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UCC3808A-2

Texas Instruments
Part Number UCC3808A-2
Manufacturer Texas Instruments
Published Sep 26, 2019
Description Low-Power Current-Mode Push-Pull PWM
Detailed Description Product Folder Order Now Technical Documents Tools & Software
Datasheet PDF File UCC3808A-2 PDF File

UCC3808A-2
UCC3808A-2


Overview
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 variety of package options, temperature range options, and choice of undervoltage lockout levels.
The family has UVLO thresholds and hysteresis options for off-line and battery-powered systems.
The UCCx808A is an enhanced version of the UCC3808 family.
The significant difference is that the A versions feature an internal discharge transistor from the CS pin to ground, which is activated each clock cycle during the oscillator dead time.
The feature discharges any filter capacitance on the CS pin during...


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