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BCD20009-G Rev F, 20-Nov-2020

Page 3 of 16

IMX35 Series

35 Watt Quad-Output DC-DC Converter

© 2020 Bel Power Solutions & Protection

Part Number Description

Input voltage range V

i

9 to 36 VDC............................................ 20

18 to 75 VDC............................................ 40

40 to 121 VDC............................................ 70

60 to 150 VDC...........................................110

Series ....................................................................... IMX35

Operating ambient temperature range

T

Options:

Inhibit.............................................................-i

Open frame .................................................. Z

RoHS compliant for all six substances....... G

40 IMX35 -D05 D05 -8 i Z G

Note: The sequence of options must follow the order above !

NFND: Not for new designs.

Preferred for new designs.

Functional Description

The IMX35 converters are comprised of 2 feedback-controlled interleaved-switching flyback powertrains using current mode control.

Each converter consists of 4 electrically isolated outputs deriving from the 2 power trains. Vo1, Vo4 derive from the first powertrain

and Vo2, Vo3 from the second one. Thus each pair of outputs is independent from the other one.

Voltage regulation for each pair of outputs is achieved with passive transformer feedback from the main transformer of the powertrain.

Each pair of outputs has the same output voltage (i.e. D05, D12, etc.). If both powertrains have the same nominal output voltage (e.g.

D12D12), all outputs may be simultaneously adjusted by the Trim input (pin 5). In case of different output voltages (e.g. D05D15), the

Trim1 input influences only Vo1 and Vo4.

Current limitation is provided on the primary side for each powertrain and limits the possible output power for each pair of outputs. In

the case of an overload on either of the power trains, which causes the output voltage to fall to less than typically 70% of V

entire converter shuts down and automatically restart in short intervals (hiccup mode).

The incorporated overtemperature protection shuts down the hole converter in the case of overtemperature and resumes automatically

after cooling down.

PWM

4

8

1

Vi+

SD

PUL

5

Trim/Trim1

6

W

7

Ref

2

Vi–

16

15

17

18

13

14

12

11

Vo4–

Vo1+

Vo1–

Vo4+

Vo2+

Vo2–

Vo3+

Vo3–

03098b

3

n.c.

19

n.c.

Fig. 1

Block diagram of quad-output models