LS4899-7B1 데이터 시트보기 (PDF) - Power-One Inc.

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LS4899-7B1

100 Watt AC-DC Converters with PFC

Power-One Inc. 

Cassette Style

100 Watt AC-DC Converters

S Series PFC

Standards and Approvals

All AC-DC converters correspond to class I equipment.

They are UL recognized according to UL 1950, UL recog-

nized for Canada to CAN/CSA C22.2 No. 950-95 and LGA

approved to IEC/EN 60950 standards.

The units have been evaluated for:

• Building in

• Basic insulation between input and case, based on 250 V

AC and 400 V DC

• Double or reinforced insulation between input and output,

based on 250 V AC and 400 V DC

• Basic insulation between output and case based on

200 V AC and DC

• Operational insulation between output and output

• Connecting the input to a primary or secondary circuit

which is subject to a maximum transient rating of 2500 V

(overvoltage category III based on a 110 V primary cir-

cuit, overvoltage category II based on a 230 V primary

circuit).

• The use in a pollution degree 2 environment

• The UL 1950 recognition limits the minimum input voltage

to Ui = Ui min + 5 V AC = 90 V AC if the case temperature

exceeds 90°C.

The AC-DC converters are subject to manufacturing sur-

veillance in accordance with the above mentioned UL,

CSA, EN and with ISO 9001 standards.

Isolation

The electric strength test is performed as factory test in ac-

cordance with IEC/EN 60950 and UL 1950 and should not

be repeated in the field. Power-One will not honour any

guarantee claims resulting from electric strength field tests.

Important: Testing by applying AC voltages will result in

high and dangerous leakage currents flowing through

the Y-capacitors (see fig.: Block diagram).

Table 13: Isolation

Characteristic

Input to Input to Output to Output to Unit

case

output

case

output

Electric

strength

test voltage

Required according to

IEC/EN 60950

Actual factory test 1 s

1.5

3.0 1

–

–

kVrms

2.1

4.2 1

–

–

kV DC

2.8

5.6 1

1.4

0.14

AC test voltage equivalent 2.0

4.0 1

1.0

to actual factory test

0.1

kVrms

Insulation resistance at 500 V DC

>300

>300

>300

>100 2

MΩ

1 In accordance with IEC/EN 60950 only subassemblies are tested in factory with this voltage.

2 Tested at 100 V DC.

For creepage distances and clearances refer to: Technical Information: Safety.

Leakage Currents in AC-DC operation

Leakage currents flow due to internal leakage capacitance

and RFI suppression Y-capacitors. The current values are

proportional to the mains voltage and nearly proportional to

the mains frequency and are specified at an input voltage of

254 V (50 Hz) where phase, neutral and protective earth

are correctly connected as required for class I equipment.

MI

500 Ω

1500 Ω

10 kΩ 220 nF

Under test conditions the leakage current flows through a

measuring instrument (MI) as described in fig.: Measuring

instrument for earth leakage current tests, which takes into

account impedance and sensitivity of a person touching

unearthed accessible parts. The current value is calculated

by dividing the measured voltage by 500 Ω. If inputs of S-

units are connected in parallel, their individual leakage cur-

rents are added.

P

10062

P

Vo+

N

N

Vo–

22 nF

V

MI for

earth

leakage

current

Fig. 28

Measuring instrument (MI) for earth leaking current tests

according to IEC/EN 60950.

Fig. 29

Test set-up

Edition 01/01.2001

20/27

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