STIL ST Microelectronics, STIL Datasheet - Page 5

• Manufacturer Part Number: STIL
• Description: AC INRUSH CURRENT LIMITER
• Manufacturer: ST Microelectronics

POWER LOSSES CALCULATION
When the input current is sinusoidal (case of PFC), the conducted power losses can be calculated by us-
ing the following formula:
If the output average current is 8Amps, V
different output current please refer to the application note AN1600 that provides guidelines to estimate
the correct values of V
LIGHTNING SURGE IMMUNITY (IEC61000-4-5)
During lightning surge transient voltage across the AC line, over current and over voltage stress are ap-
plied on all the components of the power supply. The STIL can sustain a maximum peak surge current up
to I
form generator (8/20µs waveform as shown in figures 5, 6 and 7).
Special recommendations for the lightning surge immunity:
1 - Check that the I
2 - Check that no over voltages are applied on the STIL and the bridge diode.
3 - In order to reduce the dynamic current stress (dI
mended to connect a differential mode choke coil in front of the STIL and the bridge diode.
More details and design guidelines are provided in the application note “AN1600 - STIL: Inrush Current
Limitation Device for Off-Line Power Converter”.
Figure 5: Surge test condition
Figure 6: Surge test characterisation for STIL04/06
P
PEAK
0 Amps
1
tot
5 µs
80A/Div
I
OUT
=
Ipeak=500A
(I
PEAK
V
t0
8 µs
⋅
= 500A for STIL04/STIL06 and I
I
out AV
20 µs
(
PEAK
IEC61000-4-5
Ipeak
OUT
t0
)
+
in the STIL stays below the limit specified above.
and R
R
+
d
N
⋅
I (
------------------------------------ -
d
.
out AV
L
(
STIL
8
)
×
t0
Pt 1
Pt 2
π )
and R
V
OUT
2
1
PEAK
IEC61000-4-5
d
of the electrical characteristics table can be used. For
= 1000A for STIL08) as defined by the combine wave-
out
I
OUT
Figure 7: Surge test characterisation for STIL08
/dt) through the structure of the STIL, it is recom-
0 Amps
1
5 µs
160A/Div
I
OUT
Ipeak=1000A
0
8 µs
5Vdc
(l
20 µs
evel 1, 2, 3 or 4)
generator
Coupling
network
surge
IEC61000-4-5
+
Ipeak
STIL
1
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