UC3856中文资料工作温度范围为 0°C 至 70°C 的 40V、1.5A 电流模式 1MHz PWM 控制器数据手册TI规格书

描述 Description

The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs. A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.Internal chip grounding has been improved to minimize internal \\x93noise\\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity. Other features include a trimmed oscillator current (8%) for accurate frequency and dead time control; a 1V, 5% shutdown threshold; and 4kV minimum ESD protection on all pins.

特性 Features

• Pin-for-Pin Compatible With the UC3846
• 65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs
• Improved Current Sense Amplifier With Reduced Noise Sensitivity
• Differential Current Sense with 3V Common Mode Range
• Trimmed Oscillator Discharge Current for Accurate Deadband Control
• Accurate 1V Shutdown Threshold
• High Current Dual Totem Pole Outputs (1.5A peak)
• TTL Compatible Oscillator SYNC Pin Thresholds
• 4kV ESD Protection

简介

UC3856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UC3856DC-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。