STIL

5/11

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:

different output current please refer to the application note AN1600 that provides guidelines to estimate

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

form generator (8/20µs waveform as shown in figures 5, 6 and 7).

Special recommendations for the lightning surge immunity:

2 - Check that no over voltages are applied on the STIL and the bridge diode.

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

()

I

()

π)

2

×

8

-------------------------------------

⋅

+

⋅

=

IEC61000-4-5

STIL

Pt 1

Pt 2

Coupling

network

+

surge

generator

5Vdc

0

OUT

N

L

Figure 6: Surge test characterisation for STIL04/06

Figure 7: Surge test characterisation for STIL08

1

1

5 µs

80A/Div

Ipeak=500A

0 Amps

8 µs

20 µs

IEC61000-4-5

Ipeak

1

1

5 µs

160A/Div

Ipeak=1000A

0 Amps

IEC61000-4-5

Ipeak

8 µs

20 µs