AN826 データシートの表示（PDF） - STMicroelectronics

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AN826

250W HIGH POWER FACTOR SUPPLY FOR TV

STMicroelectronics 

APPLICATION NOTE

Figure 3: TVC Simulation with External Resistive Loads.

CON3

1

+14V

SOUND

OFF

2

-14V

3

10

20W

10

20W

+135V

4

+15V

5

RL 15V

+7.5V

6

SW1

RL 135V

7

ON

SBY

ON

CON2

1

2

3

S-BY

4

D95IN246

RL must be dimensioned according to the required output power

On the evaluated board (refer to CON3 in fig.3)

the adjusted voltage values are:

Voltage at out 1 = +16.5V

Voltage at out 3 = -16.5V

Voltage at out 4 = +13.7V

Voltage at out 1 = +15.7V

Voltage at out 1 = +10V

As the ” stand-by ” output values have been set,

put the switch in ON position The loads are now

connected and all the circuits of the application

run. The TEA5170 is now supplied and it sends

PWM pulses from the secondary to the primary

side of the converter. T2 is turned on, is T1 is cut-

off, thus enabling the L4981A to start. As the

PFC runs, the voltage at the bulk capacitor C23

reaches 400V.

TEST RESULTS:

Output Voltage

Output Power

Efficiency

Power Factor

THD at max. output power:

Power Factor in Stand-by Mode:

THD in Stand-by Mode:

Efficiency at min. Output Power:

Minimum Output Power = 8.5W

4/7

405V (at 230W output power).

10 to 250W

85% (at Max. output power)

0.998

3.5%

0.3

70%

0.5 (Pi min = 17W)

135V ⋅ 18mA + 15V ⋅ 300mA + 7.5V ⋅ 250mA

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