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24IMS15-05-05-9 Datasheet(PDF) 4 Page - Bel Fuse Inc. |
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24IMS15-05-05-9 Datasheet(HTML) 4 Page - Bel Fuse Inc. |
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4 / 19 page  IMX15, IMY15 , IMS15 Series Data Sheet 15 Watt DC-DC Converters BCD20008-G Rev AE, 25-Aug-2017 Page 4 of 19 MELCHER The Power Partners. 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. Fig. 1 Block diagram of single-output models Fig. 2 Block diagram of -0503-models Fig. 3 Block diagram of double-output models PWM 2 x 2200 pF 1 2 3 4 13 15 12 11 Vi+ SD Vi – Vo1+ Go n.c. Vo2+ Go 03089a 17 R PWM 2 x 2200 pF 1 2 3 4 11 12 15 13 Vi+ SD Vi – Vo1+ Vo1– Trim Vo2+ Vo2– 03090a 17 n.c. PWM 2 x 2200 pF 1500 V 1 2 13 15 Vi+ Vi– Vo+ Vo– 03039a 17 R 4 SD 3 n.c. |
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