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AN1376 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN1376
Description  25W QUASI-RESONANT FLYBACK CONVERTER FOR
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1376 Datasheet(HTML) 6 Page - STMicroelectronics

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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
4
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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