The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

The difference between members of this family are shown in the table below.

• Extended Temperature Performance of –40°C to 125°C
• Optimized for Off-line and DC to DC Converters
• Low Start Up Current (<0.5 mA)
• Trimmed Oscillator Discharge Current
• 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

• TPS76733-EP - 增强型产品快速瞬态响应 1A 低压降稳压器
• LM2853 - 3A 550 kHz 同步 SIMPLE SWITCHER? 降压稳压器
• LM137JAN - 3-Terminal Adjustable Negative Regulator
• SN54ALS112A - 具有清零和预设功能的双路 J-K 下降沿触发器
• SN74AUC1G07 - 具有漏极开路输出的单路缓冲器/驱动器
• CF4320H - 具有 ESD 保护、转换和卡片检测电路的 CompactFlash 总线接口芯片
• ADS8548 - 14 位、8 通道、同步采样、双极性输入 ADC
• CD4035B-MIL - CMOS 4 级并行输入/并行输出移位寄存器
• TMS320F28069 - Piccolo 微处理器
• TPS62293 - 采用 2x2mm SON 封装的 2.25MHz 1A 降压转换器