The UCC35701/UCC35702 family of pulse width modulators is intended for isolated switching power supplies using primary side control. They can be used for both off-line applications and DC/DC converter designs such as in a distributed power system architecture or as a telecom power source.

The devices feature low startup current, allowing for efficient off-line starting, yet have sufficient output drive to switch power MOSFETs in excess of 500kHz.

Voltage feed forward compensation is operational over a 5:1 input range and provides fast and accurate response to input voltage changes over a 4:1 range. An accurate volt-second clamp and maximum duty cycle limit are also featured.

Fault protection is provided by pulse by pulse current limiting as well as the ability to latch off after a programmable number of repetitive faults has occurred.

Two UVLO options are offered. UCC35701 family has turn-on and turn-off thresholds of 13V/9V and UCC35702 family has thresholds of 9.6V/8.8V.

The UCC35701/2 and the UCC25701/2 are offered in the 14 pin SOIC (D), 14 pin PDIP (N) or in 14 pin TSSOP (PW) packages. The UCC15701/2 is offered in the 14 pin CDIP (J) package.

• 700kHz Operation
• Integrated Oscillator/Voltage Feed Forward Compensation
• Accurate Duty Cycle Limit
• Accurate Volt-second Clamp
• Optocoupler Interface
• Fault Counting Shutdown
• Fault Latch off or Automatic Shutdown
• Soft Stop Optimized for Synchronous Rectification
• 1A Peak Gate Drive Output
• 130A Start-up Current
• 750A Operating Current

• Topology
• Boost, Flyback, Forward
• Duty cycle (Max) (%)
• 99
• Supply voltage (Max) (V)
• 15
• UVLO thresholds on/off (V)
• 13/9
• Features
• Adjustable Switching Frequency, Current Limiting, Multi-topology, Programmable Max Duty Cycle, Soft Start, Synchronization Pin
• Operating temperature range (C)
• -40 to 85
• Rating
• Catalog
• Frequency (Max) (kHz)
• 700
• Gate drive (Typ) (A)
• 1

UCC25701的完整型号有：UCC25701D、UCC25701DTR、UCC25701N、UCC25701PW，以下是这些产品的关键参数及官网采购报价：

UCC25701D，工作温度：-40 to 85，封装：SOIC (D)-14，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网UCC25701D的批量USD价格：4.103（1000+）

UCC25701DTR，工作温度：-40 to 85，封装：SOIC (D)-14，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网UCC25701DTR的批量USD价格：3.481（1000+）

UCC25701N，工作温度：-40 to 85，封装：PDIP (N)-14，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UCC25701N的批量USD价格：4.569（1000+）

UCC25701PW，工作温度：-40 to 85，封装：TSSOP (PW)-14，包装数量MPQ：90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UCC25701PW的批量USD价格：4.165（1000+）