UC1843 电流模式 PWM 控制器_BDTIC代理TI 德州仪器UC1843

UC1843 电流模式 PWM 控制器

The UC1842/3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.

Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges

	UC1843
Topology	Boost, Flyback, Forward
Control Method	Current
Duty Cycle (Max) (%)	100
Frequency (Max) (kHz)	450
UVLO Thresholds On/Off (V)	8.4/7.6
Pin/Package	14CFP, 20LCCC, 8CDIP
Vin (Min) (V)	7.6
Vin (Max) (V)	30
Regulated Outputs (#)	1
Operating Temperature Range (C)	-55 to 125
Rating	Military

UC1843 特性

Optimized For Off-line and DC-to-DC Converters
Low Start-Up Current (<1 mA)
Automatic Feed ForwardCompensation
Pulse-by-Pulse Current Limiting
Enhanced Load Response Characteristics
Under-Voltage Lockout With Hysteresis
Double Pulse Suppression
High Current Totem Pole Output
Internally Trimmed Bandgap Reference
500-kHz Operation
Low RO Error Amp

UC1843 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
5962-8670402PA	ACTIVE	-55 to 125	6.88 \| 100u	CDIP (JG) \| 8	1 \| TUBE
5962-8670402XA	ACTIVE	-55 to 125	14.41 \| 100u	LCCC (FK) \| 20	1 \| TUBE
UC1843J	ACTIVE	-55 to 125	4.13 \| 100u	CDIP (JG) \| 8	1 \| TUBE
UC1843J883B	ACTIVE	-55 to 125	6.88 \| 100u	CDIP (JG) \| 8	1 \| TUBE
UC1843L	ACTIVE	-55 to 125	10.43 \| 100u	LCCC (FK) \| 20	1 \| TUBE
UC1843L883B	ACTIVE	-55 to 125	14.41 \| 100u	LCCC (FK) \| 20	1 \| TUBE
UC1843W	ACTIVE	-55 to 125	10.74 \| 100u	CFP (W) \| 14	1 \| TUBE

UC1843 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
5962-8670402PA	TBD	Call TI	Call TI	5962-8670402PA	5962-8670402PA
5962-8670402XA	TBD	Call TI	Call TI	5962-8670402XA	5962-8670402XA
UC1843J	TBD	A42	N/A for Pkg Type	UC1843J	UC1843J
UC1843J883B	TBD	A42	N/A for Pkg Type	UC1843J883B	UC1843J883B
UC1843L	TBD	POST-PLATE	N/A for Pkg Type	UC1843L	UC1843L
UC1843L883B	TBD	POST-PLATE	N/A for Pkg Type	UC1843L883B	UC1843L883B
UC1843W	TBD	A42	N/A for Pkg Type	UC1843W	UC1843W

UC1843 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