uc3825an

高速pwm 控制器

原裝現貨,最優,歡迎來電選購.

產品信息

特性

• improved versions of the uc3823/uc3825 pwms
• compatible with voltage-mode or current-mode control methods
• practical operation at switching frequencies to 1mhz
• 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

說明

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. 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.