TI Texas Instruments UCC2808A-1Q1 Data Sheet Manual

SGLS183 − AUGUST 2003

Qualification in Accordance With On-Chip Error Amplifier With 2-MHz Gain AEC-Q100† Bandwidth Product Qualified for Automotive Applications On Chip VDD Clamping Customer-Specific Configuration Control Output Drive Stages Capable of 500-m A Can Be Supported Along With Peak-Source Current, 1-A Peak-Sink Major-Change Approval Current

D PACKAGE

ESD Protection Exceeds 1500 V Per

(TOP VIEW)

MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 p F, R = 0)

COMP VDD

Dual Output Drive Stages in Push-Pull

FB OUTA

Configuration OUTB

RC GND

Current Sense Discharge Transistor to Improve Dynamic Response 130-µA Typical Starting Current

PW PACKAGE

1-m A Typical Run Current (TOP VIEW) Operation to 1 MHz

OUTA OUTB

Internal Soft Start

VDD GND

Contact factory for details. Q100 qualification data available on COMP

request.

FB CS

description The UCC2808A is a family of Bi CMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC2808A 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 UCC2808A 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 UCC2808A family offers a variety of package options and choice of undervoltage lockout levels. The family has UVLO thresholds and hysteresis options for off-line and battery powered systems. Thresholds are shown in the ordering information table. The UCC2808A is an enhanced version of the UCC2808 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 each cycle and helps minimize filter capacitor values and current sense delay.

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