IMS30 데이터 시트보기 (PDF) - Power-One Inc.

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IMS30

Dual outputs 5V & 3.3V ; 3.3V & 1.8V

Power-One Inc. 

Table 14: Insulation concept leading to an SELV output circuit

Conditions Front end

DC-DC converter

Result

Supply

voltage

Minimum required grade Maximum

of isolation, to be provided DC output

by the AC-DC front end, voltage

including mains supplied from the

battery charger

front end 1

Minimum required safety

status of the front end

output circuit

Measures to achieve the

specified safety status of the

output circuit

Safety status of

the DC-DC

converter output

circuit

Mains

Basic

250 V AC

60 V

Earthed SELV circuit 2

Operational insulation (pro- SELV circuit

vided by the DC-DC converter)

>60 V

ELV circuit

Hazardous voltage

secondary circuit

Input fuse 3 output suppressor

diode(s) 4, and earthed

output circuit(s) 2

Earthed SELV

circuit

Double or reinforced

60 V

SELV circuit

Operational insulation (pro- SELV circuit

vided by the DC-DC converter)

>60 V

TNV-2 circuit

Supplementary insulation,

Double or reinforced insu- based on the maximum input

lated unearthed hazardous voltage (provided by the

voltage secondary circuit 5 DC-DC converter)

1 The front end output voltage should match the specified input voltage range of the DC-DC converter.

2 The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950.

3 The installer shall provide an approved fuse (type with the lowest rating suitable for the application) in a non-earthed input line directly

at the input of the DC-DC converter (see fig.: Schematic safety concept). For UL’s purpose, the fuse needs to be UL-listed. See also:

Input Fuse.

4 Each suppressor diode should be dimensioned in such a way, that in the case of an insulation fault the diode is able to limit the output

voltage to SELV (<60 V) until the input fuse blows (see fig.: Schematic safety concept).

5 Has to be insulated from earth by basic insulation according to the relevant safety standard, based on the maximum output voltage

from the front end.

~

Mains

~

AC-DC

front

end

Fuse

Battery

Earth

connection

DC-DC

con-

verter

10004

+

Suppressor

diode SELV

–

Earth

connection

Fig. 13

Schematic safety concept. Use fuse, suppressor diode

and earth connection as per table: Safety concept leading

to an SELV output circuit.

Description of Option

Option i Inhibit

Excluces shut down

The output(s) of the converter may be enabled or disabled

by means of a logic signal (TTL, CMOS, etc.) applied to the

inhibit pin. No output voltage overshoot will occur when the

unit is turned on. If the inhibit function is not required the

inhibit pin should be connected to Vi– to enable the output

(active low logic, fail safe).

Converter operating:

Converter inhibited or

inhibit pin left open circuit

–10 V...0.8 V

2.4...5 V

06070

Vi+

i

Vi –

Fig. 14

If the inhibit is not used the inhibit pin should be con-

nected to Vi–

11/11

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