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48IMS30-0302-9G Datasheet(PDF) 6 Page - Power-One |
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48IMS30-0302-9G Datasheet(HTML) 6 Page - Power-One |
6 / 6 page Extendable output power characterisation of 48IMS30-0302-9G under forced air condition 20 22 24 26 28 30 32 0 100 200 300 400 500 600 700 800 Air-Flow (LFM) Table 6: Typical values for undervoltage lockout (PUL) settings. 48 IMS 30 Rext [k ] Ui min [V] 31 50 34 29 36 20 38 15 40 Auxiliary Functions Shut Down Function The outputs of the converters may be enabled or disabled by means of a logic signal (TTL, CMOS, etc.) applied to the shut down pin. If the shut down function is not required then pin should be left open-circuit. Converter operating: 2.0...5.0 V Converter shut down: –1...0.7 V The shut down pin can also be used as a programmable undervoltage lockout. The undervoltage lockout values for the 48 IMS30 series is 31 V with a 0.5V hysteresis window which can be trimmed up by means of an external resistor connected between the SD/PUL pin and Vi– pin. Adjustable Output Voltage As a standard feature, the IMS 30 units offer adjustable output voltage by using the secondary referenced control Trim. If the control input is left open-circuit the output volt- age is set to Uo nom. Adjustment of the output voltage is pos- sible by means of an external resistor Rext connected be- tween the Trim pin and the either Vo+ or Vo–. Vo+ Vi+ Vi– Vo– 06133 R ext SD/PUL Fig. 8 Shut down (SD) and undervoltage lockout (PUL) function. Vo+ Vi+ Vi– Vo– 06134 Trim R ext 1 R ext 2 Fig. 9 Output voltage Trim. Table 7: Uo versus Uext for Uo = 90...110% Uo nom; typical values (Ui nom, Io1/2 = 0.5 Io1/2 nom) Rext 1 Rext 2 Uo nom [V] Uo [V] [k] Uo [V] [k] 3.3 2.97 8 3.63 5 Synchronisation The IMS 30 provides a bi-directional synchronisation func- tion to synchronise several IMS 30 units operated in parallel connection. When the W pins (SYNC) are connected to- gether, the converters will lock to the highest switching fre- quency. The faster controller becomes the master, produc- ing a 4.3 V, 200 ns pulse train. Only one, the highest fre- quency SYNC signal, will appear on the Sync line. 6/11 Thermal Considerations If a converter, mounted on a PCB, is located in free, quasi- stationary air (convection cooling) at the indicated maxi- mum ambient temperature TA max (see table: Temperature specifications) and is operated at its nominal input voltage and output power, the case temperature TC measured at the Measuring point of case temperature TC (see: Mechanical Data) will approach the indicated value TC max after the warm-up phase. However, the relationship between TA and TC depends heavily on the conditions of operation and inte- gration into a system. The thermal conditions are influenced by input voltage, output current, airflow, temperature of sur- rounding components and surfaces and the properties of the printed circuit board. TA max is therefore only an indica- tive value and under practical operating conditions, the ad- missible ambient temperature TA may be higher or lower than this value. Caution: The case temperature TC measured at the Measuring point of case temperature TC (see: Mechani- cal Data) must under no circumstances exceed the specified maximum value. The installer must ensure that under all operating conditions TC remains within the lim- its stated in the table: Temperature specifications. Short Circuit Behaviour The current limit characteristic shuts down the converter whenever a short circuit or an overload is applied to its out- put. It acts self-protecting and automatically recovers after removal of the overload condition (hiccup mode). Overtemperature Protection The converters are protected from possible overheating by means of an internal non latching temperature monitoring circuit. It shuts down the unit above the internal tempera- ture limit and attempts to automatically restart in short peri- ods. This feature prevents excessive internal temperature excursion which could occur in heavy overload conditions. Typical Performance Curves General conditions : TA = 25oC, unless TC is specified. Shut down pin left open- circuit. Trim input not connected. Fig. 5 Overload switch off (hiccup mode), typical values. 100 Uo [%] t [ms] 05162 100 10 0 |
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