STIL04P5 datasheet(5/11 Pages) STMICROELECTRONICS

5 / 11 page

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:

If the output average current is 8Amps, Vt0 and Rd 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 Vt0 and Rd.

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 IPEAK (IPEAK = 500A for STIL04/STIL06 and IPEAK = 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 IPEAK 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 (dIout/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

Ptot Vt0 Iout AV

()

( out AV

()

π)

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

⋅

IEC61000-4-5

STIL

Pt 1

Pt 2

IOUT

VOUT

Coupling

network

surge

generator

(level 1, 2, 3 or 4)

5Vdc

OUT

Figure 6: Surge test characterisation for STIL04/06

Figure 7: Surge test characterisation for STIL08

5 µs

80A/Div

IOUT

Ipeak=500A

0 Amps

8 µs

20 µs

IEC61000-4-5

Ipeak

5 µs

160A/Div

IOUT

Ipeak=1000A

0 Amps

IEC61000-4-5

Ipeak

8 µs

20 µs

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