[SYSTEM GENERAL]

DESCRIPTION

The SG348xG series of current-mode PWM controllers combines high performance with Green-mode power saving features. SG348xG controllers are fully pin-to-pin compatible with bipolar UC384x devices, but they have improved features and functionality. SG384xG series controllers are compatible with the BiCMOS fabrication process, enabling the use of low start-up current and operating currents. This feature further improves power conversion efficiency. The minimal start-up current has been reduced to 5uA, and the minimum operating current has been reduced to 5mA.

Each SG384xG has a slew rate controlled high current totem pole output, ideally suited for driving a power MOSFET while keeping EMI low.

FEATURES

384x series pin-to-pin compatible

Linearly decreasing PWM frequency

Burst-mode at low/zero load

5uA start-up current

5mA operating current

Vcc over voltage protection

Cycle-by-cycle current limiting

Zero cross-conduction

Slew rate controlled high current totem pole output

Fast current sense propagation delay

Under voltage lockout (UVLO) with hysteresis

APPLICATIONS

Switching mode power supplies

Power converters