UC3841 - 可编程脱机 PWM 控制器

UC3841是TI德州仪器公司的一款PWM与谐振控制器产品，UC3841是可编程脱机 PWM 控制器，本站介绍了UC3841的封装应用图解、特点和优点、功能等，并给出了与UC3841相关的TI元器件型号供参考。

UC3841 - 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 UC1841 family of PWM controllers has been designed to increase the level of versatility while retaining all of the performance features of the earlier UC1840 devices. While still optimized for highly-efficient boot-strapped primary-side operation in forward or flyback power converters, the UC1841 is equally adept in implementing both low and high voltage input DC to DC converters. Important performance features include a low-current starting circuit, linear feed-forward for constant volt-second operation, and compatibility with either voltage or current mode topologies.

In addition to start-up and normal regulating PWM functions, these devices include built in protection from over-voltage, under-voltage, and over-current fault conditions with the option for either latch-off or automatic restart.

While pin compatible with the UC1840 in all respects except that the polarity of the External Stop has been reversed, the UC1841 offers the following improvements:

1. Fault latch reset is accomplished with slow start discharge rather than recycling the input voltage to the chip.

2. The External Stop input can be used for a fault delay to resist shutdown from short duration transients.

3. The duty-cycle clamping function has been characterized and specified.

The UC1841 is characterized for -55°C to +125°C operation while the UC2841 and UC3841 are designed for -25°C to +85°C and 0°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
Guaranteed Duty Cycle Clamp
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
PWM Output Switch Usable to 1A Peak Current
1% Reference Accuracy
500kHz Operation
18 Pin DIL Package

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