Current Mode PWM Controller - UC3843A

UC3843A (ACTIVE)

Current Mode PWM Controller

Recommended alternative parts

  • UCC28700  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Next Generation Current Mode PWM with Primary-Side Regulation for Flyback
  • UCC28710  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Next Generation Current Mode PWM with Primary-Side Regulation for Flyback

Description

The UC1842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC3842/3/4/5 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 0.5mA. Oscillator discharge is trimmed to 8.3mA. During under voltage lockout, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V.

Features

  • Optimized for Off-line and DC to DC Converters
  • Low Start Up Current (<0.5mA)
  • 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
  • 500kHz Operation
  • Low RO Error Amp

View more

Parametrics Compare all products in PWM and Resonant Controller

 
Topology
Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Regulated Outputs (#)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
UC3843A UC1843A UC2843A
Boost
Buck
Flyback
Forward    
Boost
Flyback
Forward    
Boost
Flyback
Forward    
Current     Current     Current    
100     100     100    
450     450     450    
8.4/7.6     8.4/7.6     8.4/7.6    
1     1     1    
Error Amplifier     Error Amplifier     Error Amplifier    
Military     Military     Military    
0 to 70     -55 to 125     -40 to 85    
0WAFERSALE
14SOIC
8PDIP
8SOIC    
20LCCC
8CDIP    
14SOIC
20PLCC
8PDIP
8SOIC    

Other qualified versions of UC3843A

Version Part Number Definition
Military UC1843A QML certified for Military and Defense Applications
Enhanced Product UC1843A-EP Supports Defense, Aerospace and Medical Applications
Space UC1843A-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application
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