Current Mode PWM Controller - UC3843A

UC3843A (ACTIVE)

Current Mode PWM Controller

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
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
UC3843A UC1843A UC2843A
Boost
Buck
Flyback
Forward    
Boost
Flyback
Forward    
Boost
Flyback
Forward    
Current     Current     Current    
7.6     7.6     7.6    
30     30     30    
500     500     500    
8.4/7.6     8.4/7.6     8.4/7.6    
100     100     100    
1     1     1    
Error Amplifier     Error Amplifier     Error Amplifier    
Military     Military     Catalog    
0 to 70     -55 to 125     -40 to 85    
0WAFERSALE
14SOIC
8PDIP
8SOIC    
20LCCC
8CDIP    
14SOIC
20PLCC
8PDIP
8SOIC    
    0.50 | 1ku    

Other qualified versions of UC3843A

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