Tutorial Para Fuentes de Poder Lcd

Power Supply Solutions for small/medium/big size LCD-PDP/TV

Content 

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Classical Approach: 

60W SMPS ( V  i n  I s s  @ V in2 Vin  in2 > V  i n  I pp   @ V in2 Vin 

200W LCD-TV Power Supply: Block Diagram •PFC 200W critical control mode with ZCD function for a costeffective application •Main Converter 200W Flyback  Converter for middle size LCD-PDP/TV application •Standby 10W Flyback  converter with buildin mos mosfe fett PWM PWM controller and circuit to switch off 

Power Supply Unit Vac

EMC filter &Bridge Rectifier

+24V

+12V DC DC conv.

PFC+PWM+Aux L6562+L5991 +L6590

Feedback +5V standby

+5V

200W LCD-TV Power Supply: Specifications Wide Input voltage range: 90-265VAC Multi Output Voltages (Vout): Vout

Current

24V

6A

12V

3A

5V

2A

5Vsb

2A

Remarks 5V output use DC-DC converter which can be put in optional.

Total output Power : 200W

200W LCD-TV Power Supply: Schematic

Advanced PWM Controller L6562+L5991+L6590

L5973D

200W LCD-TV Power Supply: Testing Report Loading efficiency Test Loading

Outputs

24V

12V

5V

5VSB

Full load (FL)

6

3

2

2

Stand by

0

0

0

0.1

No Load

0

0

0

0

Testing result Input voltage

FL Eff.

Input Power Stand by

90V

81.6%

120V

84.3%

220V

86.8%

264V

87.5%

No Load

200W LCD-TV Power Supply

L656 L6 562 2 - Po Powe werr Fa Fact ctor or Co Corr rrec ecto torr • TRANSITION-MODE

• PROPRI PROPRIETAR ETARY Y MULTIP MULTIPLIER LIER DESIGN FOR MINIMUM THD OF AC INPUT CURRENT • LOW (