UCC38C44中文资料工作温度范围为 0°C 至 70°C、具有 14.5V/9V UVLO 50% 占空比的 20V、1A、低电流 1MHz 电流模式 PWM 控制器数据手册TI规格书

描述 Description

UCCx8C4x family are high-performance, current-mode 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. 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, suitable for high speed applications. The trimmed discharge current enables more precise programming of the maximum duty cycle and dead-time limit when compared to the UCx84x family. Reduced start-up and operating currents minimizes start-up loss and low operating power consumption for improved efficiency. The device also features a fast current-sense-to-output delay time of 35 ns for superior overload protection at the power switch, 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 VSSOP (DGK), 8-pin SOIC (D), and 8-pin PDIP (P) packages.

特性 Features

• 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

简介

UCC38C44属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由TI制造生产的UCC38C44DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。