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

• TRF3705 - 300MHz 至 4GHz 正交调制器
• BQ24740 - bq24740
• TPS61258 - 采用芯片级封装的 3.5MHz 高效升压转换器
• TPS3838K33-Q1 - 具有 10ms/200ms 可选择延迟时间的汽车类 220nA 监控器
• CDC208 - 5V 双路 1 至 4 时钟驱动器
• LMZ22008 - 具有 20V 最大输入电压和电流共享的 8A SIMPLE SWITCHER? 电源模块
• LM3370 - 具有动态电压调节功能的双路同步降压 DC-DC 转换器
• ADS62P22 - 具有可选 DDR LVDS 或 CMOS 输出的双路 12 位 65MSPS ADC
• TMS320C5504 - 定点数字信号处理器
• SN54LS90 - 十进制计数器