UC3825AQG3

高速PWM控制器 HIGH-SPEED PWM CONTROLLER

DESCRIPON

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%.  scillator

discharge current is specified at 10 mA for accurate dead time control. Frequency accuracy 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.

FEATURES

Improved Versions of the UC3823/UC3825 PWMs

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