Datasheet > UC2841L

UC2841L

更新时间： 2024-11-03 23:38:55

品牌	Logo	应用领域
其他 - ETC		开关控制器
页数	文件大小	规格书
9页	955K
描述
Current/Voltage-Mode SMPS Controller

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数据手册

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UC2841L 数据手册

UC1841

UC2841

UC3841

Programmable, Off-Line, PWM Controller

FEATURES

DESCRIPTION

•

All Control, Driving, Monitoring, and

Protection Functions Included

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.

•

Low-current, Off-line Start Circuit

Voltage Feed Forward or Current

Mode Control

•

Guaranteed Duty Cycle Clamp

PWM Latch for Single Pulse per Period

In addition to start-up and normal regulating PWM functions, these de-

vices include built in protection from over-voltage, under-voltage, and

over-current fault conditions with the option for either latch-off or automat-

ic restart.

Pulse-by-Pulse Current Limiting Plus

Shutdown for Over-Current Fault

•

No Start-up or Shutdown Transients

While pin compatible with the UC1840 in all respects except that the po-

larity of the External Stop has been reversed, the UC1841 offers the fol-

lowing improvements:

Slow Turn-on Both Initially and After

Fault Shutdown

•

Shutdown Upon Over- or

Under-Voltage Sensing

1. Fault latch reset is accomplished with slow start discharge rather

than recycling the input voltage to the chip.

Latch Off or Continuous Retry After

Fault

2. The External Stop input can be used for a fault delay to resist

shutdown from short duration transients.

PWM Output Switch Usable to 1A

Peak Current

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

specified.

•

1% Reference Accuracy

500kHz Operation

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.

18 Pin DIL Package

BLOCK DIAGRAM

Note: Positive true logic, latch outputs high with set, reset has priority.

6/93

12 3 4 5 6 7...9

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