| 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 |
l4981a continuous mode ic introduction reduction of line current harmonic distortion and improvement of power factor is of great concern to many designers of off-line switched mode power supplies. this concern has been moti- vated by presen... |
| 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 |
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SGS Thomson Microelectronics
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| Part No. |
AN828
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| OCR Text |
...pation. the output stage of the l4981a/b is ca- pable of driving directly the module without the aid of a buffer stage. the l4981a controller is supplied by the auxiliary of the boost inductor, a graetz bridge and a simple resistor for th... |
| Description |
1500W-440V POWER FACTOR CORRECTOR PREREGULATOR
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| File Size |
46.38K /
3 Page |
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it Online |
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SGS Thomson Microelectronics
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| Part No. |
AN826
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| OCR Text |
...ure of the system consists of a l4981a controller with the relevant circuitry for the pfc section, and of a tea2261 synchro- nised, in master-slave configuration, with a tea5170 at 15 khz switching frequency. when the supply is in stand-by ... |
| Description |
250W HIGH POWER FACTOR SUPPLY FOR TV
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| File Size |
300.60K /
7 Page |
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it Online |
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SGS Thomson Microelectronics
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| Part No. |
AN1060
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| OCR Text |
...5991a uc3843a/b or uc3845a/b or l4981a l4955v5.1 100 m f 13 2 transformer specs: core: e20x10x6, 3c85 material or equivalent 0.5 mm air gap for a primary inductance of 1.7 mh n1: 2 series windings 66 t each, awg32 ( ? 0.24 mm) n2: 11 t, aw... |
| Description |
FLYBACK CONVERTERS WITH THE L6561 PFC CONTROLLER
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| File Size |
93.36K /
11 Page |
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SGS Thomson Microelectronics
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| Part No. |
AN825
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| OCR Text |
...100V
15 16
Q1 STP60N06
l4981a
1 10 6
C2 3300F 63V EYF ROE
8
2
5 R21 5.1K 1% C3
9
18
17
12
11
7 R2 13K 1% R10 13k 1%
220pF
R21 5.1K 1% R8 4.7K 5% R11 390 5% R4 4.7K 5% C4 1nF R16 24K 1% C6 1F 1... |
| Description |
PFC APPLICATION IDEAS USING MAINS TRANSFORMER
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| File Size |
77.41K /
7 Page |
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it Online |
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SGS Thomson Microelectronics
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| Part No. |
AN966
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| OCR Text |
...phisticated controller ic (st's l4981a, with the vari- ant of the frequency modulation offered by the l4981b) and a considerable component count. the sec- ond one requires a simpler control (implemented by st's l6561), much fewer external p... |
| Description |
L6561, ENHANCED TRANSITION MODE POWER FACTOR CORRECTOR
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| File Size |
167.32K /
20 Page |
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it Online |
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