Technology Industry
Industry: Email Alert RSS FeedSwitched-mode power-supply IC integrates switch, controller, and self protection. (Power Integrations Inc. introduces PWR-SMP3 circuit) (product announcement)
EDN, May, 1990 by Swager, Anne Watson
Switched-mode power-supply IC integrates switch, controller, and self protection In addition to CMOS analog and digital power-supply control, the PWR-SMP3 integrates a 350V power MOSFET switch. Using this device, you can design a 3W, offline, switching power supply into a very small space. The 16-pin DIP and external components, which include a bridge rectifier, a transformer, and input and output capacitors, can fit in a 1/2-in. (3) space.
The IC operates over an input range of 90 to 140V ac and 36 to 200V dc. The turns ratio of your transformer will determine the output voltage of the supply. Dependeing on current and temperature conditions, the power MOSFET's on-residence is typically 14 to 28[Omega]. At a drain voltage of 25V, the output capacitance...
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