24IMS 查看數據表（PDF） - Bel Fuse Inc.

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24IMS

15 Watt DC-DC Converters

Bel Fuse Inc. 

IMX15, IMY15, IMS15 Series Data Sheet

15 Watt DC-DC Converters

a) Adjustment by means of an external resistor Rext:

Programming of the output voltage by means of an external

resistor Rext is possible within 100 to 105% of Vo nom. Rext

should be connected between the Trim pin and Vi–.

Connection of Rext to Vi+ may damage the converter. The

table below indicates suitable resistor values for typical

output voltages under nominal conditions (Vi nom, Io = 0.5

Io nom) with either parallel-connected outputs or equal-load

conditions on both outputs.

Table 9a: Rext for Vo > Vo nom;

approximate values (Vi nom, Io1, 2 = 0.5 Io1/2 nom )

Vo [ % Vo nom]

105 to 108 (107 typically)

105

104

103

102

101

100

Rext [kΩ]

0

1.5

5.6

12

27

68

∞

b) Adjustment by an external voltage source Vext:

For programming the output voltage in the range 75 to

105% of Vo nom, a source Vext (0 to 20 V) is required,

connected between the Trim pin and Vi–. The table below

indicates values Vo versus Vext (nominal conditions Vi nom, Io

= 0.5 Io nom), with either parallel-connected outputs or equal

load conditions on both outputs. Applying a control voltage

>20 V will set the converter into a hiccup mode. Direct

paralleling of the Trim pins of parallel connected converters

is possible.

Table 9b: Vo versus Vext for Vo = 75 to 105% Vo nom;

typical values (Vi nom, Io1/2 = 0.5 Io1/2 nom)

Vo [ % Vo nom]

≥105

102

95

85

75

Vext [V ]

0

1.6

4.5

9

13

Electromagnetic Compatibility (EMC)

A suppressor diode together with an input filter forms an

effective protection against high input transient voltages, which

typically occur in many installations, but especially in battery-

driven mobile applications.

Electromagnetic Immunity

Table 10: Immunity type tests

Phenomenon Standard

Electrostatic

discharge

to case

IEC/EN

61000-4-2

Electromagnetic

field

IEC / EN

61000-4-3

ENV 50204

Electrical fast

IEC / EN

transients/burst 61000-4-4

Surges

RF conducted

immunity

IEC/EN

61000-4-5

IEC/EN

61000-4-6

Class

Level

Coupling

mode 2

2 contact discharge

(R pin open)

3

air discharge

(R pin open)

x5

antenna

36

3

antenna

34

direct +i/–i

2

+i /–i

31

3

+i /–i

26

Value

applied

4000 Vp

8000 Vp

Waveform

1/50 ns

Source

Imped.

330 Ω

150 pF

Test

procedure

10 positive and

10 negative

discharges

20 V/m 5

3 V/m 6

AM 80%

1 kHz

10 V/m

PM, 50% duty

cycle, 200 Hz

repetition frequ.

2000 Vp 4

bursts of 5/50 ns

5 kHz rep. rate

transients with

15 ms burst

duration and a

300 ms period

1000 Vp

2000 Vp 1

10 VAC

3 VAC 6

1.2/50 µs

AM modulated

80%, 1 kHz

n.a.

n.a.

50 Ω

2Ω

18 µF

150 Ω

80 to 1000 MHz

900 MHz

60 s positive

60 s negative

transients per

coupling mode

5 pos. and 5 neg.

surges

0.15 to 80 MHz

In Perf.

oper. crit. 3

yes B

yes A

yes A

yes A

yes B

yes A

1 External components required; see Fig. 6 and table 6.

2 i = input, o = output.

3 A = normal operation, no deviation from specs., B = temporary deviation from specs. possible.

4 Corresponds to the railway standard EN 50121-3-2:2006, table 9.3.

5 Corresponds to the railway standard EN 50121-3-2:2006, table 9.1.

6 Valid for 24IMS15 and 48IMS15

BCD20008-G Rev AE, 25-Aug-2017

MELCHER

The Power Partners.

Page 14 of 19

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