UC2841 可编程脱机 PWM 控制器_BDTIC代理TI 德州仪器UC2841

UC2841 可编程脱机 PWM 控制器

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.

	UC2841
Topology	Boost, Buck, Flyback, Forward
Control Method	Current,Voltage
Duty Cycle (Max) (%)	95
Frequency (Max) (kHz)	450
UVLO Thresholds On/Off (V)	8/7.8
Pin/Package	18PDIP, 18SOIC
Approx. Price (US$)	7.20 \| 1ku
Vin (Min) (V)	8
Vin (Max) (V)	32
Regulated Outputs (#)	1
Operating Temperature Range (C)	-20 to 85
Rating	Military

UC2841 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

UC2841 芯片订购指南

器件	状态	温度 (oC)	价格（美元）	封装 \| 引脚	封装数量 \| 封装载体	丝印标记
UC2841DW	ACTIVE	-20 to 85	7.20 \| 1ku	SOIC (DW) \| 18	40 \| TUBE
UC2841DWG4	ACTIVE	-20 to 85	7.20 \| 1ku	SOIC (DW) \| 18	40 \| TUBE
UC2841N	ACTIVE	-20 to 85	7.20 \| 1ku	PDIP (N) \| 18	20 \| TUBE
UC2841NG4	ACTIVE	-20 to 85	7.20 \| 1ku	PDIP (N) \| 18	20 \| TUBE

UC2841 质量与无铅数据

器件	环保计划*	铅/焊球涂层	MSL 等级/回流焊峰	环保信息与无铅 (Pb-free)	DPPM / MTBF / FIT 率
UC2841DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	UC2841DW	UC2841DW
UC2841DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	UC2841DWG4	UC2841DWG4
UC2841N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	UC2841N	UC2841N
UC2841NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	UC2841NG4	UC2841NG4

UC2841 工具与软件

培训内容	型号	软件/工具类型
最常用开关模式电源的功率级设计器	POWERSTAGE-DESIGNER	分析软件