®
STIL
AC INRUSH CURRENT LIMITER
ASD
APPLICATIONS
TAB
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High power density switching power supply
Server and Telecom power supplies
Game station power supplies
High end TV displays
Portable equipment adaptators
5
23
1
4
PENTAWATT HV2
STIL04-P5
TAB
FEATURES
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Replaces two diodes of the bridge in steady
state
Dual unidirectional switches in a single
package
Inrush current limitation circuit for off-line
power supply
Designed for instantaneous response after AC
line drop out or browning
Surge current capability as per IEC61000-4-5
BENEFITS
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■
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■
■
od
s)
r
P
t(
te
uc
le
o
od
r
s
P
b
O
te
le
so
b
O
Figure 1: Block diagram
L
Pt1
Low consumption (I
Pt
= 20mA)
High noise immunity:
dV/dt> 1000V/µs @ Tj=125°C
Low reverse current losses
Integrated pilot driver of the power switches
Suitable where efficiency and space are critical
uc
s)
t(
O
-
Table 1: Order Codes
Part Number
STIL04-P5
STIL04-T5
STIL06-T5
STIL08-T5
so
b
PENTAWATT
STIL04-T5
te
le
1
2 3
4
5
ro
P
uc
d
TAB
PENTAWATT
STIL06-T5
s)
t(
1
2 3
4
5
1
2 3
4
5
bs
-O
l
o
te
e
r
P
od
PENTAWATT
STIL08-T5
Marking
STIL04P5
STIL04T5
STIL06T5
STIL08T5
s)
t(
uc
Table 2: Pin Out Description
Pin out
designation
L
Pt1
OUT
Pt2
N
Description
AC Line (switch1)
Drive of power switch 1
Output
Drive of power switch 2
AC Neutral (switch 2)
Position
1
2
3
4
5
Figure 2: Basic connection
Inrush resistor
L
DRIVER
-
Pt2
+
OUT
AC in
Auxil.
Supply
Pt1
Pt2
+
OUT
VOUT
Main
Converter
ASD: Application Specific Devices.
December 2005
+
N
N
REV. 5
1/11
STIL
FUNCTIONAL DESCRIPTION IN A PFC BOOST PRE-REGULATOR
The STIL is connected in parallel with the diode bridge and the inrush power resistor. During start up, the
two unidirectional ASD power switches of the STIL are open (Figure 3). The inrush current flows through
the diodes of the bridge and external inrush power resistor. When the PFC reaches steady state, the
auxiliary power supply coupled with the main transformer, supplies the energy required to feed the driver
of the two power switches of the STIL (Figure 4). In steady state, the two DC ground connected diodes of
the bridge rectifier and the two unidirectional switches of the STIL connected to DC+ rectify the AC line
current.
Figure 3: Function description at turn-on
I
pt1
+
I
pt2
Auxiliary Power
AC in
-
+
Bridge
I
OUT
Inrush resistor
-
et
l
)
(s
so
b
ct
u
d
-O
ro
s)
P
t(
te
uc
le
o
od
r
s
P
b
O
te
le
so
b
O
Figure 4: Function description in steady state
I
pt1
b
O
so
te
le
ro
P
uc
d
s)
t(
DRIVER
P
e
od
r
s)
t(
uc
DRIVER
+
I
pt2
Auxiliary Power
AC in
-
+
I
OUT
Bridge
Inrush resistor
POWERFAIL FEATURE
When the STIL is used with a PFC boost converter, the inrush current circuit is active after an AC line drop-
out. In that configuration, since the AC line disappears, the PFC controller and the auxiliary power supply
of the STIL (Figure 8) turns OFF. The two switches of the STIL are open. The output bulk capacitor Cb is
discharging and it is providing the energy to the main converter. When the AC line recovers, the two
switches remain opened and recharging inrush current of the capacitor Cb is deviated and limited through
the resistor Ri. When the capacitor had finished charging, the PFC turns ON again and the two switches
of the STIL switch ON.
More details on the design and operation of the driver circuit of figure 5 can be found in the application
note
“AN1600 - STIL: Inrush Current Limitation Device for Off-Line Power Converter”.
