器件名称: UC1825
功能描述: High Speed PWM Controller
文件大小: 914.55KB 共17页
简 介:application INFO available
UC1825 UC2825 UC3825
High Speed PWM Controller
FEATURES
Compatible with Voltage or Current Mode Topologies
DESCRIPTION
The UC1825 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators Practical Operation Switching Frequencies and logic circuitry while maximizing bandwidth and slew rate of the to 1MHz error amplifier. This controller is designed for use in either cur50ns Propagation Delay to Output rent-mode or voltage mode systems with the capability for input voltage feed-forward. High Current Dual Totem Pole Outputs (1.5A Peak) Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port, and a soft start pin Wide Bandwidth Error Amplifier which will double as a maximum duty cycle clamp. The logic is fully Fully Latched Logic with Double Pulse latched to provide jitter free operation and prohibit multiple pulses at Suppression an output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outPulse-by-Pulse Current Limiting puts are high impedance. Soft Start / Max. Duty Cycle Control These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a Under-Voltage Lockout with Hysteresis power MOSFET. The on state is designed as……
