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PSA481-7IR Datasheet(PDF) 2 Page - Power-One |
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PSA481-7IR Datasheet(HTML) 2 Page - Power-One |
2 / 13 page PSA Series Extended Data Sheet Positive Switching Regulator (Rugged) REV. SEP 23, 2003 Page 2 of 13 Type Key and Product Marking PSA 12 1.5 -7 i R P Y Positive switching regulator in case A01 .................... PSA Nominal output voltage in volt ................................ 12...48 Nominal output current in ampere ........................... 1...1.5 Operational ambient temperature range T A –25...71°C ........................................................... -7 –40...71°C (option) .............................................. -9 Inhibit input ........................................................................ i Control input for output voltage adjustment 1 .................. R Potentiometer 1 (option) ................................................... P PCB soldering pins 0.5 ∞ 1.0 mm (option) ...................... Y 1 R-Control excludes option P and vice versa. Example: PSA 121.5-7iPY = A positive switching regulator with a 12 V, 1.5 A output, ambient temperature range of –25…71°C, inhibit input, potentiometer and small soldering pins. Control circuit Go– Vo+ Gi– Vi+ R i Io U o Ii U i 03016 Ce Option P Fig. 1 Block diagram Functional Description The switching regulators are using the buck converter to- pology. See also: Technical Information: Topologies. The input is not electrically isolated from the output. During the on period of the switching transistor, current is transferred to the output and energy is stored in the output choke in the form of flux. During the off period, this energy forces the current to continue flowing through the output, to the load and back through the freewheeling diode. Regulation is accomplished by varying the on to off duty ratio of the power switch. These regulators are ideal for a wide range of applica- tions, where input to output isolation is not necessary, or where already provided by an external front end (e.g. a transformer with rectifier). To optimise customer’s needs, additional options and accessories are available. |
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