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AN1523 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN1523
Description  11W FLYBACK CONVERTER FOR AUXILIARY POWER SUPPLY APPLICATION USING THE L6590
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1523 Datasheet(HTML) 6 Page - STMicroelectronics

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AN1523 APPLICATION NOTE
6/24
the circuit efficiency is always high and the input power is lower than 1W with twice the specified stand-
by load. In figure 7 the input power as a function of the 5V current, without load on the 12V is represented. The
only shortcoming is the 12V variation: the 12V increases above its limit when the +5V current exceeds 50mA,
due to coupling between the transformer windings. A bit heavier bleeder on the 12V solves this problem very
easily. Decreasing the R8 to 1.2k
or providing for the same residual load, brings the mains power consump-
tion to 1.06W @220Vac delivering 5V@100mA, or to 0.69W@220Vac delivering 5V@50mA.
At the oppo-
site, accepting an higher voltage variation of the 12V, it decreases the input power significantly: increasing R8
to 10K
when delivering 5V@100mA, decrease the consumption to 0.935W@220Vac. Hence, a compro-
mise between the bleeder resistors and the residual loads can be easily found giving the best results in stand-
by. In fact, if a stable load is present on the 5V and we remove the 5V bleeder (R8), delivering
5V@100mA the
consumption becomes 0.886W@220Vac.
In figure 8 there are the waveforms relevant to the L6590 during standby operation: it is easy to recognize that
the switching frequency has decreased from the initial value to about 22KHz. This feature is very important to
5V
12V
220Vac
PoutTOT
Vout
@Iout
Vout
@Iout
Pin
η
[V]
[mA]
[V]
[mA]
[W]
[W]
5.02
10
11.95
0
0.050
0.330
15.2%
5.02
30
12.34
0
0.151
0.474
31.8%
5.02
50
12.66
0
0.251
0.627
40.0%
5.02
80
13.06
0
0.402
0.842
47.7%
5.02
100
13.28
0
0.502
0.986
50.9%
Figure 7. Input power @stand-by
F igure 8 . L6 590 sign als @ I+5V= 50m A -I+12V=0
I+5V=50mA - I+12V=0
Vin = 220 Vrms - 50 Hz
CH1:
VPIN1 – DRAIN VOLTAGE
CH2:
VPIN4 - COMP
CH3:
VPIN3 - Vcc
INPUT POWER @LOW LOAD
0.000
0.100
0.200
0.300
0.400
0.500
0.600
0.700
0.800
0.900
1.000
1.100
1 0
30
50
80
100
Iout +5 V
Pin @220Vac [W]
Pin @115Vac [W]


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