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BCD20009-G Rev F, 20-Nov-2020

Page 8 of 16

IMX35 Series

35 Watt Quad-Output DC-DC Converter

© 2020 Bel Power Solutions & Protection

Series and Parallel Connection

The outputs of one or several double-output powertrains may be connected in series respecting the current limitation.

Both outputs of the same powertrain can always be connected in parallel in will behave like a single output.

Several outputs of the same converter with equal output voltage (e.g. 5 V / 5 V) can be connected in parallel and will share their

output currents almost equally.

If outputs of the same converter are being parallel and series-connected, it is recommended that outputs from the same powertrains

are parallel-connected first. This applies for instance, if 24 V shall be generated by a converter with four 12 V outputs; see fig. 7.

PWM

4

8

1

Vi+

SD

PUL

5

Trim

6

W

7

Ref

2

Vi–

16

15

17

18

13

14

12

11

Vo4–

Vo1+

Vo1–

Vo4+

Vo2+

Vo2–

Vo3+

Vo3–

3

n.c.

19

JM138a

n.c.

–24V

+24V

IMX35D12D12

Fig. 7

Generating 24 V with an IMX35D12D12-8

Note: Parallel operation of several converters may cause start-up problems. This becomes noticeable in applications, where one converter is

not able to deliver the full resistive and capacitive load current alone, as it is required in true redundant systems.

Typical Performance Curves

General conditions:

– T

– Shut down and Trim pin left open-circuit.

8

9

10

11

12

13

0.5

1

1.5

2

A

0

05020-X35

11.5

12

12.5

13

13.5

0.06

0.2

0.3

0.4

0.5

0.6

0.7 A

0.1

05164b

Fig. 8

V

outputs in parallel (e.g., V

Fig. 9

Cross load regulation (typ.) on powertrain 1. V