IR IRS29751S 120W正负30V D类音放电源解决方案
IR 公司的IRS29751/2是自振荡半桥驱动器,其频率和死区时间能用两个外接元件编程,微功耗起动和超低静态电流,典型应用为LCD和PDP TV,通信和PC开关电源,家庭音响系统.本文介绍了IRS2795(1,2)主要特性,方框图,应用电路图以及D类音频放大器+/-30V 120W电源参考设计主要指标,主板和控制板电路图,材料清单,PCB布局图.
The IRS2795(1,2) is a self oscillating half-bridge driver IC for DC-DC resonant converter applications, especially the LLC resonant half-bridge converter. The frequency and dead time can be programmed externally using two external components. The IC offers over current protection using the on state resistance of the low-side MOSFET. The IC can be disabled by externally pulling the voltage at the CT/SD pin below its enable voltage threshold.
IRS2795(1,2)主要特性:
· Simple primary-side control solution for fixed and variable frequency DC-DC resonant converters.
· Max 500kHz per channel output with 50% duty cycle
· Floating channel bootstrap operation up to +600Vdc
· Programmable minimum and maximum switching frequency
· Programmable soft start frequency and soft start time
· Programmable dead time
· Micropower start-up & ultra low quiescent current
· Over-current protection using low side MOSFET Rds(on)
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