5

EN/LZT 146 33 R1A (Replaces EN/LZT 137 09 R7) © Ericsson Microelectronics AB, June 2000

Safety

Dual output (negative output 2)

Dual output (positive output 2)

Typical input characteristics

HF Attenuation (input to output)

The PKF Series DC/DC power modules are designed in accordance

with EN 60 950, Safety of information technology equipment including

electrical business equipment. SEMKO certificate no. 9709166.

The PKF power modules are recognized by UL and meet the applica-

ble requirements in UL 1950 Safety of information technology equipment,

the applicable Canadian safety requirements and UL 1012 Standard

for power supplies.

The DC/DC power module shall be installed in an end-use equip-

ment and considerations should be given to measuring the pin tem-

nent tests are conducted with the input protected by an external 3 A

fuse. The need for repeating these tests in the end-use appliance shall

be considered if installed in a circuit having higher rated devices.

When the supply to the DC/DC power module meets all the require-

ments for SELV (<60 V dc), the output is considered to remain within

SELV limits (level 3). The isolation is an operational insulation in

accordance with EN 60 950.

The DC/DC power module is intended to be supplied by isolated

secondary circuitry and shall be installed in compliance with the

requirements of the ultimate application. If they are connected to a

60 V DC system reinforced insulation must be provided in the power

supply that isolates the input from the mains. Single fault testing in

the power supply must be performed in combination with the

DC/DC power module to demonstrate that the output meets the

requirement for SELV. One pole of the input and one pole of the

output is to be grounded or both are to be kept floating.

The terminal pins are only intended for connection to mating con-

nectors of internal wiring inside the end-use equipment.

These DC/DC power modules may be used in telephone equipment

in accordance with paragraph 34 A.1 of UL 1459 (Standard for Tele-

phone Equipment, second edition).

The galvanic isolation is verified in an electric strength test. Test

production the test duration may be decreased to 1 s.

The capacitor between input and output has a value of 1 nF and the

leakage current is less than 1µA @ 53 V dc.

The case is designed in non-conductive epoxy. Its flammability

rating meets UL 94V-0. The oxygen index is 34%

.

Fundamental circuit diagrams

Single output

Electrical Data

Single voltage pulse at +25 °C ambient temperature.

Transient input voltage

130

120

110

90

Transient duration (s)

70

100

80

110

×

-4

110

×

-6

110

×

-2

11 10

×

2