STK73904

The STK73904 incorporates on-chip all the power switching, amplifier, overcurrent protection and driver circuits required in a self-excitation type feedback control off-line switching regulator. As a result, it can be used in the design of switching power supplies with minimal number of external components. Furthermore, the adoption of MOSFET power switching elements supports a higher oscillator frequency than that possible with bipolar transistors. This allows smaller pulse transformers and capacitors to be used, making it possible to construct miniature power supply systems.

Features of the STK73904 are:(1)power MOSFET devices; (2)feedback control for high output voltage precision; (3)driver circuit on-chip; (4)overcurrent protection circuit on-chip; (5)pin compatible with all other devices in the same series of devices with 110 to 280W power ratings; (6)higher oscillator freduency allows the use of smaller pulse transformers; (7)IMST substrate acts as an electromagnetic shield, making low-noise designs possible.

The absolute maximum ratings of the STK73904 can be summarized as:(1)operating substrate temperature:115;(2)storage temperature range:-30 to 115;(3)AC input voltage:140V;(4)operating temperature:-10 to 85;(5)maximum output power:210W.The information given herein, including the specifications and dimensions, is subject to change without prior notice to improve product characteristics. Before ordering, purchasers are advised to contact the Sensitron Semiconductor sales department for the latest version of the datasheet(s).In cases where extremely high reliability is required (such as use in nuclear power control, aerospace and aviation, traffic equipment,medical equipment, and safety equipment), safety should be ensured by using semiconductor devices that feature assured safety or by means of users' fail-safe precautions or other arrangement.In no event shall Sensitron Semiconductor be liable for any damages that may result from an accident or any other cause during operation of the user's units according to the datasheet(s). Sensitron Semiconductor assumes no responsibility for any intellectual property claims or any other problems that may result from applications of information, products or circuits described in the datasheets.