DESCRIPTION

· The UCCx808A devices are a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators designed for off-line or DC-to-DC fixed frequency current-mode switching power supplies with minimal external parts count.

· The dual-output drive stages are arranged in a push-pull configuration, switching at half the oscillator frequency with a typical dead time of 60ns to 200ns.

· Enhanced versions feature an internal discharge transistor from the CS pin to ground, activated each clock cycle during the oscillator dead time, minimizing filter capacitor values and current sense delay.

FEATURES

· Dual-Output Drive Stages in Push-Pull Configuration.

· Current-Sense Discharge Transistor to Improve Dynamic Response.

· 130-μA Typical Starting Current and 1-mA Typical Run Current.

· Operation up to 1MHz with Internal Soft Start.

· On-Chip Error Amplifier with 2-MHz Gain Bandwidth Product and On-Chip VDD Clamping.

· Output Drive Stages Capable of 500-mA Peak-Source Current, 1-A Peak-Sink Current.

APPLICATIONS

· High-Efficiency Switch-Mode Power Supplies.

· Telecom DC-to-DC Converters.

· Point-of-Load Power Modules.

· Low-Cost Push-Pull and Half-Bridge Applications.