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.

• 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

• Topology
• Boost, Flyback, Forward, Half-Bridge, Push-Pull
• Duty cycle (Max) (%)
• 50
• Supply voltage (Max) (V)
• 40
• UVLO thresholds on/off (V)
• 7.7/6.95
• Features
• Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology, Soft Start, Synchronization Pin
• Operating temperature range (C)
• 0 to 70
• Rating
• Catalog
• Frequency (Max) (kHz)
• 500
• Gate drive (Typ) (A)
• 0.5

UC3846的完整型号有：UC3846DW、UC3846DWTR、UC3846N，以下是这些产品的关键参数及官网采购报价：

UC3846DW，工作温度：0 to 70，封装：SOIC (DW)-16，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UC3846DW的批量USD价格：1.631（1000+）

UC3846DWTR，工作温度：0 to 70，封装：SOIC (DW)-16，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UC3846DWTR的批量USD价格：1.359（1000+）

UC3846N，工作温度：0 to 70，封装：PDIP (N)-16，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网UC3846N的批量USD价格：1.835（1000+）