The TL284x and TL384x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator (that 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 when it is in the off state.

• 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
• Undervoltage Lockout With Hysteresis
• Double-Pulse Suppression
• High-Current Totem-Pole Output
• Internally Trimmed Bandgap Reference
• 500-kHz Operation
• Error Amplifier With Low Output Resistance
• Designed to be Interchangeable with UC2842 and UC3842 Series

• Topology
• Flyback, Boost,
• Duty cycle (Max) (%)
• 100
• Supply voltage (Max) (V)
• 30
• UVLO thresholds on/off (V)
• 8.4/7.6
• Features
• Adjustable Switching Frequency, Current Limiting, Error Amplifier, Multi-topology
• Operating temperature range (C)
• 0 to 70
• Rating
• Catalog
• Frequency (Max) (kHz)
• 500
• Gate drive (Typ) (A)
• 1

TL3843的完整型号有：TL3843D、TL3843D-8、TL3843DR、TL3843DR-8、TL3843P，以下是这些产品的关键参数及官网采购报价：

TL3843D，工作温度：0 to 70，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TL3843D的批量USD价格：.336（1000+）

TL3843D-8，工作温度：0 to 70，封装：SOIC (D)-8，包装数量MPQ：75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TL3843D-8的批量USD价格：.336（1000+）

TL3843DR，工作温度：0 to 70，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TL3843DR的批量USD价格：.246（1000+）

TL3843DR-8，工作温度：0 to 70，封装：SOIC (D)-8，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TL3843DR-8的批量USD价格：.209（1000+）

TL3843P，工作温度：0 to 70，封装：PDIP (P)-8，包装数量MPQ：50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TL3843P的批量USD价格：.25（1000+）