Texas Instruments UCC28C45

Description

UCC38C4x family is a high-performance current-mode PWM controller. It is an enhanced BiCMOS version with pin-for-pin compatibility to the industry standard UC384xA family and UC384x family of PWM controllers. In addition, lower startup voltage versions of 7 V are offered as UCC38C40 and UCC38C41.

Providing necessary features to control fixed frequency, peak current-mode power supplies, this family offers the following performance advantages. The device offers high-frequency operation up to 1 MHz with low start-up and operating currents, thus minimizing start-up loss and low operating power consumption for improved efficiency. The device also features a very fast current-sense-to-output delay time of 35 ns and a ±1 A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.

The UCC38C4x family is offered in 8-pin packages, MSOP (DGK), SOIC (D) and PDIP (P).

Features

• Enhanced Replacement for UC3842A Family With Pin-to-Pin Compatibility
• 1-MHz Operation
• 50-µA Start-Up Current, 100-µA Maximum
• Low Operating Current of 2.3 mA at 52 kHz
• Fast 35-ns Cycle-by-Cycle Overcurrent 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 Under Voltage Lockout Versions
• MSOP-8 Package Minimizes Board Space

Typical applications

• dc-to-dc Converters
• Switch-Mode Power Supplies
• Board Mount Power Modules

More information

• Datasheet
• IC product information