Product details

Topology Boost, Flyback, Forward Duty cycle (Max) (%) 100 Supply voltage (Max) (V) 25 UVLO thresholds on/off (V) 8.4/7.6 Features Error Amplifier, Multi-topology Operating temperature range (C) -55 to 125 Rating Military Frequency (Max) (kHz) 500 Gate drive (Typ) (A) 1
Topology Boost, Flyback, Forward Duty cycle (Max) (%) 100 Supply voltage (Max) (V) 25 UVLO thresholds on/off (V) 8.4/7.6 Features Error Amplifier, Multi-topology Operating temperature range (C) -55 to 125 Rating Military Frequency (Max) (kHz) 500 Gate drive (Typ) (A) 1
CDIP (JG) 8 64 mm² 9.6 x 6.67 LCCC (FK) 20 79 mm² 8.89 x 8.89
  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • 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 500-kHz Operation
  • Create a Custom Design Using the UCx84xA With the WEBENCH® Power Designer
  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • 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 500-kHz Operation
  • Create a Custom Design Using the UCx84xA With the WEBENCH® Power Designer

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

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Technical documentation

Design & development

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Simulation model

UC1843A-SP Unencrypted PSpice Transient Model

SLUM660.ZIP (3 KB) - PSpice Model
Simulation model

UC1843A-SP PSpice Transient Model

SLUM661.ZIP (105 KB) - PSpice Model
Package Pins Download
CDIP (JG) 8 View options
LCCC (FK) 20 View options

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