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AC/DC & DC/DC controllers (external FET)
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AC/DC & DC/DC controllers (external FET)
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UC2843L

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36V, 1A, 500KHz current mode PWM controller with 8.4V and 7.6V UVLO 100% duty cycle

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Data sheet

UC2843L

ACTIVE
Data sheet Order now

Product details

Vin (max) (V) 36 Operating temperature range (°C) -40 to 125 Control mode Peak current mode Topology Boost, Buck, Buck boost, Flyback, Forward Rating Catalog Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 100 TI functional safety category Functional Safety-Capable
Vin (max) (V) 36 Operating temperature range (°C) -40 to 125 Control mode Peak current mode Topology Boost, Buck, Buck boost, Flyback, Forward Rating Catalog Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 100 TI functional safety category Functional Safety-Capable
SOIC (D) 8 29.4 mm² 4.9 x 6

  • Improved output driver and lower operating/startup current from UCx84x/UCx84xA/UCx84xAQ/TLx84x/TLx84xB families

  • Optimized for off-line and DC-DC converters
  • Low start-up current (< 0.5mA)
  • Trimmed oscillator discharge current
  • Automatic feedforward 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
  • Up to 500kHz operation

  • Improved output driver and lower operating/startup current from UCx84x/UCx84xA/UCx84xAQ/TLx84x/TLx84xB families

  • Optimized for off-line and DC-DC converters
  • Low start-up current (< 0.5mA)
  • Trimmed oscillator discharge current
  • Automatic feedforward 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
  • Up to 500kHz operation

The UC284xL control device is a pin-for-pin compatible improved version of the UC284x family. Providing the necessary features to control current-mode or switched-mode power supplies, this device provides improved features: higher VCC range at 36V, lower start-up current at 0.25mA, tighter operating current tolerance at 15mA max, and faster response on cycle-by-cycle current protection at 100ns. Output driver of UC284xL is improved with shorter rise and fall time at 75ns max to reduce switching loss, and stronger driver capabilities with lower output low level farther from the FETs threshold voltage.

The UC284xL control device is a pin-for-pin compatible improved version of the UC284x family. Providing the necessary features to control current-mode or switched-mode power supplies, this device provides improved features: higher VCC range at 36V, lower start-up current at 0.25mA, tighter operating current tolerance at 15mA max, and faster response on cycle-by-cycle current protection at 100ns. Output driver of UC284xL is improved with shorter rise and fall time at 75ns max to reduce switching loss, and stronger driver capabilities with lower output low level farther from the FETs threshold voltage.
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* Data sheet UC284xL High-Performance Economy Current-Mode PWM Controller datasheet PDF | HTML 21 Mar 2025

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