The UC1843 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state. The under-voltage lockout threshold is 8.4 V and maximum duty cycle range is around 100%.

• 55°C to 125°C Known Good Die
• Controlled Baseline
• Optimized For Off-line and DC-to-DC Converters
• Low Start-Up Current (<1 mA)
• Automatic Feed Forward Compensation
• Pulse-by-Pulse Current Limiting
• Enhanced Load Response Characteristics
• Under-Voltage Lockout With Hysteresis
• Double Pulse Suppression
• High Current Totem Pole Output
• Internally Trimmed Bandgap Reference
• 500-kHz Operation
• Low RO Error Amp

• Topology
• Boost, Flyback, Forward
• Duty cycle (Max) (%)
• 100
• Supply voltage (Max) (V)
• 30
• UVLO thresholds on/off (V)
• 8.4/7.6
• Features
• Error Amplifier, Multi-topology
• Operating temperature range (C)
• -55 to 125
• Rating
• Military
• Frequency (Max) (kHz)
• 500
• Gate drive (Typ) (A)
• 1

UC1843-HIREL的完整型号有：UC1843MKGD1，以下是这些产品的关键参数及官网采购报价：

UC1843MKGD1，工作温度：-55 to 125，封装： (KGD)-0，包装数量MPQ：100个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：Call TI，TI官网UC1843MKGD1的批量USD价格：215.292（1000+）