UC1843 (正在供货)

电流模式 PWM 控制器

电流模式 PWM 控制器 - UC1843
数据表
 

描述

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

特性

  • Optimized for Off-Line and DC-to-DC Converters
  • Low Start-Up Current (< 1 mA)
  • Automatic Feedforward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load-Response Characteristics
  • Undervoltage Lockout With Hysteresis
  • Double-Pulse Suppression
  • High-Current Totem-Pole Output
  • Internally Trimmed Bandgap Reference
  • Up to 500-kHz Operation
  • Error Amplifier With Low Output Resistance

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参数 与其它产品相比 离线和隔离式直流/直流控制器和转换器

 
Control Method
Vin (Min) (V)
Vin (Max) (V)
Topology
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
UC1843
Current   
7.6   
30   
Boost
Flyback
Forward   
100   
500   
8.4/7.6   
Error Amplifier
Multi-topology   
Military   
-55 to 125   
CDIP
LCCC   
See datasheet (CDIP)
20LCCC: 79 mm2: 8.89 x 8.89(LCCC)   

其它合格版本 UC1843

版本 器件型号 定义
目录 UC3843 TI 的标准目录产品
宇航 UC1843-SP 抗辐射、陶瓷封装,适用于太空应用

WEBENCH® Designer UC1843

AC 频率  60 Hz  50 Hz
  最小   最大 范围
VinRMS  V 15.0 to 480.0V
输出电压  V 3.3 to 50V
输出电流  A ≤ 20A
环境温度  °C -55 to 125°C