IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015

Page 3 of 14

MELCHER

The Power Partners.

Functional Description

The IMX7/IMS7 Series DC-DC converters are feedback-

controlled flyback converters using current mode PWM (Pulse

Width Modulation).

In the case of single-output models, the output is directly

sensed and fed back to the primary control circuit via a pulse

transformer, resulting in tight regulation of the output voltage.

The R input is referenced to the secondary side and allows for

programming the output voltages in the range 75 to 105% of

source.

For double-output models, the output voltage is sensed by a

separate transformer winding close to the secondary and fed

Fig. 2

Block diagram of double-output models

Fig. 1

Block diagram of single-output models

back to the primary control circuit. Close magnetic coupling is

provided by the planar construction, ensuring very good

regulation, and allowing for flexible load distribution. The Trim

input of double-output models is referenced to the primary side,

and allows for programming the output voltages in the range of

Current limitation is provided by the primary circuit, thus limiting

The inhibit input i allows remote control of the outputs; pin i

must be connected to Vi– to activate the converter.

Part Number Description

8.4 – 36 V .............................................. 20

14 – 36 V ............................................... 24

16.8 – 75 V ............................................ 40

36 – 75 V ............................................... 48

40 – 121 V ............................................. 70

60 – 150 V ........................................... 110

Series .............................................................. IMX7, IMS7

Output voltage of output 1 ...................... 03, 05, 12, 15, 24

Output voltage of output 2 ............................ 05, 12, 15, 24

–40 to 85 °C ............................................... -8

–40 to 71 °C ............................................... -9

Options:

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

Obsolete option: C-pinout ............................................... C

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

Example:

40IMX7-05-05-8ZG: DC-DC converter, input voltage range 16.8 – 75 V, 2 outputs providing each 5 V, 700 mA,

temperature range – 40 to 85 °C, open frame, RoHS compliant for all six substances.

40 IMX7 - 05 - 05 -8 Z G

PWM

2

× 2200 pF

1500

V

13

1

2

3

4

11

10

12

14

Vi+

i

Vi–

n.c.

Vo+

Vo–

R

n.c.

03025a

PWM

2

× 2200 pF

14

1

2

3

4

11

10

12

13

Vi+

Trim

i

Vi –

Vo1+

Vo1–

Vo2+

Vo2–

n.c.

03042b