电流模式 PWM 控制器 - UC1846

UC1846 (正在供货)

电流模式 PWM 控制器

 

描述

The UC1846/7 family of control devices provides all of the necessary features to implement fixed-frequency, current-mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel while maintaining equal current sharing. \

Protection circuitry includes built-in undervoltage lockout and programmable current limit, in addition to soft-start capability. A shutdown function is also available, which can initiate either a complete shutdown with automatic restart or latch the supply off.

Other features include fully-latched operation, double-pulse suppression, deadline adjust capability, and a ±1% trimmed band gap reference.

The UC1846 features low outputs in the OFF state, while the UCx847 features high outputs in the OFF state.

特性

  • Automatic Feedforward Compensation
  • Programmable Pulse-by-Pulse Current Limiting
  • Automatic Symmetry Correction in Push-Pull
    Configuration
  • Enhanced Load Response Characteristics
  • Parallel Operation Capability for Modular Power
    Systems
  • Differential Current Sense Amplifier with Wide
    Common Mode Range
  • Double-Pulse Suppression
  • 500-mA (Peak) Totem-pole Outputs
  • ±1% Band Gap Reference
  • Undervoltage Lockout
  • Soft-Start Capability
  • Shutdown Terminal
  • 500-kHz Operation

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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)
UC1846 UC2846 UC3846
Current    Current    Current   
7    7.7    7   
40    40    40   
Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull   
Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull   
Boost
Flyback
Forward
Half-Bridge
Push-Pull   
50    50    50   
500    500    500   
7.7/6.95    7.7/6.95    7.7/6.95   
Error Amplifier
Soft Start
Synchronization Pin
Multi-topology   
Error Amplifier
Multi-topology
Soft Start
Synchronization Pin   
Error Amplifier
Multi-topology
Soft Start
Synchronization Pin   
Military    Catalog    Catalog   
-55 to 125    -40 to 85    0 to 70   
CDIP
LCCC   
PDIP
SOIC   
PDIP
SOIC   
See datasheet (CDIP)
20LCCC: 79 mm2: 8.89 x 8.89(LCCC)   
See datasheet (PDIP)
16SOIC: 106 mm2: 10.3 x 10.3(SOIC)   
See datasheet (PDIP)
16SOIC: 106 mm2: 10.3 x 10.3(SOIC)   

其它合格版本 UC1846

版本 器件型号 定义
目录 UC3846 TI 的标准目录产品
增强型产品 UC1846-EP 支持国防、航天和医疗应用
宇航 UC1846-SP 抗辐射、陶瓷封装,适用于太空应用