有人用PSPICE做成功过UC3842的仿真吗

我单独调试UC3842时波形一切正常,一加到主电路上给MOS管送PWM,回馈比较电压时,PSPICE就提示收敛问题,随便换什么开关管也不行,很郁闷.有人做成过吗?贴张图看看啊

ERROR -- Convergence problem in transient bias point calculation
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/56/1903011186738621.bmp');}" onmousewheel="return imgzoom(this);">