UCC2808A-2

Product Folder Order Now Technical Documents Tools & Software Support & Community Reference Design UCC2808A-1, UCC2808A-2, UCC3808A-1, UCC3808A-2 SLUS456F – APRIL 1999 – REVISED JULY 2018 UCCx808A Low-Power Current-Mode Push-Pull PWM 1 Features 1 Dual-Output Drive Stages in Push-Pull Configuration Current-Sense Discharge Transistor to Improve Dynamic Response 130-μA Typical Starting Current 1-mA Typical Run Current Operation to 1 MHz Internal Soft Start On-Chip Error Amplifier With 2-MHz Gain Bandwidth Product On-Chip VDD Clamping Output Drive Stages Capable of 500-mA Peak- Source Current, 1-A Peak-Sink Current 2 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 3 Description The UCCx808A devices are a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCCx808A contains all of the control and drive circuitry required for off-line or DC-to-DC fixed frequency current-mode switching power supplies with minimal external parts count. The UCCx808A dual-output drive stages are arranged in a push-pull configuration. Both outputs switch at half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 60 ns to 200 ns depending on the values of the timing capacitor and resistors, thus limiting each output stage duty cycle to less than 50%. The UCCx808A family offers a variet...