Product Summary

The UCC2804N is an Economy Primary Side Controller. It contains all the control and drive circuitry required for off-line and isolated DC-to-DC fixed frequency current mode switching power supplies with minimal external parts count. Internally implemented circuits of the UCC2804N include undervoltage lockout featuring startup current less than 100μA, a user accessible voltage reference, logic to ensure latched operation, a PWM comparator, and a totem pole output stage to sink or source peak current. The output stage of the UCC2804N1, suitable for driving N-Channel MOSFETs, is low in the off state.

Parametrics

UCC2804N absolute maximum ratings: (1)VDD: 19V; (2)IVDD: 25mA; (3)IOUT (tpw < 1μs and Duty Cycle < 10%): –0.4A to 0.8A; (4)RT1, RT2, SS: –0.3V to REF + 0.3V; (5)IREF: –15mA; (6)Storage Temperature: –65℃ to +150℃; (7)Junction Temperature: –55℃ to +150℃; (8)Lead Temperature (Soldering, 10 sec.): +300℃.

Features

UCC2804N features: (1)User Programmable Soft Start With Active Low Shutdown; (2)User Programmable Maximum Duty Cycle; (3)Accessible 5V Reference; (4)Undervoltage Lockout; (5)Operation to 1MHz; (6)0.4A Source/0.8A Sink FET Driver; (7)Low 100μA Startup Current.

Diagrams

UCC2804N diagram

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