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2022-09-24 23:33:15
UC2825AN - High Speed PWM Controller
UC3823A and UC3823B UC3825AUC3825B is an improved version of the standard UC3823 and UC3825 family of PWM controllers. Several performance enhancing circuit blocks have been made. The gain-bandwidth product of the error amplifier is 12 MHz, while the input offset voltage is 2 mV. The current limit threshold is guaranteed to a 5% tolerance. Oscillator discharge current is specified for precise die time control of 10mA. Frequency accuracy improved to 6%. Start-up supply current, typically 100µA, is ideal for off-line applications. The output drivers are redesigned to actively sink current specifications without sacrificing current startup during UVLO. In addition, each output is capable of 2-A peak current during conversion.
Features
* Improved PWM version of UC3823/UC3825
* Compatible with voltage mode or current mode control methods
* Actual operation with switching frequency of 1 MHz
* 50 ns propagation delay to output
* High current dual totem pole outputs (2-A peak)
* Trim the discharge current of the oscillator
* Low 100-Wei start-up current
* Pulse through the pulse current limit comparator
* Latch restarts with full cycle overcurrent comparator