AN1376 datasheet(6/35 Pages) STMICROELECTRONICS

6 / 35 page

AN1376 APPLICATION NOTE

6/35

The maximum PIV of the diodes has been measured during the worst operating condition and

it is indicated on the right of each picture. The margin, with respect to the maximum voltage

sustained by the diodes, assures a safe operating condition for the devices.

Here following the most salient controller IC signals are depicted. In both the pictures is pos-

sible to distinguish clean waveforms free of hard spikes or noise that could affect the controller

correct operation.

Figure 5. Vin = 115 Vrms - 50 Hz

Vin = 220 Vrms - 50 Hz

CROSS REGULATION

In the following tables the output voltage cross regulation is measured with static and dynamic

loads and the overall efficiency of the converter measured at different input voltages. All the

output voltages have been measured after the load connector soldering point of the STB

motherboard. The length of the connection cable is 100 mm.

■

FULL LOAD

Vout [V} =

30.06

7.23

12.297

3.278

4.492

Vin [Vrms]=

115

Iout [A] =

0.015

0.500

0.702

2.073

1.103

Iin [Arms] =

0.51

Pout [W] =

0.451

3.615

8.632

6.795

4.955

Pin [W] =

36.0

VUNREG =

37.2

PoutTOT [W] = 24.448

VC11 =

11.88

EFF. = 67.91%

fS = 41÷51 kHz

ALL VOLTAGES ARE WITHIN TOLERANCE

CH1:

VPIN5 - ZCD

CH2:

VPIN4 - ISENSE

CH3:

VPIN7 - OUT

CH4:

VPIN2 - COMP

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