UCC28C44DGKR Texas Instruments 开关控制器 BiCMOS Low-Power Current Mode

1 Features

1• Enhanced Replacement for UCx84x and

UCx84xA Family With Pin-to-Pin Compatibility

• 1-MHz Operation

• 50-μA Standby Current, 100-μA Maximum

• Low Operating Current of 2.3 mA at 52 kHz

• Fast 35-ns Cycle-by-Cycle Over-Current Limiting

• ±1-A Peak Output Current

• Rail-to-Rail Output Swings with 25-ns Rise and

20-ns Fall Times

• ±1% Initial Trimmed 2.5-V Error Amplifier

Reference

• Trimmed Oscillator Discharge Current

• New Undervoltage Lockout Versions

• VSSOP-8 Package Minimizes Board Space

2 Applications

• Switch-Mode Power Supplies

• General Purpose DC-DC or Off-Line Isolated

Power Converters

• Board Mount Power Modules

3 Description

UCCx8C4x family are high-performance, currentmode

PWM controllers. The UCCx8C4x is an

enhanced BiCMOS version with pin-for-pin

compatibility to the industry standard UCx84xA family

and UCx84x family of PWM controllers. The BiCMOS

technology offers lower power consumption to

improve efficiency as well as faster current sense and

oscillator frequency. In addition, lower startup voltage

versions of 7 V are offered as UCCx8C40 and

UCCx8C41 for use in battery systems. The

UCC28C4x series is specified for operation from

–40°C to 105°C, and the UCC38C4x series is

specified for operation from 0°C to 70°C.