2/11
STIL
Table 3: Absolute Maximum Ratings
(limiting value)
Symbol
Parameter
Repetitive forward off-state voltage,
between terminals L or N and OUT ter-
minal
Repetitive reverse off-state voltage,
between OUT terminals and terminals L
or N
Value
STIL04 STIL06 STIL08
T
j
= 0 to 150°C
700
Unit
V
DOUT
V
V
ROUT
T
j
= 0 to 150°C
700
800
800
V
I
out(AV)
Average on state current at the OUT ter-
T
j
= 150°C
minal (180° conduction angle for the
internal power switches)
T
j
= 150°C
4
6
8
RMS on state current at the OUT termi-
I
out(RMS)
nal (180° conduction angle for the inter-
nal power switches)
I
TSM
I
2
t
4.4
Non repetitive surge peak on-state cur-
t = 10ms
rent for each AC input terminals L and N
p
sinusoidal
(T
j
initial = 25°C)
I
2
t value - rating for fusing
t
p
= 10ms
65
Critical rate of rise of on state current
dI
out
/dt
I
Pt1
+ I
Pt2
= 20mA
T
stg
T
j
Storage temperature range
)-
(s
so
b
ct
u
d
-O
ro
s)
P
t(
te
uc
le
o
od
r
s
P
b
O
te
le
so
b
O
Junction temperature range
Table 4: Thermal Parameters
Symbol
Rth
(j-c)
Parameter
Junction to case
Rth
(j-a)
Junction to ambient
b
O
T
j
= 0 to 150°C
so
te
le
r
P
d
o
70
24
6.7
uc
8.9
s)
t(
A
A
21
et
l
P
e
od
r
100
s)
t(
uc
100
50
A
A
2
s
A/µs
°C
°C
-40 to +150
0 to +150
Value
2
60
Unit
°C/W
3/11
STIL
Table 5: Electrical Characteristics
Values
Symbol
Parameter
Test conditions
STIL04
STIL06
STIL08
Unit
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
I
Pt1
+
I
Pt2
V
D(Pt1)
V
D(Pt2)
V
R(Pt1)
V
R(Pt2)
Driver trigger
current
T = 0°C
V
Dout
= 12V(DC)
j
R
L
= 30Ω
T
j
= 25°C
T
j
= 0°C
Direct driver
trigger voltage
0.6
12
10
0.85
0.8
0.45
1
0.95
0.2
8
500
1000
5
20
12
10
0.85
0.8
0.45
1
0.95
0.2
8
20
12
10
0.8
0.75
0.4
1
0.9
V
20
mA
V
Dout
= 12V(DC)
T
j
= 25°C
R
L
= 30Ω
T
j
= 150°C 0.2
8
Maximum repetitive reverse driver T = 25°C
j
voltage
Linear slope up
to V
Dout
= 470V
dV
Dout
/dt Dynamic
voltage rising
Max reverse
I
Rout
(off)* current without
driver current
Max reverse
I
Rout
(on)* current with
driver current
T
j
= 150°C 500
T
j
= 125°C 1000
T
j
= 25°C
V
Rout
= 800V
I
Pt1
= I
Pt2
= open T = 150°C
j
V
Rout
= 400V
T = 150°C
I
Pt1
= I
Pt2
= 10mA
j
I
out(AV)
= 4A
300
-
et
l
)
(s
so
b
ct
u
d
-O
ro
s)
P
t(
te
uc
le
o
od
r
s
P
b
O
te
le
so
b
O
0.75
0.9
V
t0
Threshold direct
voltage for one I
out(AV)
= 6A
power switch
I
out(AV)
= 8A
Dynamic
resistance for
one power
switch
I
out(AV)
= 4A
T
j
= 150°C
55
80
R
d
I
out(AV)
= 6A
I
out(AV)
= 8A
I
in
= 4A
T
j
= 150°C
0.95
1.4
V
F
**
Forward voltage
I
in
= 6A
drop for one
power switch
I
in
= 8A
T
j
= 150°C
Pulse test:
* tp = 300 ms,
δ
< 2%
** tp = 380 µs,
δ
< 2%
b
O
so
300
te
le
ro
P
5
300
300
0.9
1000
uc
d
500
s)
t(
5
300
300
V
P
e
0.75
45
od
r
s)
t(
uc
0.75
0.9
V/µs
µA
µA
V
50
30
40
mΩ
1.05 1.35
0.97
1.2
V
4/11
STIL
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:
(
I
out
(
AV
)
× π )
-
P
tot
=
V
t0
⋅
I
out
(
AV
)
+
R
d
⋅
------------------------------------
8
If the output average current is 8Amps, V
t0
and R
d
of the electrical characteristics table can be used. For
different output current please refer to the application note AN1600 that provides guidelines to estimate
the correct values of V
t0
and R
d
.
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
PEAK
(I
PEAK
= 500A for STIL04/STIL06 and I
PEAK
= 1000A for STIL08) as defined by the combine wave-
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
PEAK
in the STIL stays below the limit specified above.
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
out
/dt) through the structure of the STIL, it is recom-
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
2
-
et
l
)
(s
so
b
ct
u
d
-O
ro
s)
P
t(
te
uc
le
o
od
r
s
P
b
O
te
le
so
b
O
L
IEC61000-4-5
b
O
so
te
le
5Vdc
ro
P
uc
d
s)
t(
P
e
od
r
s)
t(
uc
STIL
DRIVER
Pt 1
Pt 2
OUT
Figure 6: Surge test characterisation for STIL04/06
IEC61000-4-5
1
5 µs
80A/Div
I
OUT
Ipeak=500A
Ipeak
0 Amps
8 µs
20 µs
+
N
0
V
OUT
Coupling
network
+
surge
generator
(l
evel 1, 2, 3 or 4)
I
OUT
Figure 7: Surge test characterisation for STIL08
IEC61000-4-5
1
5 µs
160A/Div
I
OUT
Ipeak=1000A
Ipeak
1
0 Amps
1
8 µs
20 µs
5/11
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