UC3851 - 可编程脱机 PWM 控制器

UC3851是TI德州仪器公司的一款PWM与谐振控制器产品，UC3851是可编程脱机 PWM 控制器，本站介绍了UC3851的封装应用图解、特点和优点、功能等，并给出了与UC3851相关的TI元器件型号供参考。

UC3851 - 可编程脱机 PWM 控制器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

The UC1851 family of PWM controllers are optimized for off-line primary side control. These devices include a high current totem pole output stage and a toggle flip-flop for absolute 50% duty cycle limiting. In all other respects this line of controllers is pin for pin compatible with the UC1841 series. Inclusion of all major housekeeping functions in these high performance controllers makes them ideal for use in cost sensitive applications.

Important features of these controllers include low current start-up, linear feed-forward for constant volt-second operation, and compatibility with both voltage or current mode control. In addition, these devices include a programmable start threshold, as well as programmable over-voltage, under-voltage, and over current fault thresholds. The fault latch on these devices can be configured for automatic restart, or latched off response to a fault.

These devices are packaged in 18-pin plastic or ceramic dual-in-line packages, or for surface mount applications, a 20 Pin PLCC. The UC1851 is characterized for -55°C to +125°C operation while the UC2851 and UC3851 are designed for -40°C to +85°C and 0°C to +70°C, respectively.

产品特性

All Control, Driving, Monitoring, and Protection Functions Included
Low-Current Off Line Start Circuit
Voltage Feed Forward or Current Mode Control
High Current Totem Pole Output
50% Absolute Max Duty Cycle
PWM Latch for Single Pulse Per Period
Pulse-by-Pulse Current Limiting plus Shutdown for Over-Current Fault
No Start-Up or Shutdown Transients
Slow Turn-On Both Initially and After Fault Shutdown
Shutdown Upon Over or Under Voltage Sensing
Latch Off or Continuous Retry After Fault
1% Reference Accuracy
500kHz Operation
18 Pin DIL or 20 Pin PLCC Package

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