UC1843-HIREL 电流模式 PWM 控制器 | 德州仪器 TI.com.cn

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电流模式 PWM 控制器

电流模式 PWM 控制器 - UC1843-HIREL


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


与其它产品相比 PWM控制器和谐振控制器 邮件 下载到电子表格中
Part number 立即下单 Topology Control method VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) UVLO thresholds on/off (V) Duty cycle (Max) (%) Gate drive (Typ) (A) Features Rating Operating temperature range (C)
UC1843-HIREL 立即下单 Boost
Current     8.5     30     500     8.4/7.6     100     1     Error Amplifier
HiRel Enhanced Product     -55 to 125