UC2823B

Features:

 Improved Versions of the UC3823/UC3825PWMs
 Compatible with Voltage-Mode or Current-Mode Control Methods
  Practical Operation at Switching Frequencies to 1 MHz
  50-ns Propagation Delay to Output
  High-Current Dual Totem Pole Outputs (2-A Peak)
  Trimmed Oscillator Discharge Current
  Low 100-µA Startup Current
  Pulse-by-Pulse Current Limiting Comparator
  Latched Overcurrent Comparator With Full Cycle Restart


Pinout




Specifications




Description

The UC3823A and UC3823B and the UC3825A and UC3825B family of PWM controllers are improved versions of the standard UC3823 and UC3825 family. Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12 MHz, while input offset voltage is 2 mV. Current limit threshold is assured to a tolerance of 5%. Oscillator discharge current is specified at 10 mA for accurate dead time control. Frequencyaccuracy is improved to 6%.Startup supply current, typically 100 µA, is ideal for off-line applications. The output drivers are redesigned to actively sink current during UVLO at no expense to the startup current specification. In addition each output is capable of 2-A peak currents during transitions.