UC2833中文资料具有 -40°C 至 +85°C 工作温度范围的 450mA、36V 线性控制器数据手册TI规格书

描述 Description

The UC2832 and UC3833 series of precision linear regulators include all the control functions required in the design of very low dropout linear regulators. Additionally, they feature an innovative duty-ratio current limiting technique which provides peak load capability while limiting the average power dissipation of the external pass transistor during fault conditions. When the load current reaches an accurately programmed threshold, a gated-astable timer is enabled, which switches the regulator’s pass device off and on at an externally programmable duty-ratio. During the on-time of the pass element, the output current is limited to a value slightly higher than the trip threshold of the duty-ratio timer. The constant-current-limit is programmable on the UCx832 to allow higher peak current during the on-time of the pass device. With duty-ratio control, high initial load demands and short circuit protection may both be accommodated without extra heat sinking or foldback current limiting. Additionally, if the timer pin is grounded, the duty-ratio timer is disabled, and the IC operates in constant-voltage/constant-current regulating mode.

These IC’'s include a 2 Volt (±1%) reference, error amplifier, UVLO, and a high current driver that has both source and sink outputs, allowing the use of either NPN or PNP external pass transistors. Safe operation is assured by the inclusion of under-voltage lockout (UVLO) and thermal shutdown.

The UC3833 family includes the basic functions of this design in a low-cost, 8-pin mini-dip package, while the UC2832 series provides added versatility with the availability of 14 pins. Packaging options include plastic (N suffix), or ceramic (J suffix). Specified operating temperature ranges are: commercial (0°C to 70°C), order UC3832/3 (N or J); and industrial (–40°C to 85°C), order UC2832/3 (N or J). Surface mount packaging is also available.

特性 Features

• Precision 1% Reference
• Over-Current Sense Threshold Accurate to 5%
• Programmable Duty-Ratio Over-Current Protection
• 4.5 V to 36 V Operation
• 100mA Output Drive, Source, or Sink
• Under-Voltage Lockout
• Additional Features of the UC2832 series:
• Adjustable Current Limit to Current Sense Ratio
• Separate +VIN terminal
• Programmable Driver Current Limit
• Access to VREF and E/A(+)
• Logic-Level Disable Input

简介

UC2833属于集成电路（IC）的线性稳压器。由TI制造生产的UC2833稳压器 - 线性稳压器控制器线性电压调节是指使用与负载串联的旁路元件（通常是双极型或场效应晶体管）以及对应的驱动控制电路，以在负载两端产生恒定的标称电压，负载通常对电路的电源电压变化或负载电流不敏感。该系列中的产品提供与外部旁路元件配合使用所必需的控制功能，从而将其与集成线性稳压器区分开来，后者将旁路元件与控制电路整合在单个器件封装中。