24IMS15 查看數據表（PDF） - Bel Fuse Inc.

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24IMS15

15 Watt DC-DC Converters

Bel Fuse Inc. 

IMX15, IMY15, IMS15 Series Data Sheet

15 Watt DC-DC Converters

Functional Description

The IMX15/IMS15/IMY15 Series of DC-DC converters are

magnetic feedback-controlled flyback converters using current

mode PWM (Pulse Width Modulation). The -05- and -0503-

output voltage models exhibit an active magnetic feedback

loop via a pulse transformer, resulting in very tight regulation of

the output voltage (see the block diagrams). The output

voltages of these models can be adjusted via the

R-input. The R-input is referenced to the secondary side and

allows for programming the output voltages in the range of

approximately 80 to 105% of Vo nom, using either an external

resistor or an external voltage source.

Several single-output models with 3.3 or 5.1 V output exhibit a

synchronous rectifier to improve the efficiency.

The voltage regulation on the double-output models is

achieved with an auxiliary winding of the main transformer. The

output voltages can be adjusted via the Trim input, which is

referenced to the primary side and allows for programming the

output voltage in the range of 100 to 105% of Vo nom via an

external resistor, or within 75 to 105% if using an external

voltage source. The load regulation output characteristic allows

for paralleling of one or more double-output models with equal

output voltage.

Current limitation is provided by the primary circuit, thus limiting

the total output power of double-output models. The shutdown

input allows remote converter on/off.

Overtemperature protection will disable the converter under

excessive overload conditions with automatic restart.

Vi+ 1

SD 4

n.c. 3

PWM

Vi – 2

2 x 2200 pF

Fig. 2

Block diagram of -0503-models

Vi+ 1

SD 4

Trim 3

PWM

03089a

13 Vo1+

15 Go

11 Vo2+

12 Go

17 R

03090a

11 Vo1+

12 Vo1–

13 Vo2+

Vi+ 1

SD 4

n.c. 3

V i– 2

PWM

2 x 2200 pF

1500 V

03039a

13 Vo+

15 Vo–

Vi – 2

2 x 2200 pF

Fig. 3

Block diagram of double-output models

15 Vo2–

17 n.c.

17 R

Fig. 1

Block diagram of single-output models

BCD20008-G Rev AE, 25-Aug-2017

MELCHER

The Power Partners.

Page 4 of 19

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