UC1846 电流模式 PWM 控制器 | 德州仪器 TI.com.cn

UC1846 (正在供货)

电流模式 PWM 控制器

电流模式 PWM 控制器 - UC1846
数据表
 

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 PWM控制器和谐振控制器

 
Topology
Control Method
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Features
Rating
Operating Temperature Range (C)
Pin/Package
UC1846
Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Current    
500    
7.7/6.95    
50    
0.5    
Error Amplifier
Soft Start
Synchronization Pin
Multi-topology    
Military    
-55 to 125    
16CDIP
20LCCC