The document describes the UC3823A/B and UC3825A/B families of PWM controllers, which are improved versions of the standard UC3823 and UC3825. These devices support both voltage-mode and current-mode control methods with practical operation up to 1 MHz switching frequencies. Key features include a high-current dual totem pole output capable of 2-A peak currents, pulse-by-pulse current limiting, and latched overcurrent protection.
| Switching Frequency | to 1 MHz |
|---|---|
| Propagation Delay | 50 ns |
| Output Current (Peak) | 2 A |
| Error Amplifier Gain Bandwidth Product | 12 MHz |
| Input Offset Voltage | 2 mV |
| Current Limit Threshold Tolerance | 5% |
| Oscillator Discharge Current | 10 mA |
The 'B' versions have UVLO thresholds of 16 V and 10 V, intended for ease of use in off-line applications.
The UC3825A and UC3825B have dual alternating outputs with a duty cycle from zero to less than 100%.