UCC38C45 Datasheet | Texas Instruments

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45, UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45 SLUS458I - JULY 2000 - REVISED JUNE 2024 UCCx8C4x Bi CMOS Low-Power Current-Mode PWM Controller 1 Features - Enhanced replacement for UCx84x and UCx84x A family with pin-to-pin patibility - Operating frequency: 1MHz Maximum - 50μA Startup Current, 100μA Maximum - Low operating current: 2.3m A (at f OSC = 52k Hz) - Fast, cycle-by-cycle overcurrent limiting: 35ns - Peak driving current: ±1A. Rail-to-rail output: - 25ns rise time - 20ns fall time - ±1% accurate 2.5V error amplifier reference - Trimmed oscillator discharge current - Undervoltage lockout protections - VSSOP-8 package minimizes board space 2 Applications - Switch-mode power supplies - General purpose single-ended DC-DC or off-line isolated power converters - Board mount power modules 3 Description The UCCx8C4x family are high-performance, current-mode PWM controllers. The UCCx8C4x is an enhanced Bi CMOS version with pin-for-pin patibility to the industry standard UCx84x A family and UCx84x family of PWM controllers. The Bi CMOS technology offers lower power consumption to improve efficiency as well as faster current sense and oscillator frequency. In addition, lower startup voltage versions of 7V are offered as UCCx8C40 and UCCx8C41 for use in battery systems. The UCC28C4x series is specified for operation from - 40°C to 125°C, and the UCC38C4x series is specified for operation from 0°C to 85°C. 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 1MHz, suitable for high speed applications. The trimmed discharge current enables more precise programming of the maximum duty cycle and deadtime limit when pared to the UCCx8C4x family. Reduced start-up and operating currents minimizes start-up loss and low operating power consumption for...